Comparison of Heritability Estimates from Daughter-Dam Regression and Paternal Half-Sib Correlation
نویسندگان
چکیده
منابع مشابه
Comparison of heritability estimates from daughter on dam regression with three models to account for production level of dam.
Three models were used to estimate heritabilities for milk yields at different production levels and for different years as twice the regression of daughter residual effects on dam residual effects. The denominator is the residual mean square for dams. The numerator is the difference between the residual term for sum of dam's and daughter's records and sum of residual terms for records of dams ...
متن کاملHeritability Estimates of Milk Production from Daughter on Dam Regression by Year and Management Level
Heritability estimated by year of freshening for firstqactation milk records of artificially sired Holstein cows in the northeastern United States from daughter on dam regression averaged about .34 on the linear scale and .31 on the logarithmic scale. Little change could be detected from 1965 to 1982. Number of daughterdam pairs was 197,338. Heritability estimates on the .5 and .4 power scales ...
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The first-lactation milk records of 20,850 artificially sired Holstein cows and their darns were analyzed by a sire-by-herd, variance components model to determine if unequal numbers of records in the filled subclasses had any effect on the paternal half-sib correlatiou or the daughter-dam regression. The variance components were estimated with the number per subclass held constant at 1, 2, 3, ...
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Results from a recent study that presented evidence suggesting a lack of cytoplasmic inheritance of lactation traits were reexamined using a model that included effects of additive genotype, cytoplasmic genotype, their interaction, and maternal influences. Under this model, equivalent estimates of heritability from daughter-dam and grand-daughter-grand-dam regression that exceed those from pate...
متن کاملSheep linkage mapping: nineteen linkage groups derived from the analysis of paternal half-sib families.
Nineteen linkage groups containing a total of 52 markers have been identified in the sheep genome after typing large paternal half-sib families. The linkage groups range in size from 2 markers showing no recombination to a group containing 6 markers covering approximately 30 cM of the sheep genome. Thirteen of the groups have been assigned to a sheep chromosome. Three groups contain markers fro...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1965
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(65)88466-1