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首页> 外文会议>General Meeting of The European Grassland Federation >Biological performance of Holstein, Jersey, and Holstein x Jersey cows on Irish dairy farms
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Biological performance of Holstein, Jersey, and Holstein x Jersey cows on Irish dairy farms

机译：霍尔斯坦，泽西，霍尔斯坦X泽西母牛的生物表演

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摘要

The objective of the study was to compare milk production and fertility performance of purebred Holstein, Friesian and Jersey, and their respective crosses on 40 Irish spring-calving dairy herds from 2008 to 2012, inclusive. A total of 24,279 lactations from 11,808 cows were available for analysis. Least square means for traits of interest were estimated for purebred and crossbred animals using linear mixed models. Milk yield was greatest for Holstein (5,217 kg), intermediate for Friesian (4,591 kg),and least for Jersey (4,230 kg), whereas milk constituents (fat and protein concentration) were greatest for Jersey (9.38%), intermediate for Friesian (7.91%), and least for Holstein (7.75%). Milk solids (MS) yield (fat kg + protein kg) was greater in crossbred cows compared with their parental purebred parents; greatest MS yield was observed in Holstein x Jersey first-cross, yielding 25 kg more MS than the parental purebred average. Holstein x Jersey cows calved younger as heifers and had a lower calving interval compared with their purebred parents.
机译：该研究的目的是比较纯种Holstein，Friesian和泽西州的牛奶生产和生育性能，以及2008年至2012年40名爱尔兰弹簧乳制品牛群的各自交叉。 11,808奶牛共有24,279名哺乳动物进行分析。利用线性混合模型估计纯种和杂交动物的特征的最小二乘意味着。霍尔斯坦（5,217千克），奶油蛋白（4,591千克）的中间体（4,230千克）最大的牛奶产量最为伟大，而牛奶成分（脂肪和蛋白质浓度）最伟大，适用于泽西（9.38％），弗里斯省中级（ 7.91％），孔斯坦（7.75％）。与父母纯种父母相比，牛奶固体（MS）产量（脂肪kg +蛋白kg）更大。在Holstein X泽西岛的第一十字架中观察到最大的MS产量，比父母纯种平均水平更多的MS。 Holstein X泽西奶牛较年轻，因为他的纯血统父母相比较低的水平间隔。

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