039 Comparison of the effects of reduced–crude protein, amino acid–supplemented diets on growth performance in swine

Five studies were conducted to determine the effects of reduced crude protein (CP) of commercial boilers fed for further processing. In experiments(EXP) 1, 2, and 3, birds were fed diets with up to 1.5% reduction in CP. The results were consistent for the three experiments. Performance and meat yield were not affected by the decrease in CP, but abdominal pat pad yield increased as CP decreased. In EXP3 and 4, birds were fed diets with up to 2.1% decrease in CP. To EXP4, the lowest CP-diet(CT-2.1%) received supplementation of arginine(Arg), valine(Val), isoleucine(Ile), leucine(Leu), or a mixture of these four amino acids(All). In EXP4, a decrease in breast meat yield was observed when CT-2.1% was fed whereas in EXP5 there was no effect on breast meat yield, which may have been due to the fewer replicates utilized for EXP2. In EXP4, carcass yield decreased and supplementation with Ile/All recovered carcass yield.

Download Full-text

Nitrogen metabolism and growth performance of gilts fed standard corn-soybean meal diets or low-crude protein, amino acid-supplemented diets1

Journal of Animal Science ◽

10.2527/2002.80112911x ◽

2002 ◽

Vol 80 (11) ◽

pp. 2911-2919 ◽

Cited By ~ 81

Author(s):

J. L. Figueroa ◽

A. J. Lewis ◽

P. S. Miller ◽

R. L. Fischer ◽

R. S. Gómez ◽

...

Keyword(s):

Amino Acid ◽

Growth Performance ◽

Nitrogen Metabolism ◽

Soybean Meal ◽

Crude Protein ◽

Protein Amino Acid

Download Full-text

Progress towards reduced-crude protein diets for broiler chickens and sustainable chicken-meat production

Journal of Animal Science and Biotechnology ◽

10.1186/s40104-021-00550-w ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Sonia Yun Liu ◽

Shemil P. Macelline ◽

Peter V. Chrystal ◽

Peter H. Selle

Keyword(s):

Amino Acids ◽

Amino Acid ◽

Broiler Chickens ◽

Crude Protein ◽

Plasma Concentrations ◽

Essential Amino Acids ◽

Chicken Meat ◽

Meat Production ◽

Accurate Identification ◽

Reduced Crude Protein

AbstractThe prime purpose of this review is to explore the pathways whereby progress towards reduced-crude protein (CP) diets and sustainable chicken-meat production may be best achieved. Reduced-CP broiler diets have the potential to attenuate environmental pollution from nitrogen and ammonia emissions; moreover, they have the capacity to diminish the global chicken-meat industry’s dependence on soybean meal to tangible extents. The variable impacts of reduced-CP broiler diets on apparent amino acid digestibility coefficients are addressed. The more accurate identification of amino acid requirements for broiler chickens offered reduced-CP diets is essential as this would diminish amino acid imbalances and the deamination of surplus amino acids. Deamination of amino acids increases the synthesis and excretion of uric acid for which there is a requirement for glycine, this emphasises the value of so-called “non-essential” amino acids. Starch digestive dynamics and their possible impact of glucose on pancreatic secretions of insulin are discussed, although the functions of insulin in avian species require clarification. Maize is probably a superior feed grain to wheat as the basis of reduced-CP diets; if so, the identification of the underlying reasons for this difference should be instructive. Moderating increases in starch concentrations and condensing dietary starch:protein ratios in reduced-CP diets may prove to be advantageous as expanding ratios appear to be aligned to inferior broiler performance. Threonine is specifically examined because elevated free threonine plasma concentrations in birds offered reduced-CP diets may be indicative of compromised performance. If progress in these directions can be realised, then the prospects of reduced-CP diets contributing to sustainable chicken-meat production are promising.

Download Full-text