Do Brahman Cattle Need Less Protein Than Angus Cattle?

Do Brahman Cattle Need Less Protein Than Angus Cattle?

By Dr Duncan Houston

Brahman cattle are well known for maintaining themselves under hot conditions and on forage that would challenge many European breeds. That reputation has produced an appealing feeding shortcut: give Brahman-type cattle approximately 10% less protein.

The science is more nuanced.

Bos indicus cattle may handle low-quality forage and recycled nitrogen differently from Bos taurus cattle. However, that does not mean every Brahman cow, steer or crossbred calf has a protein requirement exactly 10% lower than an Angus animal of similar weight.

The real concern is whether dietary protein is genuinely being overfed. Cutting an existing surplus may save money and reduce nitrogen loss. Cutting protein when poor forage is already limiting rumen microbes can reduce forage intake, energy intake, growth and reproductive performance.

Quick Answer

Current evidence does not support reducing protein by 10% in every Brahman or Brahman-cross ration.

Brahman cattle may differ from Angus cattle in rumen microbial ecology, nitrogen recycling and their response to supplementation, especially on poor-quality forage. However, protein requirements must still be calculated from forage quality, dry-matter intake, body weight, growth target, pregnancy, lactation, energy supply and the balance between rumen-degradable and metabolizable protein. (OUP Academic)

Brahman Protein Requirements at a Glance

Question	Practical answer
Has a universal 10% lower protein requirement been proven?	No
Are breed differences biologically plausible?	Yes
Can Brahmans perform well on poorer forage?	Often, but this does not eliminate their nitrogen requirements
Do Brahmans still respond to protein supplements?	Yes, particularly when forage is severely protein-deficient
What determines protein need most?	Weight, intake, growth, pregnancy, lactation, forage quality and energy
When is supplementation commonly useful?	When forage crude protein falls below roughly 7% to 8%
Can excess protein be wasteful?	Yes, once microbial and animal requirements are met
Can too little protein reduce energy intake?	Yes, because rumen microbes cannot digest forage efficiently
Is crude protein percentage enough to formulate the diet?	No
Can urea simply replace natural protein?	Not safely or effectively in every forage system

The research supports accounting for Bos indicus biology within ration models. It does not support feeding cattle according to breed alone. (Texas A&M AgriLife Extension Service)

What Did the Texas A&M Research Actually Claim?

The original Texas A&M project was established to investigate whether Bos taurus indicus cattle use and recycle nitrogen differently from Bos taurus taurus cattle.

The public announcement stated that Brahman-type cattle may require less nitrogen and estimated that reducing protein overprovision by 10% could potentially reduce nitrogen excretion by approximately 22 lb per animal annually. The key word is overprovision. (Department of Animal Science)

That statement did not establish that:

• Every Brahman requires 10% less crude protein.

• Every Brahman-cross ration should be reduced by 10%.

• A 12% crude-protein ration should automatically become 10.8%.

• A protein supplement should always be reduced by 10%.

• Growing calves, cows and finishing steers should receive the same adjustment.

• The predicted 22 lb nitrogen reduction had already been demonstrated in a year-long commercial trial.

Based on the published material I could verify, the publicly available project results are primarily controlled metabolism studies and conference abstracts. These provide useful biological evidence, but they do not yet establish a universal breed-specific feeding table for commercial herds. (PubMed Central (PMC))

What Does “10% Less” Actually Mean?

Several very different feeding changes may all be described casually as “10% less protein.”

Possible interpretation	Example
10% less total dietary crude protein	Reducing a 12% ration to 10.8% CP
One percentage point less crude protein	Reducing a 12% ration to 11% CP
10% less protein supplement	Reducing 2 lb of supplement to 1.8 lb
10% less supplemental nitrogen	Reformulating the source or amount of nitrogen
Removing 10% overprovision	Bringing supply closer to calculated requirements

These are not nutritionally equivalent.

The Texas A&M estimate referred to reducing overfeeding, not withholding 10% of the animal’s actual requirement. (Department of Animal Science)

What Did the Brahman Experiments Find?

