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首页> 外文期刊>Crop and Pasture Science >Fleece rot and body strike in Merino sheep. VI. Experimental evaluation of some physical fleece and body characteristics as indirect selection criteria for fleece rot
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Fleece rot and body strike in Merino sheep. VI. Experimental evaluation of some physical fleece and body characteristics as indirect selection criteria for fleece rot

机译：羊毛腐烂和美利奴绵羊的身体遭受攻击。 VI。某些物理羊毛和身体特征作为羊毛腐烂间接选择标准的实验评估

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Indicators of staple thickness, staple weight, staple density, wool weight cm -2, crimp frequency, dust penetration, fibre diameter (mean, variability), birthcoat score, and neck and body wrinkle were evaluated for their suitability as indirect selection criteria against fleece rot and body strike. The fleece traits were assessed in 949 Merino ewe hoggets representing the progeny from 134 sires in 15 contemporarily managed flocks. Fleece rot and body strike were assessed following experimental induction. In decreasing order of importance, variability (s.d.) in fibre diameter, average staple thickness, crimp frequency, variability (c.v.) in fibre diameter, mean fibre diameter, birthcoat score, staple density, variability in staple thickness, staple weight, and neck wrinkle score, accounted for a significant component of the variation in liability of sheep to fleece rot. Body wrinkle, variability (c.v.) in staple thickness, staple length, dust penetration, and wool weight cm-2 were not important. Based on combined estimates of the heritability of the indicator trait and its genetic correlation with fleece rot, variability in fibre diameter (s.d.) and birthcoat score showed the highest potential as indirect selection criteria. Variability in fibre diameter (s.d.) also showed a similar scope for selection against body strike. Indicators of mean staple thickness, crimp frequency, dust penetration and wrinkle score showed little or no scope for indirect selection against fleece rot or body strike. The role of variability in fibre diameter (s.d.) as an indirect selection criterion for fleece rot and body strike in designed breeding programmes which include other important objectives, will need to be further evaluated, given an undesirable genetic correlation with clean fleece weight. High between-flock correlations were observed for a number of fleece traits and susceptibility to fleece rot. Susceptible flocks were characterized by fleeces with longer, heavier, thicker staples with a lower crimp frequency, and higher fibre diameter with a higher variability. Predicting the susceptibility of flocks to fleece rot and body strike, through a between flock index based on the measurement of simple fleece traits, is suggested.
机译：评价了订书钉厚度，订书钉重量，订书钉密度，羊毛重量cm -2，卷曲频率，灰尘渗透，纤维直径（均值，可变性），出生衣得分以及脖子和身体皱纹的指标是否适合作为抵制羊毛的间接选择标准腐烂和身体罢工。在949头美利奴羊母猪群中评估了羊毛的性状，这些羊群代表了来自15个同期管理的羊群中134羽公羊的后代。实验诱导后评估羊毛腐烂和身体罢工。按照重要性从高到低的顺序排列，纤维直径的变化率（sd），平均短纤维厚度，卷曲频率，纤维直径的变化率（cv），平均纤维直径，底涂层得分，短纤维密度，短纤维厚度的变化性，短纤维重量和颈部皱纹得分，是绵羊对羊毛腐烂的责任变化的重要组成部分。身体皱纹，订书钉厚度，订书钉长度，灰尘渗透和羊毛重量cm-2的变异性（c.v.）不重要。根据指标性状的遗传性及其与羊毛腐烂的遗传相关性的综合估计，纤维直径（标准差）和出生衣得分的变异性显示出最高的间接选择标准潜力。纤维直径（s.d.）的变化也显示出类似的选择范围以防止身体撞击。平均订书钉厚度，卷曲频率，灰尘渗透和皱纹得分的指标显示，很少或没有选择间接选择以防止羊毛腐烂或身体被击打的可能性。在设计的育种计划中，纤维直径的变化（s.d.）作为羊毛腐烂和身体罢工的间接选择标准的作用，包括与其他重要目标有关的遗传育种，由于与洁净的羊毛重量存在不良的遗传相关性，需要进一步评估。观察到许多绒毛性状和绒毛腐烂的易感性。易感羊群的特征是羊毛更长，更重，更厚的订书钉具有较低的卷曲频率，而纤维直径较大且可变性较高。建议通过基于简单羊毛特征测量的羊群之间指数来预测羊群对羊毛腐烂和身体罢工的敏感性。

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