Effects of dietary supplementation of methionine and lysine on milk production and nitrogen utilization in dairy cows

Journal of Dairy Science
C WangH W Ye

Abstract

The effect of the content of lysine and methionine in metabolizable protein (MP) on lactation performance and N utilization in Chinese Holstein cows was determined. A control diet (C) was formulated to be adequate in energy but slightly limiting in MP. The concentration of Met and Lys in MP was 1.87 and 5.93%, respectively. The treatments were as follows (% of Met or Lys in MP): L=diet C supplemented with L-lysine-HCl at 0.49% on a dry matter (DM) basis (Met, 1.87; Lys, 7.00); M=diet C supplemented with 2-hydroxy-4-(methylthio)-butanoic acid (HMB) at 0.15% (Met, 2.35; Lys, 5.93); ML=diet C supplemented with 0.49% L-lysine HCl and 0.15% HMB (Met, 2.39; Lys, 7.10). The diets were fed to 60 Chinese Holsteins in mid-lactation (average days in milk=120, and milk yield=32.0 kg/d) for 8 wk. Milk yield was increased by supplementation of either Lys (1.5 kg/d) or Met (2.0 kg/d), and supplementation of both Lys and Met further increased milk yield (3.8 kg/d). There was no significant difference in dry matter intake across treatment groups. Cows on treatments M (3.95%) and ML (3.90%) had higher milk fat content than those on C (3.60%) and L (3.67%), but there were no significant differences in milk protein and lactose contents or somatic ...Continue Reading

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Citations

Mar 29, 2016·Journal of Proteomics·Lorenzo E Hernández-CastellanoAndre M de Almeida
Sep 17, 2013·Journal of Dairy Science·H N PhuongP Schmidely
Jul 31, 2018·Asian-Australasian Journal of Animal Sciences·Tae-Il KimVijayakumar Mayakrishnan
Dec 16, 2019·Journal of Dairy Science·Alex BachMaria Vidal
Dec 22, 2019·Animals : an Open Access Journal From MDPI·Chong WangHuiling Mao
Mar 11, 2019·Journal of Dairy Science·A J FlemingM D Hanigan
May 6, 2021·Comprehensive Reviews in Food Science and Food Safety·Jonathan B MaganNoel A McCarthy
Oct 11, 2019·Journal of Agricultural and Food Chemistry·Wenting DaiHongyun Liu

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