Brahmans Still Benefited From Protein on Very Poor Forage

In one Texas A&M study, five Brahman steers consumed King Ranch bluestem hay containing only 3.5% crude protein and 71% neutral detergent fibre.

Protein supplementation increased:

• Total digestible organic-matter intake

• Neutral detergent-fibre intake

• Digestible neutral detergent-fibre intake

• Overall organic-matter digestibility

The supplement containing 70% rumen-degradable protein increased forage organic-matter intake by approximately 19% to 20% compared with the unsupplemented basal diet. (OUP Academic)

This is the opposite of saying Brahmans do not need protein.

It shows that when forage is severely nitrogen-deficient, supplying ruminally available protein can improve how much forage Brahman cattle consume and utilise.

More Protein Improved Nitrogen Retention but Also Increased Waste

A related nitrogen-balance study used six Brahman steers consuming the same 3.5% crude-protein hay.

Without supplementation, nitrogen retention averaged approximately -19.1 g per day, meaning the steers were losing more nitrogen than they retained. High-level protein supplementation changed nitrogen retention to approximately +10 g per day. (OUP Academic)

However, increasing supplementation also increased nitrogen excretion.

Compared with the unsupplemented cattle:

• Faecal nitrogen increased with supplementation.

• Urinary nitrogen increased as both supplement level and degradability increased.

• The high, 70% rumen-degradable treatment increased urinary nitrogen by approximately 250%.

• The high, 35% rumen-degradable treatment increased urinary nitrogen by approximately 84%. (OUP Academic)

This demonstrates both sides of precision nutrition:

• Too little nitrogen: poorer intake, negative nitrogen balance and impaired performance.

• More nitrogen than can be retained efficiently: greater urinary and faecal nitrogen loss.

The correct answer lies between deficiency and excess. It is not automatically 10% below whatever the herd is currently receiving.

How Did Angus Cattle Respond?

Angus steers consuming the same extremely low-quality 3.5% crude-protein forage also responded strongly to protein supplementation.

In the Angus experiment:

• Protein increased forage intake.

• More rumen-degradable protein generally produced the greatest intake response.

• The 70% rumen-degradable supplement increased forage organic-matter intake by approximately 28% at the lower feeding level and 47% at the higher level.

• The lower-degradability supplement increased forage intake by approximately 23% and 28%. (PubMed Central (PMC))

The response was larger in the Angus trial than in the corresponding Brahman trial, which is consistent with the idea that Brahmans may maintain forage use somewhat better when nitrogen is scarce.

That is valuable biological information. It still does not prove that the Brahman requirement is exactly 10% lower across all diets and production stages.

What Do Direct Brahman and Angus Comparisons Show?

A 2018 study involving five Angus and five Brahman steers consuming 4.7% crude-protein rice straw reported that Bos indicus cattle are often better able to perform on low-quality diets, while Bos taurus cattle commonly show a greater response to protein supplementation.

The researchers identified several differences in rumen bacterial populations that may contribute to how the two subspecies utilise fibrous, protein-deficient forage. However, the biological mechanisms were not reduced to one fixed percentage difference in protein requirement. (OUP Academic)

Another direct study used five Brahman and five Angus steers consuming higher-quality bermudagrass hay containing 13.7% crude protein. It found no significant subspecies difference in forage organic-matter intake, total organic-matter intake or organic-matter digestion. Angus steers actually tended to consume more total digestible organic matter. (OUP Academic)

This is an important contrast:

Breed differences become most relevant under particular nutritional conditions. They do not create one permanent protein discount that applies to every ration.

Why Might Brahman Cattle Use Nitrogen Differently?

Several biological mechanisms may contribute.

Urea Recycling

When dietary protein is digested, some nitrogen is converted to ammonia and eventually urea.

Rather than losing all of that urea in urine, cattle can recycle part of it back into the digestive tract. Rumen microbes can then use the recycled nitrogen to produce microbial protein.

