摘要
Abstract
A total of twelve Chinese Holstein cows were diyided into four group and the experimental design of 4×4 Latin square method:group A as the control group ( basal diet) , groups B. C and D as added 120. 280 and 380 (mg/kg) of Zn-met on the basal diet were used to investigate the effect of dietary zine methionine on performance and relaled biochemical indices in the dairy cattle. The results indicated that: groups B, C and D increased by 1. 28 (5. 65％ ) , 1. 59 (7. 02％ ) and 1. 66 (kg) (7. 33％) (P＜0. 05) , and the 4％ fat corrected milk (FCM) in the groups B, C and D significantly increased by 0. 98 (4. 73％) , 1. 22 (5. 89％ ) and 1. 16 ( kg) (5. 60％ ) compared with group A ( P＜0. 05 ) ; no significant differences were found among B , C and D group in milk fat percentage , lactose content, non-fat milk solids content, compared with group A ( P＞0. 05) , milk protein contents of the groups B. C and D were significantly increased by 4. 56,7. 02 and 7. 72 ( ％ ) ( P＜0. 05) compared with group A; the zinc content of milk in groups B, C and D was very significantly increased (P＜0. 01) by 1. 05 (36. 59％ ) , 1. 59 (55. 40％ ) , 2. 08 ( μg/mL) (72. 47％) compared with group A. The somatic cell count ( SCC) of groups B, C and D were lower 1. 64×104/mL ( 5. 65 ％ ) , 3. 23×104/mL ( 11. 12％ ) , 3. 89×104/mL ( 13. 39％ ) than that in group A; DMI of groups B, C and D were increased by 0. 98％ , 1. 51％ , 1. 66％ than that in group A (P＞0. 05) ; the economic analysis showed that the group C was increased 3. 42 yuan RMB each cow per day than group A and was the best one.关键词
奶牛/蛋氨酸锌/生产性能/生化指标分类
农业科技
