title: Oestrus synchronization of dairy heifers - follow-up of the fertility of treated animals.
abstract: Field materials have been examined as regards the fertility of animals which have been oestrus synchronized as heifers. One material of 104 animals has been followed during three pregnancies and one material of 828 heifers has been studied as regards the interval between inseminations of animals returning to heat. Heifers in the same herds, inseminated during the same period of time as the synchronized animals, have been used as control animals. The studied parameters have shown no difference between the control group and the treated group. One exception is however that the conception rate after AI in induced oestrus was somewhat higher than the result of the first AI for the control animals.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D004973:Estrus Synchronization; D005260:Female; D005298:Fertility; D007315:Insemination, Artificial / Q000662:veterinary; D011247:Pregnancy; D011270:Pregnancy, Animal