The Texas A&M project was designed partly to determine whether Brahman cattle recycle and utilise this nitrogen differently from Angus cattle, particularly when consuming low-quality forage. (Department of Animal Science)

Rumen Microbial Differences

Research has found differences in the relative abundance of several rumen bacterial groups between Brahman and Angus steers consuming low-quality rice straw.

These differences may help Brahman cattle maintain fibre digestion under nitrogen-limited conditions. However, the overall microbial response was complex and depended on diet and supplementation. (OUP Academic)

Adaptation to Tropical Forage Systems

Bos indicus cattle developed under production systems where heat, seasonal forage quality and fibrous tropical feeds commonly limit performance.

Selection for survival and reproductive efficiency under those conditions may favour animals that maintain function with less dietary nitrogen or utilise recycled nitrogen more effectively.

However, maintenance under poor forage is not the same as achieving maximum growth, milk production or reproductive performance. A cow can survive on a ration that is still economically inadequate.

What Does “Protein” Mean in a Cattle Ration?

Protein formulation is more complicated than reading one crude-protein number from a feed tag.

Crude Protein

Crude protein is calculated by measuring total nitrogen and multiplying it by 6.25.

It includes:

• True plant or animal protein

• Nonprotein nitrogen

• Urea

• Other nitrogen-containing compounds

Crude protein therefore estimates nitrogen supply. It does not directly measure amino-acid quality or how much protein reaches the animal’s tissues. (extension.okstate.edu)

Rumen-Degradable Protein

Rumen-degradable protein is broken down within the rumen and supplies nitrogen, peptides and amino acids to rumen microorganisms.

When cattle are consuming low-protein forage, this fraction is often the first priority because fibre-digesting microbes require nitrogen to grow and digest the forage. (Texas A&M AgriLife Extension Service)

Rumen-Undegradable Protein

Rumen-undegradable protein, also called escape or bypass protein, avoids extensive ruminal degradation and travels to the small intestine.

There, it may be digested and contribute amino acids directly to the animal. It becomes especially relevant when:

• Growth rates are high

• Milk production is high

• Microbial protein alone cannot meet the animal’s requirements

• The forage already provides abundant rumen-degradable nitrogen

(Texas A&M AgriLife Extension Service)

Metabolizable Protein

Metabolizable protein is the digestible protein reaching the small intestine from:

• Microbial protein

• Digestible rumen-undegradable dietary protein

This is closer to what the cow or steer actually has available for maintenance, growth, pregnancy and milk production.

A ration can have a respectable crude-protein percentage and still provide the wrong balance of rumen nitrogen, energy and metabolizable protein.

Why Must Protein and Energy Be Balanced?

Rumen microbes require both nitrogen and fermentable energy.

When nitrogen is deficient, microbes cannot digest fibre efficiently. Forage remains in the rumen longer, intake falls and the animal consumes less total energy.

When nitrogen supply greatly exceeds available fermentable energy, microbes cannot capture all the ammonia. More nitrogen is converted to urea and lost through urine. (Texas A&M AgriLife Extension Service)

That means a high-protein supplement is not automatically the best supplement.

The correct decision may be:

• More rumen-degradable protein

• More energy

• More bypass protein

• A combination

• No supplementation at all

The answer depends on the forage and the cattle.

When Is Protein Supplementation Most Likely To Help?

Protein supplementation is commonly useful when forage crude protein falls below approximately 7% to 8% of dry matter.

Below that range, forage intake often declines because rumen microbes do not receive enough nitrogen to maintain efficient fermentation. Adding protein can improve forage digestion, increase forage intake and increase the animal’s total energy intake. (Texas A&M AgriLife Extension Service)

This situation commonly occurs with:

• Dormant native pasture

• Mature tropical grasses

• Weathered standing forage

• Drought-stressed pasture

• Low-quality hay

• Crop residues

• Late-season warm-season grasses

However, 7% is a working threshold rather than a universal biological cliff. Intake responses have occurred at higher or lower forage-protein concentrations depending on cattle requirements, forage digestibility and the balance between available energy and nitrogen. (Texas A&M AgriLife Extension Service)

Cattle With Higher Protein Requirements

Protein reduction deserves additional caution in:

• Growing calves and stocker cattle

• Replacement heifers

• Late-gestation cows

• Early-lactation cows

• High-milking cows

• Bulls during development

• Cattle recovering from disease or prolonged undernutrition

Requirements change substantially with physiological stage.

