Abstract

Two trials were conducted to determine the effect of different oestrous synchronisation regimens on oestrous behaviour, timing of ovulation and fertility of fallow deer. In Trial 1, 59 mature does were allocated to 6 treatment groups (n+9-10 per group). Does in Groups 1, 2 and 3 each received an i.m. injection of an analogue of prostaglandin F2alpha (PG; 500 ug cloprostenol) on Day 13 of a synchronised oestrous cycle. Animals in Group 2 and 3 also received 50 or 100 IU PMSG respectively at the time of PG administration. Does assigned to Groups 4, 5 and 6 each received an intravaginal CIDR device for 14 days with animals in Group 5 and 6 also receiving 50 or 100 IU PMSG respectively, at the time of CIDR device withdrawal. Incidence of oestrus was higher following treatment with CIDR devices than with PG (29/30 vs 12/29, P<0.001). PMSG induced earlier onset of oestrus (34.6

GH, Shackell, and KL Isaacs

Proceedings of the New Zealand Society of Animal Production, Volume 51, , 107-110, 1991