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首页> 外文期刊>New Zealand journal of agricultural research >Effect of cattle grazing strategies and pasture species on internal parasites of sheep
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Effect of cattle grazing strategies and pasture species on internal parasites of sheep

机译：牛放牧策略和牧草种类对绵羊内部寄生虫的影响

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Abstract The results of a three‐year study in New Zealand undertaken to compare the effect of alternating sheep and cattle grazing and of different pasture species on internal parasitism in lambs is reported. Despite the commonly held belief that the use of cattle in sheep production systems improves sheep health by reducing nematode burdens, this did not occur. Cattle substantially reduced pasture larval numbers. However, this failed to reduce parasite burdens in lambs as those managed in the absence of cattle apparently developed increased immunity to parasites in response to the greater larval availability. Varying the number of successive grazings by sheep or cattle from 1 to 4 did not change this result. Lamb carcass weights were improved by the presence of cattle, primarily because of improvements in pasture quality. Substituting 30% of the ryegrass area with lucerne or replacing ryegrass with a multi‐species mix consisting predominantly of bromes, tall fescue, phalaris, timothy, and red and white c...
机译：摘要报道了一项为期三年的研究结果，该研究旨在比较绵羊和牛轮流放牧以及不同牧场物种对羔羊内部寄生虫的影响。尽管人们普遍认为，在绵羊生产系统中使用牛可以通过减少线虫负担来改善绵羊的健康状况，但这并未发生。牛大大减少了草场幼虫的数量。但是，这不能减轻羔羊的寄生虫负担，因为在没有牛的情况下进行管理的羔羊显然响应于更大的幼体可利用性而提高了对寄生虫的免疫力。将绵羊或牛的连续放牧次数从1改变为4不会改变此结果。牛的存在可以改善羔羊cas体的重量，这主要是由于牧场质量的提高。用黑麦草代替黑麦草地区的30％，或用主要由溴，高羊茅，趾骨，蒂莫西和红白相间的多物种混合物代替黑麦草。

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