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首页> 外文期刊>Proceedings of the New Zealand Grassland Association >Effect of pasture species on milk yield and milk composition.
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Effect of pasture species on milk yield and milk composition.

机译：牧场种类对牛奶产量和牛奶成分的影响。

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One preliminary 10-day experiment in autumn 1994 and four 10-day experiments throughout the 1994/95 lactation were carried out to investigate the effect of pasture species on the yield, composition and total colour of milk from dairy cows. Five 1-hapaddocks were divided into five 0.2-ha strips and established in Trifolium repens cv. Grasslands Kopu, Lolium perenne cv. Yatsyn-1, Phleum pratense cv. Grasslands Kahu or Dactylis glomerata cv. Grasslands Kara. Sowing rates were 15, 8, 10 and 6 kg/ha, respectively. Thirty-two dairy cows were allocated across the 4 treatments, each treatment being cut so that cows were offered a similar allowance of green leaf material (maintaining a sward height of 6 cm for L. perenne and D. glomerata or 4 cm for T. repens and P. pratense). Cows grazing T. repens produced higher milk yields than cows grazing the other 3 pasture species, with cows grazing P. pratense and L. perenne producing more than those grazing D. glomerata. Cows grazing P. pratense produced milk with a higher fat content than the other 3 species, whereas grazing T. repens increased lactose content. Milk solids production was also highest on T. repens. Within the grasses P. pratense resulted in the highest milk solids production. These pasture species did not affect the total colour of milk. Grazing on L. perenne in the preliminary trial resulted in the greatest liveweight gain, but no significant differences in liveweight and condition score were observed in the trials run during 1994/95. It issuggested that it may be possible to manipulate milk composition by altering pasture composition rather than by processing methods.
机译：在1994年秋季进行了一个初步的10天实验，在1994/95泌乳期进行了四个10天实验，以研究牧场物种对奶牛产奶量，组成和总色的影响。将五个1-hapaddocks分为五个0.2公顷的条带，并在白三叶草中建立。草原Kopu，黑麦草Yatsyn-1，Phleum pratense简历。草原Kahu或Dactylis glomerata简历。草原卡拉。播种量分别为15、8、10和6公斤/公顷。在这4种处理方法中分配了32头奶牛，每一种处理方法都被砍掉，以便向奶牛提供类似的绿叶材料余留（紫苏和D. glomerata的草地高度保持6厘米，T的草地高度保持4厘米）。 repens和P. pratense）。与牧草其他3种牧草种类的母牛相比，放牧白桦的奶牛的产奶量更高，而放牧P. pratense和L. perenne的奶牛的产奶量要高于放牧D. glomerata的奶牛。放牧P. pratense的奶牛的脂肪含量高于其他3种，而放牧T. pens的奶牛的乳糖含量更高。白桦的乳固体产量也最高。在草中，P。pratense产生了最高的牛奶固体产量。这些牧场物种不会影响牛奶的总颜色。在初步试验中放牧Perenne L.导致最大的体重增加，但是在1994/95年间进行的试验中未观察到体重和状态评分的显着差异。建议通过改变牧场组成而不是通过加工方法来控制牛奶的组成。

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