Oestrous behaviour and luteal function in anoestrous red deer
hinds treated with a GnRH analogue or oestradiol
J.A. Duckworth, G.K. Barrell
Animal and Veterinary Sciences Group, Lincoln University,
Canterbury, New Zealand
Proceedings of the New Zealand Society of Animal Production.
1991, 51: 55-62
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.
Keywords: NZSAPAB;
Ovulation, red deer, oestrus, progesterone, LH, GnRH analogue,
oestradiol
Download abstract in text format
Last Updated 25-01-1997
