Effect of chromium methionine supplementation on lactation performance, hepatic respiratory rate and anti-oxidative capacity in early-lactating dairy cows

• Published in: Animal (Cambridge, England) England), 2021-09, Vol.15 (9), p.100326-100326, Article 100326
• Main Authors: Wu, Z.Z., Peng, W.C., Liu, J.X., Xu, G.Z., Wang, D.M.
• Format: Article
• Language: English
• Subjects: Animals; Cattle; Chromium; Chromium chelate; Diet - veterinary; Dietary Supplements; Early lactation; Female; Holstein cows; Lactation; Metabolism; Methionine; Milk; Pregnancy; Production performance; Respiratory Rate
• ISSN: 1751-7311; 1751-732X
• DOI: 10.1016/j.animal.2021.100326

Chromium may regulate dairy cow metabolism; a chelated formation of chromium methionine (Cr-Met) is available to the feed industry. The objective of this study was to investigate the effect of Cr-Met supplementation on lactation performance, hepatic respiratory rate and anti-oxidative capacity in early-lactating Holstein dairy cows. 64 multiparous cows were assigned to 16 blocks based on parity and milk yield and then the four cows in a block were randomly allocated to four treatment groups with 0, 4, 8 or 16 g/d of Cr-Met per cow supplemented to a basal diet. Cows were moved from an open dry lot to a naturally ventilated tie stall barn 2 weeks before treatment to adapt to this facility, fed and milked at 0630, 1400, and 1930 h every day. The experiment lasted for 12 weeks. Milk yield and composition were recorded weekly. Dry matter intake was measured every 2 weeks for a total of six times throughout the trial. The plasma variables were measured in weeks 4, 8 and 12 of the experiment. Supplementation of Cr-Met did not affect DM intake of cows. As the supplementation of Cr-Met increased, yields of milk, fat, energy corrected milk (P