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首页> 美国政府科技报告 >Effect of Nitrate in Drinking Water on Reproductive and Productive Efficiency of Dairy Cattle.
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Effect of Nitrate in Drinking Water on Reproductive and Productive Efficiency of Dairy Cattle.

机译：饮用水中硝酸盐对奶牛繁殖和生产效率的影响。

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The long term effect of high nitrate stock water intake on reproductive and productive performance of dairy cattle was investigated. A 54-cow herd was divided into control (drinking water contained 19.3ppm nitrate) and treatment (drinking water contained 374ppm nitrate from added potassium nitrate) groups. The investigation was conducted over a 35-month period. During the first 20months,there were no significant differences in reproductive performance between groups as measured by incidence of abortions,retained placentas,cystic ovaries,services,conceptions,services per conception or percent first service conception. During the last 15months,the only significant difference between groups was a higher services per conception (1.71vs. 1.18) and a lower percent first service conception (42.9vs. 73.1) for the nitrate group. There were no significant differences in milk production or composition per milking day;however,total production was slightly lower for the nitrate group because of a longer dry period,thought to be a result of delayed conception for the nitrate group.

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