FLEECE ROT IN MERINO SHEEP .1. THE HERITABILITY OF FLEECE ROT IN UNSELECTED FLOCKS OF MEDIUM-WOOL PEPPIN MERINOS
FLEECE ROT IN MERINO SHEEP .1. THE HERITABILITY OF FLEECE ROT IN UNSELECTED FLOCKS OF MEDIUM-WOOL PEPPIN MERINOS
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DOI：
10.1071/ar9840423
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发表时间：
1984-01-01
影响因子：
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通讯作者：
ATKINS, KD
中科院分区：
文献类型：
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作者：
MCGUIRK, BJ;ATKINS, KD
在澳大利亚新南威尔士州的Trangie农业研究中心，对未选择的中毛Peppin美利奴羊群中的大公母羊和公羊进行了15年的羊毛腐病观察。每只羊在剪羊毛前沿着背线进行主观视觉评估，得分从0（无羊毛腐烂）到5（非常严重的羊毛腐烂）。数据被分析为对羊毛腐病易感性的2个指标：上面定义的分数；在发病率方面，羊毛腐病被视为全有或全无的性状。羊毛腐烂的平均发生率超过23群羊次。年份组合为36%，但差异很大，从8-90%不等。其他环境因素（性别、出生类型和年龄）一般对羊毛腐病的影响较小且不显著。在调整了显著的环境影响后，至少有3个后代的母猪的同父异母遗传力估计为0.36（±）。0.07), 0.23(+-。0.07)为发生率。分别进行了50次分析。年数据集的低，中，高发病率。正如理论上预期的那样，在中间发生率数据集中获得了发生率的最高遗传率估计值。子代坝遗传力估计(.+-。羊绒腐病评分和发病率的SE分别为0.21（±±）。0.05)和0.14(+-。0.04)。相应的后代-父系评分和发病率估计值为0.20（±）。0.06)和0.17(+-。0.05)。对潜在的羊毛腐病的遗传能力的现实估计是40%左右。
Fleece rot was observed on hogget ewes and rams in unselected medium-wool Peppin Merino flocks over a 15-yr period at Trangie Agricultural Research Centre, New South Wales [Australia]. Each sheep was given a score of from 0 (no fleece rot) to 5 (very severe fleece rot) following a subjective visual assessement along the backline prior to shearing. Data were analyzed as 2 measures of susceptibility to fleece rot: a score as defined above; and incidence, where fleece rot was treated as an all-or-none trait. The average incidence of fleece rot over 23 flock .times. year combinations was 36%, but this varied widely, from 8-90%. Other environmental factors (sex, birth type and age of dam) generally had small and non-significant effects on fleece rot. After adjusting for significant environmental effects, the half-sib heritability estimates for sires with at least 3 progeny were 0.36 (.+-. 0.07) for score and 0.23 (.+-. 0.07) for incidence. Separate analyses were conducted for flock .times. year data sets of low, intermediate and high incidences. The highest heritability estimate for incidence was, as expected theoretically, obtained in the data set of intermediate incidence. Offspring-dam heritability estimates (.+-. SE) for fleece rot score and incidence were respectively 0.21 (.+-. 0.05) and 0.14 (.+-. 0.04). Corresponding offspring-sire estimates for score and incidence were 0.20 (.+-. 0.06) and 0.17 (.+-. 0.05). A realistic estimate of the heritability of the underlying liability to fleece rot is on the order of 40%.