Occurrence of preterm calving in Great Britain and associations with milk production and reproductive performance in dairy cattle.
Occurrence of preterm calving in Great Britain and associations with milk production and reproductive performance in dairy cattle.
复制标题
大不列颠早产的发生，并与牛奶生产和奶牛生殖表现有关。
DOI：
10.1136/vetreco-2017-000221
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发表时间：
2018
影响因子：
1.4
通讯作者：
Guitian J
中科院分区：
文献类型：
--
作者：
Damaso AF;Velasova M;Winden SV;Chang YM;Guitian J
本研究描述了英国早产奶牛的发生情况，并评价了早产与奶牛产奶量、繁殖性能和牧场存活率之间的关系。共有53个英国奶牛场和5759只有详细繁殖和牛奶记录数据的动物被用来组成两个研究组：早产小牛(在怀孕266天至277天之间产犊)和足月小牛(怀孕278天及以上产犊)。采用混合效应模型来比较不同组之间的产奶量、乳房炎的临床病例和每个受孕的服务数量。Kaplan-Meier曲线和Cox回归分析比较了不同组间从产犊到受孕的时间、产犊间隔时间和农场存活率。早产奶牛产奶量显著降低(P<；0.01)，乳脂率显著降低(P=0.02)，乳蛋白含量显著提高(P=0.01)，农场存活率显著延长(P<；0.01)，产犊至受孕间隔时间缩短，单胎服务减少，尽管其他因素也影响繁殖效果。经历早产与较低的产奶量和较长的农场生存时间有关。应进一步调查导致早产的潜在危险因素，如传染病、饮食和畜牧业做法。
This study describes the occurrence of preterm calving in Great Britain and evaluates its associations with subsequent milk production and reproductive performances and survival on farm of dairy cows. A total of 53 British dairy farms and 5759 animals with detailed breeding and milk recording data available were used to form two study groups: preterm calving (calving occurring between days 266 and 277 of gestation) and full-term calving (calving occurring at 278 days of gestation and over). Mixed effects models were implemented to compare milk production, clinical cases of mastitis and number of services per conception between groups. Kaplan-Meier curves and Cox regression analyses compared time from calving to conception, calving interval and survival on farm between groups. Preterm calving cows showed significantly lower milk yield (P<0.01) and butter fat per cent (P=0.02), increased milk protein per cent (P=0.01), longer survival on farm (P<0.01), and a tendency for shorter calving to conception intervals and fewer services per conception, although other factors were involved in the reproduction outcomes. Experiencing a preterm calving is associated with lower milk production and longer survival times on farm. Potential risk factors for preterm calving, such as infectious diseases, diet and husbandry practices, should be further investigated.