For example, published requirement tables estimate that a 1,200 lb cow may require approximately 2.75 lb of crude protein per day during the second month after calving but only around 1.50 lb per day during the eighth month after calving. That change due to production stage is much larger than the proposed 10% breed adjustment. (Merck Veterinary Manual)

When Might Feeding Less Protein Make Sense?

Reducing supplemental protein may be reasonable when:

• Forage testing shows adequate crude protein.

• Rumen-degradable protein requirements are already met.

• Metabolizable protein requirements are met.

• Energy, rather than protein, is limiting performance.

• Mature cattle are at maintenance rather than growing or lactating.

• Current supplementation is producing no measurable performance benefit.

• Supplement intake is substantially above the formulated target.

• The ration was designed using a generic safety margin that no longer reflects the cattle.

• High-protein forage already supplies abundant degradable nitrogen.

Once rumen microbes and the animal have adequate protein, adding still more generally does not meaningfully improve productivity. It mainly increases cost and the amount of nitrogen requiring metabolism and excretion. (Merck Veterinary Manual)

The reduction should target a demonstrated surplus, not the animal’s calculated requirement.

How Much Protein Can You Safely Reduce?

There is no universal percentage.

The safe amount depends on:

• Forage dry-matter intake

• Forage crude protein

• Forage digestibility

• Rumen-degradable protein supply

• Rumen-undegradable protein supply

• Energy concentration

• Body weight

• Breed composition

• Average daily gain

• Pregnancy stage

• Milk production

• Body condition

• Weather and grazing conditions

The practical calculation begins with:

Forage protein intake = forage dry-matter intake × forage crude-protein fraction

Supplement protein intake = supplement dry-matter intake × supplement crude-protein fraction

Total crude-protein intake = forage protein intake + supplement protein intake

That amount must then be compared with the requirements of both:

1. The rumen microorganisms

2. The animal

Crude protein alone does not complete the ration because degradability and energy balance still matter. (Texas A&M AgriLife Extension Service)

Do Not Simply Reduce the Feed Bag by 10%

A 10% reduction in supplement weight may change:

• Protein

• Energy

• Minerals

• Vitamins

• Ionophore intake

• Medication intake

• Salt intake

• Total dry-matter intake

If the supplement also supplies essential minerals or an ionophore, reducing its quantity may create a different deficiency before it produces any protein saving.

Reformulation is safer than simply feeding less of a multipurpose supplement.

What To Do Right Now

1. Test the Forage

Request at least:

• Dry matter

• Crude protein

• Neutral detergent fibre

• Acid detergent fibre

• Total digestible nutrients or another energy estimate

• Major minerals

Add nitrate testing when drought, frost or heavy nitrogen fertilisation creates a risk.

Crude protein cannot be interpreted properly without forage intake and energy. High neutral detergent fibre may limit how much forage cattle can physically consume, even when the crude-protein percentage looks acceptable. (extension.okstate.edu)

2. Identify the Cattle Class

Separate requirements for:

• Dry mature cows

• Late-gestation cows

• Lactating cows

• First-calf heifers

• Replacement heifers

• Growing steers

• Finishing cattle

• Bulls

Do not use the lowest-maintenance group to set the ration for the entire herd.

3. Record Brahman Influence

Record whether cattle are:

• Purebred Brahman

• High-percentage Brahman

• Brangus

• Braford

• Santa Gertrudis

• Low-percentage Bos indicus crosses

• Predominantly Bos taurus

The controlled Texas A&M experiments used Brahman steers. Their findings cannot be assumed to transfer linearly to every animal with a small proportion of Brahman ancestry.

