11 August 1995

MOET boosts genetics

GENETIC progress increases by 50% when multiple ovulation and embryo transfer (MOET) programmes are used to increase selection intensity among females and reduce generation intervals, according to researchers at the Scottish Agricultural College (SAC), Edinburgh.

But reaching that target requires about 10 progeny a donor. To achieve this donor ewes are synchronised in oestrus using intervaginal pessaries, impregnated with 45mg of Cronolone, for 12 days.

Superovulation is then induced by treatment with an ovine follicle stimulating hormone – such as Ovagen – administered in eight equal doses at 12-hourly intervals about 60 hours prior to the end of the progestagen treatment. These ewes are also given 0.5ml of Estrumate, a prostoglandin, at the time of the first injection of Ovagen.

Intra-uterine insemination by laparoscopy is carried out 48 hours after the end of progestagen treatment. Six days later embryos are recovered by laparoscopy and transferred into synchronised Suffolk cross recipient ewes.