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首页> 外文会议>Biennial session of the International Committee for Animal Recording >Current challenge for milk recording in dairy sheep and goats: the simplification of milk sampling design for chemical composition and somatic cell counts of milk
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Current challenge for milk recording in dairy sheep and goats: the simplification of milk sampling design for chemical composition and somatic cell counts of milk

机译：奶牛和山羊牛奶录制的当前挑战：用于化学成分和牛奶体细胞计数的牛奶采样设计的简化

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In dairy small ruminants, costs of the standard A_4 milk recording design, expressed in production margin per animal, are too high compared to that of dairy cattle. Thus it is a major obstacle to its use on a large scale. Therefore, different procedures of simplification both for quantitative (milk yield) and qualitative recording (milk composition for fat and protein contents and/or somatic cell count) have been proposed. Surveys carried out every two years in dairy sheep, in the framework of its ICAR working group, showed that the use of simplified designs for quantitative milk recording has been steadily increasing since 1990. Conversely, the use of simplified qualitative testing remains still limited. This paper describes a part-lactation sampling design (connected to the AC method for milk yield), which is the simplified qualitative recording method used in France in sheep, both for milk composition and for somatic cell count. The consequences of this simplified design on the loss of precisionand the genetic parameters are shown. The favourable genetic trend for milk composition, estimated in the French dairy sheep breeds, shows that this design is reliable for EB Vs, but needs cautious use for management purposes. The example of the sheep situation should be extended to goats to allow a larger development of milk recording in this species and particularly the recording of milk composition and somatic cell count.
机译：在乳制品小反刍动物中，标准A_4牛奶录制设计的成本在每只动物的生产余量中表达，与奶牛相比过高。因此，它是大规模使用的主要障碍。因此，已经提出了针对定量（牛奶产量）和定性记录（用于脂肪和蛋白质含量和/或体细胞计数的牛奶组合物）的不同简化程序。在奶牛的框架中，在ICAR工作组的框架中进行了每两年进行的调查显示，自1990年以来，使用简化的定量牛奶录音设计已经稳步增加。相反，使用简化的定性测试仍然有限。本文介绍了零乳液采样设计（连接到牛奶产量的AC方法），这是法国在绵羊中使用的简化定性记录方法，用于牛奶组合物和体细胞计数。此简化设计对遗传参数丧失的这种简化设计的后果。牛奶组合物的有利遗传趋势，估计在法国乳制品绵羊品种中，表明，这种设计对于EB与EB vs，但需要对管理目的进行谨慎用途。绵羊情况的例子应扩展到山羊，以便在该物种中更大的牛奶录制的发展，特别是牛奶组合物和体细胞计数的记录。

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