Effects of Dietary Supplementation of Chromium-Yeast on the Performance and Blood Biochemical Parameters in Heat-stressed Dairy Cows
According to parity, calving day, daily milk yield, forty-four healthy dairy cows with average milk production of 27.7 kg/head/day at a 120-day milking period after calving were divided randomly into four dietary groups (control, treatments Ⅰ, Ⅱ and Ⅲ).Temperature and humidity index(THI) in the trial period averaged 81.50.The dairy cows were pre-fed with a commercial diet for 15days; thereafter the formal experiment lasted for 45 days, in which, the control animals were fed with basic diets, and the animals in treatment Ⅰ, Ⅱ and Ⅲ were supplemented with chromium in concentrations of 0.40, 0.80, 1.20mg of Cr as chromium-yeast/kg, respectively.Comparing with the control group, application of chromium-yeast increased milk yields to some extent, but a significant rising was shown only in treatment Ⅱ (6.3%, P<0.05); the serum concentration of FT3 and the ratio of FT3 to FT4 were reduced significantly in treatment Ⅰ and Ⅱ (P<0.01); and insulin level was improved comparatively in treatment Ⅰ (P<0.05).
Dairy cow Heat-stress Chromium-Yeast Milk productivity Blood biochemical parameters
Liang Xue-wu Zhang Long-tao Liu Qing-hua Jeff Wu
Dairy Cattle Research Institute, Fujian Agricultural and Forestry University, Fuzhou, Fujian,350002, Institute of Animal Science and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou Alltech Asia Pacific Bioscience Center
国内会议
陕西杨凌
英文
387-391
2011-05-01（万方平台首次上网日期，不代表论文的发表时间）