Fertility of cloprostenol-treated dairy cattle inseminated at fixed times

The conception rate (C.R.) of 50 cycling crossbred dairy cattle lnseminted at 72 and 96 hr. (group 1/) or 72 hr. (group III} after the second of two intramuscular injections of 500 ug Cloprostenol (Estrumate ICI, a synthetic analogue structurally related to PGF2α) given 11 days apart was compared with first service C.R. of 18 untreated controls (group I). The higher C.R. in cloprostenol-treated cows (group II = 56%,' group III = 40%) than in untreated controls (group I = 28%) demonstrates that normal fertility could be expected with cloprosteno! and fixed time insemination. The lower C.R. in untreated animals re-emphasizes the difficulties of oestrous detection for artificial insemination under Malaysian conditions. The possibility now exists in Malaysia for a much greater utilization of valuable sires so that the potential benefits of an artificial insemination programme could be realized.

PDF 19. 38666.pdf Restricted to Repository staff only Download (239kB)

Actions (login required)

View Item