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Metabolic Modifiers: Effects on the Nutrient Requirements of Food-Producing Animals
Metabolic Modifiers Subcommittee on Effects on the Nutrient Requirements of Food-Producing Animals,
by National Research Council
Edition: 1st., 1994
In this report, we have discussed the current understanding of the mechanisms by which metabolic modifiers alter
nutrient partitioning and productive efficiency and what is known about their effects on the nutrient requirements of food-
producing animals. In Chapter 1, the subcommittee underscores the role agricultural scientists play to provide optimal
nutrition and productive efficiency for food-producing animals to meet the changing needs of consumers and the increasing
demands of a growing world population. Chapter 2 addresses our growing knowledge of biology, chemistry, and mechanisms
of action of metabolic modifiers that make it possible to alter carcass composition, improve feed efficiency, and enhance
growth rate in poultry, sheep, pigs, and cattle, and increase milk yield in dairy cattle. Chapter 3 examines the nutrient
requirements and production responses of dairy cattle supplemented with bovine ST (bST) with respect to the yield and
composition of milk in relation to breed and genotype, parity, management, environment, and feed intake. Chapter 4
addresses nutritional implications in swine, including constraints to lean growth, and nutrient requirements with respect to
intake, digestion, maintenance, and efficiency of nutrient use. Discussion includes estimates of amino acid, mineral, and
vitamin requirements in growing swine. In Chapter 5, strategies for administering metabolic modifiers to poultry are
discussed, including exogenous ST administration and in ovo manipulations. Nutrient intake recommendations are given
along with modeling approaches and empirical predictions. Chapter 6 discusses the effects of metabolic modifiers on growing cattle and growing lambs.
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