منابع مشابه
1 Fundamental Aspects of Crossbreeding of Sheep : Use of Breed Diversity to Improve Efficiency of Meat Production
Breed diversity is a valuable resource of the sheep industry. Crossbreeding systems use breed diversity to increase productivity relative to purebred flocks. Crossbreeding systems vary in managerial complexity and in use of beneficial effects due to crossbred ewes and lambs. Efficiency of meat production is maximized in terminal crossbreeding systems by use of specialized sire breeds to complem...
متن کاملEconomic Selection Indices for Lean Meat Production in Sheep
SUMMARY Economic selection indices were derived for terminal sire h breeds or strains, using physical and financial results from ee~ealand export lamb-producing flocks.
متن کاملASC-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...
متن کاملEvaluation of Crossbreeding Effects for Wool Traits in Sheep
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...
متن کاملASC-222: Crossbreeding Considerations in Sheep
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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ژورنال
عنوان ژورنال: Genetics Selection Evolution
سال: 1975
ISSN: 1297-9686
DOI: 10.1186/1297-9686-7-2-231a