Effect of copper and zinc on blood and milk parameters and performance of dairy cows
Thirty fives Holstein cows were chosen to study the blood biochemical indicators with a single-factor test design in three copper levels (21.5, 31.5 and 41.5 mg/kg) and three zinc levels (50.15, 90.15 and 130.15 mg/kg). The results showed that the supplement of 20 mg of Cu/kg DM and above 40 mg of Cu/kg DM may increase Cu-Zn-superoxide dismutase (Cu-Zn-SOD) in milk (PO.05), but did not increase milk yield and improve chemical composition (P＞0.05). Zinc concentration in milk could be higher as supplemented 80 mg of Zn/kg DM (P＜0.05). The concentration of copper, serum ceruloplasmin, haemoglobin and the activity of Cu-Zn-SOD in blood may be increased (P＜0.01) by 37, 60, 5.1 and 5.9％, respectively, as the supplement of dietary copper was above 31.5 mg/kg.
copper zinc performance blood milk cows
Z.-B.Yang W.-R.Yang S.-Z.Jiang G.G.Zhang Z.Y.Li H.Zhao
Department of Animal Nutrition, Shandong Agricultural University Daizong Road No.61,Taian, 271018 Shandong, P.R.China
国际会议
The 7tb International Symposium on the Nutrition of Herbivores(ISNH-7)(第七届国际草食动物营养研讨会)
北京
英文
1071-1075
2007-09-16（万方平台首次上网日期，不代表论文的发表时间）