生长育肥肉羊氮利用效率及其调控技术的研究进展OA

The meat sheep industry is facing the dual challenges of high-quality protein feed shortage and low nitrogen utilization efficiency driven by the increasing demand for high-quality animal protein.A multidimensional characterization system,key influencing factors,and frontier regulation technologies of NUE in growing-finishing meat sheep are systematically reviewed.The influences of breed genetic background,degradation characteristics of main protein ingredients,and intestinal amino acid balance on the nitrogen metabolism network are deeply analyzed.Closely combined with production practice,the crossbreeding of specialized meat breeds,targeted processing of miscellaneous meals,and comprehensive application of slow-release and synchronous technologies of non-protein nitrogen are emphatically discussed.These regulation strategies show great potential in optimizing ruminal energy-nitrogen synchronization,promoting microbial protein synthesis,and reducing environmental nitrogen excretion.Future research should further focus on multi-nutrient synergy and the"host-microbiome-nutrition"interaction mechanism to provide theoretical support for constructing an efficient,nitrogen-reducing,and environmentally friendly precision nutrition system for meat sheep.