4. Estimate Actual Intake

A forage analysis tells you the nutrient concentration of the sample.

It does not tell you how much the cow eats.

Intake can fall because of:

• Low forage protein

• High fibre

• Limited forage availability

• Heat

• Water restriction

• Disease

• Social competition

• Poor palatability

Protein concentration and pounds of protein consumed are different questions.

5. Formulate for Rumen and Animal Needs

The ration should provide:

• Enough rumen-degradable protein for microbial fermentation

• Enough energy to capture that nitrogen

• Enough metabolizable protein for growth, pregnancy or lactation

• Appropriate minerals and vitamins

Low-quality forage generally makes rumen-degradable protein the first priority. High-quality, protein-rich forage may instead require energy or additional bypass protein. (Texas A&M AgriLife Extension Service)

6. Make One Controlled Change

Do not change the forage, protein source, feeding rate, mineral and cattle group simultaneously.

Make one calculated adjustment so the response can be interpreted.

7. Monitor Performance

For growing cattle, monitor:

• Body weight

• Average daily gain

• Feed or supplement intake

• Forage disappearance

• Health events

• Feed conversion where measurable

For breeding cows, monitor:

• Body-condition score

• Weight trend

• Milk production indirectly through calf growth

• Pregnancy rate

• Calving interval

• Calf weaning weight

• Supplement consumption

Allow enough time for meaningful performance data, but do not wait for obvious emaciation before reversing an unsuccessful ration change.

8. Review the Economics

Calculate:

• Cost per pound of supplement

• Cost per pound of actual crude protein

• Cost per pound of rumen-degradable protein where known

• Cost per animal per day

• Cost per additional pound of gain

• Change in cow condition or calf weaning weight

The cheapest supplement is not economical when it fails to correct the limiting nutrient.

How Worried Should You Be About Reducing Protein?

Lower Risk

The cattle are:

• Mature

• Non-lactating

• Maintaining good body condition

• Consuming tested forage that meets microbial and animal requirements

• Receiving a supplement known to provide a substantial surplus

Action: A nutritionist-directed reduction may be reasonable. Monitor intake and body condition.

Moderate Risk

The cattle are:

• Brahman-cross rather than pure Brahman

• Near the 7% to 8% forage-protein threshold

• Consuming forage of uncertain intake

• Entering late gestation

• Experiencing changing pasture conditions

Action: Test the forage and calculate the ration before reducing supplementation.

High Risk

The cattle are:

• Growing

• Lactating

• Losing weight

• Declining in body condition

• Consuming dormant or drought-stressed forage

• Eating forage below approximately 7% crude protein

• Showing reduced forage intake

• Approaching breeding or calving

Action: Do not cut protein based on breed alone. Investigate and correct the nutritional deficit.

Critical Risk

Cattle develop sudden signs after the ration is reformulated with urea or another nonprotein nitrogen source.

Possible signs include:

• Facial or ear tremors

• Abdominal pain

• Frothy salivation

• Teeth grinding

• Bloat

• Rapid breathing

• Incoordination

• Aggression

• Seizures

• Collapse

Action: Treat this as suspected ammonia toxicosis and contact the veterinarian immediately. (Merck Veterinary Manual)

What Else Can Cause Poor Performance After Protein Is Reduced?

Reduced growth or body condition does not automatically prove that crude protein was the only problem.

Possible problem	What may be happening
Inadequate forage quantity	Cattle cannot eat enough total dry matter
Low forage energy	Protein is adequate but usable energy remains limiting
Excessive fibre	Physical fill limits intake
Internal parasites	Nutrients are lost or intake declines
Mineral deficiency	Metabolism, immunity or fertility may be affected
Heat stress	Grazing and feed intake decline
Poor water access	Intake and rumen function fall
Dental disease	Older cows cannot harvest or chew forage properly
Respiratory or systemic disease	Growth and appetite decline
Social competition	Subordinate cattle receive less supplement
Incorrect supplement intake	Free-choice consumption differs substantially between animals

The mistake I see most often is blaming protein when the herd is short of forage or energy. Protein supplementation can increase forage intake, but it cannot create grass that is no longer in the paddock. (Texas A&M AgriLife Extension Service)

When Is This an Emergency?

