HOMOGAMETIC HETEROSIS IN CROSSBREEDING EXPERIMENTS WITH SHEEP
نویسندگان
چکیده
منابع مشابه
ASC-224: Crossbreeding Considerations in Sheep
Heterosis Heterosis, or hybrid vigor, refers to the increased vitality or “doing ability” of the crossbreds as compared to the average of the parental breeds. The only way to get heterosis is through crossbreeding. Heterosis is expressed by the crossbred lamb (individual) and by the crossbred ewe (maternal). Crossbred lambs, on the average, are more vigorous and have a higher survivability than...
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This is an oversimplification, but it will work for this discussion. An animal’s phenotype is observed or measured, but the animal’s breeding value is what is of interest to the sheep breeder. Unfortunately, it is not possible to know the true genetic merit of an animal for a particular trait. Therefore, in order to make selection decisions, its breeding value must be estimated. The animal’s ow...
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Since the influential work of Dickerson (1969), there has been considerable discussion of design of crossbreeding experiments, but little detailed treatment of optimisation. Recently, Cunningham and Connolly (1989) and Soelkner and James (1990) have discussed this question, but have used different optimality criteria. Connolly and Cunningham used the sum of sampling variances of estimators, whi...
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Crossbreeding effects for wool quality traits viz. greasy fleece weight (kg), staple length (cm), average fibre diameter (μ) and medulation percentage were estimated using the Dickerson’s and Kinghorn’s models. The data analyzed involved 15 genetic groups including Nali purebred, F1’s of two and three breeds, F2’s and reciprocal crossbred obtained from the crossing of Nali (N), Merino (M) and C...
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Data on 361 lambs of Mehraban (n=90), Ghezel (n=92), Ghezel × Mehraban (n=87), and Mehraban × Ghezel (n=92, sire breed listed first) were used to estimate individual Heterosisfor lamb growth. The obtained results demonstrated that lambs of purebreds of Ghezel and Mehraban showed the highest and the lowest birth weight, respectively (P
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ژورنال
عنوان ژورنال: Canadian Journal of Animal Science
سال: 1970
ISSN: 0008-3984,1918-1825
DOI: 10.4141/cjas70-056