title: A comparison of the reproductive and growth performances of offspring from broiler breeder males selected for early growth rate using artificial insemination and unselected males kept on deep litter.
abstract: Broiler breeder males were selected for early growth rate at 5 weeks of age (average weight + 0.5 SD). The reproductive and growth performances of the offspring of these males using artificial insemination with stored semen was compared with those from non-selected males kept on deep litter under conditions of natural mating. On three different occasions (31, 41 and 51 weeks of age), the eggs of the two treatments were incubated and, although the reproductive performances showed little difference over the entire period, hatchability of eggs set was significantly (p less than 0.01) higher for the field hens on the first occasion. The opposite was true after 50 weeks of age due to a serious decline in fertility in natural mating. At all periods, the selected males produced significantly (p less than 0.01) heavier offspring at six weeks of age.
mesh_terms: D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000254:growth & development*; D005260:Female; D005298:Fertility; D007315:Insemination, Artificial; D008297:Male