This study investigated apparent reproductive failure occurring in seasonally anoestrous progesterone-primed red deer hinds when they were induced to ovulate with the GnRH analogue, buserelin. In March 1988 (non-breeding season), each of 11 progesterone-primed red deer hinds(Groups B and BO) were injected i.m. with 4, 3, 2, 2 and 10 ug buserelin (Receptal, Hoechst) at -48, -24, 0, 24, and 48 h relative to the time injected i.m. with 500 ug oestradiol benzoate. During the breeding season (April), ovulation was synchronised in another 4 hinds (Group C) using CIDRs. Oestrous behaviour was less noticeable and delayed (P>0.05) in Group B hinds and peak LH levels were lower (P>0.01) and occurred later (P>0.01) relative to Group ), BO and C hinds. Two weeks after CIDR withdrawal 3/5 B, 2/4 O, 3/6 BO and 4/4 C hinds had a corpus luteum present. During theses two weeks plasma progesterone levels were elevated in B, BO and C hinds but were low in the O hinds. None of the buserelin- and/or oestradiol-induced ovulations resulted in pregnancy. These results show that ovulations induced in these anoestrous red deer hinds by the use of a GnRH analogue or oestradiol were not accompanied by normal hormonal and behavioural patterns.
Proceedings of the New Zealand Society of Animal Production, Volume 50, , 495-498, 1990
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