A modest protein deficiency usually causes gradual changes rather than sudden collapse.

An acute emergency after a feeding change raises concern for:

• Urea or nonprotein nitrogen toxicosis

• Grain overload

• Nitrate poisoning

• Cyanide poisoning

• Ionophore mixing error

• Major feed contamination

Urea and Ammonia Toxicosis

Clinical signs of nonprotein nitrogen poisoning usually begin approximately 20 to 60 minutes after ingestion in cattle.

Signs may progress from facial tremors and abdominal discomfort to frothy salivation, bloat, breathing difficulty, violent struggling, seizures and death. Death may occur within approximately two hours. (Merck Veterinary Manual)

What To Do

1. Remove access to the suspected feed immediately.

2. Contact the veterinarian and specifically report suspected urea or ammonia poisoning.

3. Keep affected animals as quiet as possible.

4. Do not chase, load or force oral treatment into seizuring or recumbent cattle.

5. Preserve feed, supplement and water samples.

6. Prevent the remainder of the herd from accessing the batch.

Veterinary treatment may include ruminal acidification with acetic acid, cold-water administration and supportive fluid and seizure treatment. Because cattle may become violent and deteriorate rapidly, this is not a sensible treatment to improvise from an article beside the feed bunk. (Merck Veterinary Manual)

Is Urea a Safe Way To Reduce Feed Costs?

Urea can supply nitrogen to properly adapted adult ruminants when sufficient fermentable carbohydrate is available.

It does not supply:

• Intact amino acids

• Bypass protein

• Peptides

• The complete metabolizable-protein needs of high-performing cattle

Low-quality roughages may not provide enough fermentable energy for efficient conversion of urea-derived ammonia into microbial protein. Urea is therefore not automatically an effective substitute for natural protein in cattle consuming poor forage. (Merck Veterinary Manual)

Urea becomes particularly dangerous when:

• Cattle are hungry.

• Mixing is uneven.

• Supplement intake is unrestricted.

• Animals have not been adapted.

• The ration is low in fermentable energy.

• Urea is combined with raw soybeans.

• Liquid feeders leak or allow overconsumption.

• Young calves without a developed rumen gain access.

(Merck Veterinary Manual)

Any urea-containing ration should be formulated and mixed professionally.

Common Brahman Protein-Feeding Mistakes

Treating 10% as a Proven Breed Rule

The research identified a question and potential efficiency opportunity. It did not produce a universal instruction to cut every Brahman ration by 10%.

Confusing Nitrogen With Complete Protein

Urea supplies nitrogen but does not provide the same nutritional value as a balanced natural protein source.

Looking Only at Crude Protein

Crude protein does not reveal energy balance, degradability, intake or metabolizable-protein supply.

Ignoring Forage Intake

A pasture containing 8% crude protein provides no useful protein when drought or overstocking prevents the cow from eating enough of it.

Reducing Protein During Early Lactation

This is one of the highest-demand stages for a beef cow. A change that works for a dry mature cow may fail badly in a high-milking lactating cow.

Using One Ration for Every Animal

Cows, calves, bulls and growing stockers have very different requirements.

Replacing Natural Protein With Urea Too Aggressively

This may reduce performance on low-quality forage and can create a rapidly fatal toxicity risk.

Reducing a Complete Supplement Without Recalculating Everything Else

The supplement may also be delivering minerals, vitamins, energy or an ionophore.

Assuming Survival Means the Ration Is Adequate

Brahman cattle may maintain themselves impressively under difficult conditions. That does not mean the ration is optimising pregnancy rate, calf growth or profitability.

How Can a Precision Protein Programme Be Built?

