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首页> 外文期刊>African Journal of Biotechnology >Clinical mastitis from calving to next conception negatively affected reproductive performance of dairy cows in Nanning, China
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Clinical mastitis from calving to next conception negatively affected reproductive performance of dairy cows in Nanning, China

机译：从产犊到下一胎的临床乳腺炎对中国南宁奶牛的生殖性能产生负面影响

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The purpose of this study was to evaluate the effect of clinical mastitis between calving and next conception on reproductive performance in Chinese Holstein cows. Six hundred and three multiparous Holstein cows from a commercial dairy farm were divided into three groups respectively: cows with first clinical mastitis before first artificial insemination (AI) (MG1; n = 113), cows with first clinical mastitis between first AI and pregnancy diagnosis (MG2; n = 36) and cows without any clinical disease (CG; n = 454). Clinical cases of mastitis were identified at every milking by the trained milkers or the herd manager based on abnormal milk or signs of inflammation of the mammary gland. Number of days from calving to first AI and days from calving to conception, number of AI per conception, and the conception rate at first AI were evaluated in each group. The number of days to first AI was significantly greater for cows in MG1 than MG2 and CG (P 0.05), but they were all greater than cows in CG (P 0.05), however, conception rate for those groups were both lower than for CG (P < 0.01). In conclusion, clinical mastitis during early lactation markedly and negatively influenced reproductive performance of dairy cows. Therefore, reduction of clinical mastitis in early lactation should also improve reproductive performance of dairy cows. Further study is needed to better understand the mechanisms of how clinical mastitis affects reproductive performance in dairy cows which could lead to better strategies to avoid such negative effects.
机译：这项研究的目的是评估产犊和下一胎之间的临床乳腺炎对中国荷斯坦奶牛繁殖性能的影响。将来自商业奶牛场的603只多头荷斯坦奶牛分别分为三组：第一次进行人工授精（AI）之前患有第一临床乳腺炎的奶牛（MG1; n = 113），在第一次进行AI和怀孕诊断之间出现第一临床乳腺炎的奶牛。 （MG2; n = 36）和没有任何临床疾病的母牛（CG; n = 454）。训练有素的挤奶者或畜群管理员每次挤奶时，均会根据异常乳汁或乳腺发炎的迹象确定乳腺炎的临床病例。在每组中，评估从产犊到第一次AI的天数和从产犊到受孕的天数，每个受孕的AI数以及首次AI的受孕率。 MG1奶牛的初次AI天数明显高于MG2和CG（P 0.05），但均高于CG2奶牛（P 0.05），但是，这两组的受孕率均低于CG （P <0.01）。总之，早期哺乳期的临床乳腺炎对奶牛的生殖性能有显着和负面的影响。因此，减少泌乳早期的临床乳腺炎也应改善奶牛的繁殖性能。需要进一步研究以更好地了解临床乳腺炎如何影响奶牛繁殖性能的机制，这可能会导致采取更好的策略来避免这种负面影响。

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