Development of an effective goat embryo transfer regime
H.R. Tervit; P.G. Goold and R.D. McKenzie
Ruakura Animal Research Station, Ministry of Agriculture and
Fisheries, Hamilton; Late of Ruakura Animal Research Station and
Wakelins Farm, Lands and Survey Block, Paihia
Proceedings of the New Zealand Society of Animal Production.
1986, 46: 233-236
Trials between 1979 and 1984 with Angora or Saanen donors showed
that synchronisation of oestrus with progesterone injections delayed
oestrus compared with progestagen sponges and that this delay was
associated with fewer follicles and increased egg recovery and
fertilisation rates. Highest ovulation rates were achieved when FSH was
injected instead of PMSG and when donors were Saanens rather than
Angoras. Surgical egg recovery rates decreased in donors with
prematurely regressing ovulations. The response of recipients (feral or
Angora) to sponge treatment varied markedly between years. Recipient
pregnancy rate and embryo survival both increased when recipients were
surgically twinned rather than singled.
The various trials have enabled the development of an effective transfer
regime. This involves synchronising/superovulating donors with
progesterone/FSH and twinning or tripleting of recipients. Under these
conditions Angora and Saanen donors average respectively, 14.0 and 24.5
ovulations, 10.8 and 18.6 transferable embryos and 7.5 and 11.8 kids
born to recipients.
Keywords: NZSAPAB;
Goats; breeds; embryo transfer; oestrus; superovulation;
fertilisation; embryo survival
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Last Updated 18-03-1997