Test Forage Seasonally

Forage quality changes with:

• Maturity

• Rainfall

• Drought

• Frost

• Fertiliser

• Grazing pressure

• Storage

• Pasture species

A ration based on wet-season forage may be completely wrong during the dry season.

Phase-Feed the Herd

Use different supplements or feeding rates for:

• Dry cows

• Late-gestation cows

• Lactating cows

• First-calf heifers

• Growing cattle

• Bulls

Phase feeding is usually more valuable than applying one breed adjustment across the whole property.

Separate High-Risk Groups

Young, thin, lactating or high-performing cattle should not compete with mature maintenance cows for one free-choice supplement.

Record Supplement Intake

For free-choice products, calculate:

Supplement used ÷ animal numbers ÷ days offered

Average disappearance does not prove that every animal ate the target amount, but it quickly identifies major overconsumption or underconsumption.

Use Performance To Validate the Ration

The ration is working when the cattle achieve the intended:

• Body-condition score

• Average daily gain

• Pregnancy rate

• Calving interval

• Calf growth

• Health outcome

A lower feed bill is not a saving when weaning weights or conception rates fall with it.

Frequently Asked Questions

Do Brahman cattle need exactly 10% less protein?

No. The 10% figure was presented as a potential reduction in protein overprovision, not a proven universal breed requirement. Rations should be formulated for the cattle, forage and production stage. (Department of Animal Science)

Can Brahman cattle survive on lower-quality forage than Angus cattle?

Brahman cattle often cope well with low-quality forage, and research has identified rumen microbial differences that may contribute. However, Brahmans still respond to protein supplementation when forage is severely protein-deficient. (OUP Academic)

At what forage protein level should cattle be supplemented?

Protein supplementation commonly improves forage intake and digestion when forage crude protein falls below approximately 7% to 8%. The exact response varies with forage digestibility, cattle requirements and available energy. (Texas A&M AgriLife Extension Service)

Can urea replace soybean meal or cottonseed meal?

Not automatically. Urea supplies rumen nitrogen but no bypass protein or intact amino acids. It also requires sufficient fermentable energy and careful adaptation and mixing. (Merck Veterinary Manual)

How will I know whether reducing protein worked?

Monitor forage and supplement intake, body-condition score, average daily gain, reproductive performance and calf growth. If cattle lose condition, reduce intake or fail to meet performance targets, reassess the entire ration rather than assuming the breed adjustment was correct.

Final Thoughts

Brahman cattle may use low-quality forage and recycled nitrogen differently from Angus cattle, but the available evidence does not justify a blanket 10% protein reduction.

The most important points are:

1. The Texas A&M figure referred to reducing protein overprovision.

2. It was not a universal breed-specific feeding instruction.

3. Brahman steers still benefited from protein supplementation on 3.5% crude-protein forage.

4. Without supplementation, those steers were in negative nitrogen balance.

5. Increasing protein improved nitrogen retention.

6. Increasing protein also increased urinary and faecal nitrogen losses.

7. Brahman and Angus differences depend on the quality of the basal diet.

8. Crude protein alone does not describe the full protein supply.

9. Rumen-degradable protein, bypass protein, metabolizable protein and energy must all be considered.

10. Protein supplementation is commonly useful below approximately 7% to 8% forage crude protein.

11. Growing and lactating cattle deserve more caution than mature maintenance cows.

12. Reduce only a demonstrated surplus, not the calculated requirement.

13. Do not use urea as a casual replacement for natural protein.

14. Feed testing and performance records should guide the final ration.

15. Precision feeding means providing enough protein without paying cattle to convert the excess into expensive urine.

The safest conclusion is not that Brahmans need less protein. It is that Brahman cattle may need a more accurate breed-aware model of protein supply than the generic models traditionally used across all beef cattle.

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ASK A VET™ can help organise forage analyses, supplement labels, body weights, production stages and performance records while producers work directly with a ruminant nutritionist and attending herd veterinarian. Sudden tremors, frothy salivation, bloat, breathing difficulty, incoordination or collapse after a ration change still require immediate hands-on veterinary treatment.