title: Inheritance of some of the economic traits of Italian Friesian cattle. I. Heritability of age at first calving, first lactation yield and first lactation length.
mesh_terms: D000818:Animals; D001947:Breeding; D002417:Cattle / Q000254:growth & development*; D005260:Female; D005298:Fertility; D005860:Germany, West; D005865:Gestational Age; D007558:Italy; D007774:Lactation; D010641:Phenotype; D011247:Pregnancy; D013045:Species Specificity