The insemination of sheep with fresh or frozen semen
H.R. Tervit, P.G. Goold, R.W. James and M.D. Fraser
Ruakura Animal Research Station, Ministry of Agriculture and
Fisheries, Hamilton and Wairakei Research Station, Ministry of
Agriculture and Fisheries, Hamilton
Proceedings of the New Zealand Society of Animal Production.
1984, 44: 11-14
Ewes were inseminated in 1982 and 1983 at the second oestrus
after synchronisation. They received fresh or frozen semen deposited
once or twice, either into the cervix, blind in the vagina, onto the
ovaries or into the uterine horn lumen. Very poor results occurred
after ovarian insemination. More ewes lambed when inseminated with
fresh compared to frozen semen, when inseminated twice rather than once,
and for 1983, the ranking of insemination positions (best to worst) was
intra-uterine, blind, cervix. Ewes lambing after insemination with
frozen semen in 1982 produced fewer multiples than those inseminated
with fresh semen. A single blind insemination of fresh semen gave a
lambing rate (64%) only slightly lower than for cervical deposition
(69%) and the intra-uterine technique performed well with both fresh and
frozen sperm (83% and 38%, respectively). Both these techniques should
be considered for artificial insemination.
Keywords: NZSAPAB;
Sheep; artificial insemination; semen; endoscope; pregnancy;
cervix; vagina
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Last Updated 03-05-1997
