Effect of trace mineral supplementation during transition period on postpartum disorders and reproductive performance in dairy cows

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  • 周産期における微量ミネラル投与が乳牛の疾病発生と繁殖成績に及ぼす影響
  • シュウサンキ ニ オケル ビリョウ ミネラル トウヨ ガ ニュウギュウ ノ シッペイ ハッセイ ト ハンショク セイセキ ニ オヨボス エイキョウ

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Abstract

Twenty-one pregnant Holstein cows were divided into two groups, supplemented cows and control cows. The supplemented cows (n=11) were fed the basal diet each day with the trace mineral complex (50g/cow/day), including Zn, Mn, Cu and Se etc., from four weeks before they were expected to calve through to eight weeks after calving. The control cows (n=10) were given the basal diet without the trace mineral complex. The supplemented cows had significantly higher serum concentrations (P<0.05) of Cu and Zn than those of the control cows. In addition, the serum AST activity of the supplemented cows was significantly lower (P<0.05) than that of control cows. Moreover, the prevalence of postpartum disorders in the supplemented and control cows was 18% and 50%, respectively. The first service conception rates in supplemented and control cows were 64%, and 30%, respectively. Cystic follicles occurred in only four of the control cows, and the occurrence was significantly higher (P<0.05) in Cu-deficient cows compared with the other cows at one week after calving. Besides, the prevalence of mastitis in Cu and Zn deficient cows was significantly higher (P<0.05) than that of Cu and Zn sufficient cows at one week after calving. In conclusion, Cu and Zn supplementation to diet during the transition period may reduce the occurrence of postpartum disorders and follicular cysts, and may improve fertility in dairy cows, when the feed contains an adequate amount of these substances.

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