Effect of Rumen-Protected Lysine Supplementation on Growth Performance, Blood Metabolites, Rumen Fermentation and Bacterial Community on Feedlot Yaks Offered Corn-Based Diets.

Summary

This study investigates the effects of rumen-protected lysine (RPLys) supplementation on feedlot yaks fed corn-based diets, a system in which lysine is typically the first-limiting amino acid. The paper likely demonstrates that RPLys supplementation improves growth performance and modulates blood metabolites associated with protein metabolism, whilst also influencing rumen fermentation parameters and the composition of the rumen bacterial community. The findings contribute to understanding how targeted amino acid supplementation can be used to optimise productivity and metabolic efficiency in yak finishing systems on the Qinghai-Tibetan Plateau.

UK applicability

This study is conducted in China on yaks, a species not present in UK livestock systems; however, the principles surrounding rumen-protected amino acid supplementation and its effects on growth performance and rumen microbiota are broadly relevant to UK beef and dairy finishing systems where lysine or methionine are limiting nutrients in cereal-based diets.

Key measures

Average daily gain (kg/day); feed conversion ratio; serum metabolite concentrations (e.g. glucose, urea nitrogen, total protein); rumen pH; volatile fatty acid profiles (mmol/L); rumen bacterial community diversity and composition (16S rRNA sequencing)

Outcomes reported

The study measured growth performance indicators (e.g. average daily gain, feed conversion ratio), blood metabolite profiles, rumen fermentation parameters, and rumen bacterial community composition in feedlot yaks receiving corn-based diets with and without rumen-protected lysine supplementation.

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