过瘤胃氨基酸在肉羊生产中的应用研究进展OA

Ruminants underpin the global supply of meat,milk and fibre,and their production efficiency largely determines resource-use efficiency and the sustainability of agriculture.However,ruminants utilise dietary protein poorly,leading to resource waste and environmental pollution.Recent advances in ruminant nutrition have focused on low-protein diets,yet such diets often exacerbate deficiencies in limiting amino acids(e.g.,methionine and lysine)and consequently impair growth,development and production performance.To solve this problem,rumen-protected technology has been developed.Physical,chemical or biological treatments protect the amino acids from ruminal degradation and ensure high post-ruminal availability,thereby increasing the supply of limiting amino acids to the small intestine.Numerous studies have shown that supplementing low-protein diets with rumen-protected amino acids(RPAA)improves apparent nutrient digestibility,small-intestinal amino acid absorption,nitrogen utilisation,growth performance and feed-protein savings.This paper reviews recent national and international findings on protein metabolism,the formation of limiting amino acids,rumen-protected technology,RPAA products and their bioavailability in ruminants,and summarises the application of RPAA in mutton sheep,with the aim of guiding future low-protein diet formulation for the Chinese mutton sheep industry.