Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Development of an effective goat embryo transfer regime.

Abstract

Trials between 1979 and 1984 with Angora or Saanen donor ♀♀ showed that synchronization of oestrus with progesterone injections delayed oestrus compared with progestogen sponges, and that this delay was associated with fewer follicles and increased ova recovery and fertilisation rates. Higher ovulation rates were achieved when FSH was injected instead of PMSG and when donors were Saanens rather than Angoras. Surgical ova 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 had 2 embryos transferred rather than a single. An effective transfer regime involving synchronizing/superovulating donors with progesterone/FSH and transferring 2 or 3 embryos to recipients, has been developed. Under these conditions, Angora and Saanen donors average 14.0 and 24.5 ovulations resp., 10.8 and 18.6 transferable embryos and 7.5 and 11.8 kids born to recipients.