Jeffrey Salazar
Beef cattle require a variety of nutrients to survive and be productive, including water, energy, protein, minerals, and vitamins. The specific amount of each nutrient required depends on the cattle's physiological state and performance level. For example, the nutritional requirements for growing and finishing animals differ from those of breeding animals. In addition, factors such as the stage of lactation or pregnancy, animal weight, rate of gain, and previous diet can also influence the nutritional requirements of cattle. While the amount of protein in the diet is important, it is also crucial to consider the quality and availability of other nutrients to ensure optimal health and productivity in beef cattle.
| Characteristics | Values |
|---|---|
| Protein requirement | Varies depending on the cattle's age, weight, and physiological state. |
| Protein sources | Bacteria in the rumen, cottonseed meal, feather meal, urea, and natural protein. |
| Crude protein (CP) | Calculated using the nitrogen (N) concentration x 6.25, assuming the average N concentration of a protein molecule is 16%. |
| Protein supplementation | Infrequent protein supplementation can help reduce costs without impairing animal growth performance, forage intake, BCS, or ruminal parameters. |
| Hay protein content | Should be 8% crude protein or higher. |
| Calves' creep feed | Should contain at least 15% crude protein. |
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What You'll Learn
The importance of protein in a beef cattle diet
Protein is an essential component of a beef cattle diet. It is required for vital bodily and productive functions, and a deficiency can lead to impaired growth, milk production, and health. The specific amount of protein required depends on the cattle's physiological state and performance level. For example, the protein requirements for growing and finishing animals differ from those of breeding animals. Similarly, the stage of lactation or pregnancy, animal weight, and rate of gain also determine the optimal amount of protein in the diet.
Beef cattle obtain protein from various sources, including their natural diet of grass and hay. The amount of forage consumed directly impacts their performance, typically expressed in average daily gain (ADG). Growing beef cattle consume approximately 2.5% of their body weight in forage each day, depending on forage conditions. To ensure adequate protein intake, the hay should ideally contain at least 8% crude protein.
The bacteria present in the rumen, the first of a cow's four stomach compartments, also play a crucial role in protein supply. These bacteria break down the fibre in the feed and provide the cow with the protein they need. When feeding a cow, we are essentially feeding the bacteria so they can fulfil their role effectively. Additionally, urea is sometimes added to the diet of larger, older cattle to provide a source of nitrogen, which the bacteria use to synthesise protein. However, it is important to introduce urea gradually and not feed it to calves under 400 pounds or 120 days of age.
Supplementation is often necessary to ensure beef cattle receive sufficient protein, especially when their natural diet consists of low-quality forages. Protein supplementation can account for a significant proportion of feed costs, so strategies such as infrequent supplementation and proper utilisation of non-protein nitrogen (NPN) sources are employed to manage expenses. By understanding the unique nutritional requirements of beef cattle and implementing cost-effective strategies, producers can optimise the health and productivity of their herds.
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Natural protein sources vs. urea
The protein requirements of beef cattle vary depending on their age and weight. Nursing calves should be fed a diet containing at least 15% crude protein, while growing cattle over 700 pounds will need to receive rations relatively high in concentrates to gain faster. For forage-based diets, additional protein and energy are often required to properly balance diets for growing cattle and lactating beef cows.
Protein supplementation often accounts for a large proportion of supplemental feed costs. Natural protein sources for beef cattle include grass and hay. On a dry matter basis, a cow will eat 4 to 5 tons of forage per year. When cattle are on grass, the amount of forage consumed will determine their performance, usually expressed in average daily gain (ADG).
Urea, a non-protein nitrogen compound, can be used as an economical replacement for a part of the protein in beef cattle diets. It is a cost-effective way to supplement protein and provides a competitive advantage beyond the reach of other livestock species. Urea is particularly useful when forage availability is abundant. However, it should be noted that urea contains no other useful feed components such as energy, minerals, or vitamins, so its use should be properly managed. Cattle should be managed on feed for a few days before adding urea to their diet, and it should not be fed to newly received cattle that have been off feed for a few days. The recommended amount is no more than 0.25 pounds of urea per day or one percent of the diet.
While urea is a viable option for protein supplementation in beef cattle diets, natural protein sources such as grass and hay are still necessary to provide a balanced diet and ensure adequate energy intake.
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How to calculate protein requirements
Protein is a critical nutrient in all beef cattle diets. The amount of protein required varies depending on the age, stage of production, sex, breed, environmental conditions, and basal diet quality and amount. For example, nursing calves should be fed a diet containing at least 15% crude protein, while growing beef cattle will consume approximately 2.5% of their body weight each day, and steer calves gaining 2 pounds per day may require 1.6 pounds of protein per day.
To calculate the protein requirements for beef cattle, it is important to first understand the concept of crude protein. Crude protein is the sum of undegradable intake protein (UIP) and degradable intake protein (DIP). UIP, also known as ruminally undegradable protein (RUP), is the protein that is not broken down in the rumen but may be degraded in the small intestine. DIP, also known as ruminally degradable protein (RDP), is the protein that is broken down in the rumen.
The crude protein content of a forage or feedstuff can be determined by measuring the nitrogen content of the feed and then multiplying this value by 6.25. This is because proteins typically contain 16% nitrogen. For example, if a feedstuff has a nitrogen content of 2%, the crude protein content would be 12.5% (2 x 6.25 = 12.5).
