Evaluation of the feasibility of a juvenile MOET scheme in sheep
R. Rangel-Santos, M.F. McDonald, G.A. Wickham
Department of Animal Science, Massey University, Palmerston
North, New Zealand
Proceedings of the New Zealand Society of Animal Production.
1991, 51: 139-142
The feasibility of a juvenile MOET (multiple ovulation and
embryo transfer) scheme in sheep was evaluated in three trials using 6-7
month-old animals. Ovulation rate was not affected by the dose (1.3 vs
1.1) or the time (1.5 vs 0.9) of PMSG administration, but it was higher
in adults than lambs (2.0 vs 1.15, P<0.05) (Trial 1). Adults also
showed a higher percentage of animals in heat (89 vs 60, P<0.05) and a
higher percentage of eggs recovered (87 vs 56, P<0.05) or fertilised (82
vs 48, P<0.05). In Trial 2, a higher response was achieved with PMSG
than FSH-P, Ovagen or PMSG + Ovagen (4.18 vs 1.78, 1.06 and 2.05,
P<0.05). GnRH did not affect the ovarian response to gonadotrophins
(2.29 vs 2.25, P<0.05). Embryo viability appeared higher in lambs
treated with Ovagen alone. A combination of Ovagen + PMSG and with or
without GnRH did not improve significantly (P<0.05) the response
compared to the administration of PMSG plus GnRH (2.3, 2.8, 2.2 and 2.8
vs 1.7) (Trial 3). The superovulatory treatments involved failed to
induce satisfactory ovulatory responses in these prepubertal sheep.
Keywords: NZSAPAB;
Lambs; gonadotrophin; ovulation rate; embryo transfer
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Last Updated 25-01-1997
