Stimulation of Superovulation and Removal of Embryos with Regard to the Subsequent Conception and Milk Yield of Donor Cows

Abstract

The impact of superovulation stimulated by FSH-P on subsequent conception in embryo donors was studied on a group of 162 cows. After the recovery of embryos 121 animals (74.68 %) conceived after three subsequent inseminations; 59 of them (48.76 %) conceived after the first insemination. The highest conception rate after the first insemination (53.19 %) was recorded in cows superovulated within 60 days of parturition.On the average the donors conceived within 67.6 days and the animals superovulated within 60 days of parturition conceived within 59.11 days. The mean service period(SP) was about 148 days. In donors flushed within 60 days parturition it did not exceed 110 days. The milk yield of the donors remained practically unaffected by the superovulation proper and by embryo removal in the experimental group of animals and the decrease of milk yield per day and per animal did not exceed 0.66 kg.