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4. Effect of Metabolic Modifiers on Nutrient Requirements of Growing Ruminants
Pages 30-37

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From page 30...
... However, in ruminants, amino acids entering the small intestine come from rumen microbial protein, dietary protein that has escaped rumen fermentation, and endogenous secretions or contributions. Therefore, it is difficult to estimate both the quantity and profile of individual amino acids available for absorption from the small intestine of ruminants and the impact of amino acid nutriture on growth under normal management systems.
From page 31...
... Results from at least three studies (Eisemann et al., 1986a,b; Peters, 1986) indicate that ST treatment of cattle fed slightly above maintenance levels of energy intake results in conservation of body protein or amino acids to support increases in nitrogen retention or carcass lean accretion.
From page 32...
... bone have been observed, although heat production data do not support this. Increased efficiency of use of absorbed amino acids for protein gain may have been responsible for the significant increases in nitrogen retention or protein gain observer!
From page 33...
... These data suggest that feeding strategies that provide adequate quantity and balance of requirements are altered with ST treatment in growing amino acids may be needed to maximize the response to ST, lambs. Carcass protein accretion rate was increased 36 despise the apparentimproved efficiency with which amino percent in cross-bred ewe and wether lambs administered acids are used for protein deposition.
From page 34...
... Data from several studies suggest that the smaller protein accretion rate and nitrogen balance responses observed in ruminants administered ST or GRF, compared with responses in swine, are caused by constraints on quantity or balance of amino acids available at the site of absorption. However, ST or GRF administration in ruminants effectively increases the calculated biological value (gram of retained nitrogen
From page 35...
... Quantity and balance of amino acids exiting the rumen are not easily predicted or determined because of the alterations that occur cluring rumen fermentation. The magnitude of protein accretion rate and decrease in lipid accretion rate are also influenced by dietary energy levels, gender, age, and breed of cattle ant]
From page 36...
... Furthermore, visceral organ weights are not increased with p-agonists, suggesting that conservation of amino acids may occur and an altered pattern of dietary amino acids may be required for optimizing protein deposition with p-agonists as compared with ST or GRF. The question of whether pagonists improve efficiency of protein utilization for protein deposition in growing ruminants, as has been (lemonstrate(1 for ST and GRF, is unresolved.
From page 37...
... and adequate (lata are not available to (letermine whether nutrient requirements of growing ruminants administered anabolic steroids are different from those found in NRC publications. Published results suggest that enhancing amino acid availability andJor pattern of absorbed amino acids will improve protein deposition rates in growing cattle.


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