Increasing the efficiency of suckled calf production using embryo transfer technology.
The data reviewed in this paper illustrate the benefits of increased output that can be obtained from suckler herds using embryo transfer technology. The technology can be used within breeding schemes to increase the rate of genetic progress for selected traits or to transfer embryos of superior genetic merit and, in the future, embryos of predetermined sex to beef cows. The success of the technology is dependent on the achievement of good pregnancy rates. Experience gained on commercial farms suggests that the main reason for poor success rates in some herds lies with the general level of management of such herds rather than with the reproductive technology itself. Much experience has been gained on the management of embryo transfer recipients and twin-bearing cows. In particular, the nutritional requirements of such animals during the early post partum period and during mid and late pregnancy, and the management of twin-bearing cows during the perinatal period, are discussed.
Sinclair
K D
KD
Scottish Agricultural College, Bucksburn, Aberdeen.
Broadbent
P J
PJ
D000818:Animals; D001947:Breeding; D002417:Cattle / Q000235:genetics / Q000502:physiology*; D004624:Embryo Transfer / Q000379:methods / Q000592:standards / Q000662:veterinary*; D005260:Female; D005298:Fertility / Q000502:physiology*; D005307:Fertilization in Vitro / Q000379:methods / Q000592:standards / Q000662:veterinary; D011247:Pregnancy; D018873:Pregnancy Rate; D011272:Pregnancy, Multiple / Q000502:physiology; D014427:Twins