When calculating the protein requirements for beef cattle, it is important to consider the quality of the diet. For example, if cattle are consuming low-quality forage or hay, a lower RDP requirement can be used (10% of total digestible nutrients intake). On the other hand, if they are consuming high-quality forage or a ration with at least 50% concentrate, a higher RDP requirement is necessary (13% of total digestible nutrients intake).
Additionally, the expected intake of the cattle should be considered. The necessary concentration of protein in the diet will depend on the amount of feed the animal is expected to consume. For example, if a steer calf is expected to consume 15 pounds of dry matter (DM) daily and gain 2 pounds per day, the protein requirement would be 1.6 pounds of protein per day, or 10.7% of DM intake.
It is also important to note that while protein is essential for the health and productivity of beef cattle, energy is often the limiting nutrient in meeting their requirements. This is particularly true for lactating cattle, as supplemental energy sources may be needed to support milk production.
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The role of bacteria in protein digestion
Beef cattle require a diet that is high in protein. Creep feeds or forages for nursing calves should contain at least 15% crude protein, while hay should be 8% crude protein or higher.
Cows are ruminants, meaning they ferment their feed before digesting it in the stomach and intestines. The rumen in a mature cow contains feed, water, and billions of bacteria. The bacteria play a crucial role in protein digestion. They break down the fiber and help the cow derive energy from it. The bacteria will provide a significant proportion of the protein that the cow needs.
The rumen microbes also digest simple and complex carbohydrates (fiber) and convert them into volatile fatty acids (VFAs). VFAs mainly consist of acetic, propionic, and butyric acids and provide 50 to 70% of the cow's energy. The microbes also digest about 30 to 50% of the fiber units, cellulose, and hemicellulose in the rumen. Additionally, they produce vitamin K and all B vitamins, ensuring sufficient amounts for cattle growth and maintenance.
The small intestine also contains microbial communities that play a key role in energy production and nutrient supply. Some microorganisms in the small intestine have been found to play a role in amino acid metabolism, nutrient digestion, and absorption.
Overall, the bacteria in the rumen and small intestine of beef cattle are essential for protein digestion and energy production, contributing significantly to the cow's nutritional requirements.
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Strategies to reduce supplementation costs
The protein content of a beef cow's diet depends on factors such as the cow's age, weight, and forage conditions. While forage is the most economical source of protein, supplemental feeding is often necessary to meet nutrient requirements. Here are some strategies to reduce the costs of protein supplementation:
Understand Forage Quality and Requirements
Before supplementing, it's important to understand the quality of the forage and the specific protein requirements of the cattle. The availability and chemical composition of forage should be the first factors to consider when developing a range nutrition program. Testing the protein value of hay through local laboratories can help determine if supplementation is necessary. Additionally, monitoring cattle weight and Body Condition Score (BCS) changes can help identify if adjustments to supplementation levels are needed to meet performance goals.
Choose Cost-Effective Supplements
When selecting supplements, consider the cost per pound of protein rather than the price per pound of the supplement. Compare the costs of different supplements, such as soybean hulls, wheat middlings, and citrus pulp, which have been shown to provide better performance per unit of supplemental TDN. Additionally, anhydrous ammonia treatment of low-quality hay can improve its quality and reduce the need for supplements.
Infrequent Feeding of Protein Supplements
Research has shown that decreasing the frequency of protein supplement delivery can lead to similar animal performance as daily feeding while reducing costs. This is due to the ruminant animal's ability to recycle nitrogen. For example, in a study at Oregon State University, cows maintained on a low-quality hay diet were supplemented with soybean meal at different intervals, and all groups gained the same amount of body condition despite the varying frequencies of supplementation.
Natural Protein for Young Cattle
For young cattle, it is recommended to use natural protein sources such as forage instead of protein supplements. The bacteria in the rumen provide a significant amount of the protein that young cattle need. By feeding the bacteria, you ensure they can break down the fiber and help the cow derive energy from it.
Combination of Protein and Energy Supplements
In some cases, a combination of protein and energy supplements may be more cost-effective than protein supplements alone. However, it is important to consider the starch content of energy supplements as high-starch supplements can suppress forage intake and digestion.
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Frequently asked questions
The specific amount of protein required in a beef cattle diet depends on the animal's physiological state and performance level. For instance, growing and finishing animals require different nutrients compared with breeding animals. The beef cattle diet should also be adjusted according to the stage of lactation or pregnancy, animal weight, rate of gain, and previous diet.
Protein is an essential component of a beef cattle diet as it supplies ruminal bacteria with a source of nitrogen, which they use to make their own protein. It also provides cattle with amino acids, which are used to build and repair proteins in the body. Therefore, a protein deficiency may impair normal maintenance, growth, reproduction, and immune processes.
Good sources of protein for beef cattle include cottonseed meal, feather meal, and urea. Cottonseed meal and feather meal are natural protein sources, while urea is a non-protein nitrogen (NPN) source. It is important to note that replacing natural protein sources with urea can negatively affect average daily gains (ADG) and pregnancy rates.
The amount of protein in a beef cattle diet can be calculated as a percentage of dry matter (DM) intake. Crude protein (CP) concentration in feedstuffs can be estimated using the formula: Nitrogen (N) concentration x 6.25. This assumes that the average N concentration of a protein molecule is 16%.
