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首页> 外文期刊>Productions Animales >Changes in somatic cell count in dairy cows free of clinical mastitis.
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Changes in somatic cell count in dairy cows free of clinical mastitis.

机译：无临床乳腺炎的奶牛体细胞计数的变化。

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摘要

Changes in somatic cell count were analysed in 404 lactations of 208 dairy cows managed on an INRA experimental farm in Marcenat, Cantal, France. Only lactations free of clinical mastitis were included in the study. On average, somatic cell count was minimal in the 2nd month of lactation (50 000 cells/ml) and maximal in late lactation (200 000 cells/ml). Primiparous cows showed higher somatic cell count than multiparous cows in early lactation, and lower in later lactation. Somatic cell count was higher in Holstein cows than in Montbeliard or Tarentaise cows. In late lactation, the difference between these 2 groups of breeds reached 120 000 cells/ml. This effect of breed was not linked to milk yield. Multiparous cows that were affected by more than one clinical episode of mastitis during the preceding lactations showed higher somatic cell count (+ 40 000 cells/ml over the whole lactation) than those that had had one or no clinical episode of mastitis during the preceding lactations. Somatic cellcount increased slightly during summer, independently of lactation stage. However, all these physiological variation factors could not explain bulk milk somatic cell counts higher than 300 000 cells/ml.
机译：在法国Cantal Marcenat的INRA实验农场管理的208头奶牛的404次泌乳中，分析了体细胞计数的变化。该研究仅包括无临床乳腺炎的哺乳期。平均而言，泌乳第2个月的体细胞计数最小（50000个细胞/ ml），哺乳后期第2个月的体细胞计数最大（200000个细胞/ ml）。在泌乳早期，初乳牛的体细胞计数高于多胎母牛，而在泌乳后期则较低。荷斯坦奶牛的体细胞计数高于蒙贝利亚德或塔伦泰兹奶牛。在哺乳后期，这两组品种之间的差异达到了120000个细胞/ ml。品种的影响与产奶量无关。在先前的泌乳期中，受到多次以上乳腺炎临床发作影响的多胎母牛的体细胞计数（整个泌乳期为+ 40 000个细胞/ ml）比在先前的泌乳期中经历过​​一次或无临床乳腺炎的母牛。夏季，体细胞数略有增加，与哺乳期无关。但是，所有这些生理变化因素都不能解释散装牛奶中体细胞计数高于300 000细胞/ ml的原因。

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