Effects of dietary rumen‐protected lysine on milk yield and composition in lactating cows fed diets containing double‐low rapeseed meal

Abstract

This study investigated the effects of dietary rumen‐protected lysine (RPLys) on milk yield and composition in lactating cows fed diets containing double‐low rapeseed meal. Twenty‐four cows were divided into three groups and fed one of three dietary treatments: 10% soya bean meal (SBM) diet (control), 15% double‐low rapeseed meal (DLRSM) diet and 15% DLRSM + 32 g/d RPLys (DLRSML) diet. The results showed that no differences (P > 0.05) were observed in milk yield, 4% fat correction milk (FCM), energy correction milk (ECM), protein yield, milk fat yield, milk fat, lactose yield and lactose between control and DLRSM. Supplementation with DLRSML increased (P < 0.05) milk yield, 4% FCM, ECM, and protein yield compared with the SBM. The results indicated that DLRSM and DLRSML might be used to substitute for SBM as a protein source in lactating cows, and the latter might be more beneficial to improve the performance.

Methionine, Lysine and Choline in Dairy Cows: a Review Article

“…Supplemental ruminally protected methionine did not increase milk production but did increase milk protein percentages in cows fed barley-based diets (Casper and Schingoethe, 1988). Supplementation of lysine in diet containing double-low rapeseed meal of lactating cows increased milk yield, 4% FCM and concluding that rumen protected lysine is beneficial for improving lactational performance of cows (Liu et al, 2016).…”