An alternative model for additive and cytoplasmic genetic and maternal effects on lactation.
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 paternal half-sib correlation were consistent with the presence of cytoplasmic inheritance. A definitive answer to the question of cytoplasmic inheritance of lactation traits awaits a designed experiment, likely employing transfer of identical nuclei into varying cytoplasmic backgrounds.
Kirkpatrick
B W
BW
Department of Meat and Animal Science, University of Wisconsin-Madison, 53706.
Dentine
M R
MR
D000818:Animals; D002417:Cattle / Q000235:genetics*; D005111:Extrachromosomal Inheritance; D005260:Female; D005838:Genotype; D007774:Lactation / Q000502:physiology*; D008957:Models, Genetic; D010641:Phenotype; D011247:Pregnancy