半胱胺盐酸盐对奶牛尿液pH和血液中矿物质元素含量的影响

摘要

To explore the effects of cysteamine hydrochloride on urine pH and blood mineral element content in lac-tation Holstein dairy cows.48 healthy Holstein dairy cows with similar milk yield,days in lactation and parity,were allocat-ed into six groups in a randomized complete block design with eight cows per group.CSH were supplemented with 0 (con-trol group),15,30,75,150 g/d and 300 g/d in the basal diet.The pre-experimental period lasted for 14 d,and the experi-mental period lasted for 56 d.The results showed as follows:(1)Urine pH were declined with the adding CSH dosage in-creasing,but there was no significant difference compared with the control group(P>0.05).(2)Blood zinc concentration of the 300 g/d group was significantly higher than that of the 75 g/d group (P<0.05).Results of the present study indicated that the safe supplemental level of CSH was within 150 g/d.%为研究日粮中添加半胱胺盐酸盐（CSH）对中国荷斯坦奶牛尿液pH和血液中矿物质元素含量的影响，本试验选择产奶量、泌乳日龄、胎次相近的荷斯坦奶牛48头，分为6组，每组8头，分别在日粮中添加0（对照组）、15、30、75、150 g/d和300 g/d的CSH，预试期14 d，正式期56 d。结果表明：（1）奶牛尿液pH随着CSH添加量增大而有逐渐降低的趋势，但与对照组相比无显著差异（P＞0.05）。（2）CSH添加量为300 g时，血液中锌的含量最高，且显著高于75 g组（P＜0.05）。由此可见，奶牛日粮中CSH的添加量不宜超过150 g。