number of spermatozoa, the number of ovulations per ewe, and immunization against androstenedione affect fertility and prolificacy of sheep

Ewes that were untreated, fed lupins or fed lupins and immunized against androstenedione were artificially inseminated. The percentage of ewes pregnant at 36–45 days after insemination (fertility) was 8% higher in ewes that had more than one ovulation than in those that had only one ovulation. Maxim...

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Published inJournal of reproduction & fertility Vol. 84; no. 1; pp. 43 - 50
Main Authors Cameron, A.W.N, Oldham, C.M, Fairnie, I.J, Keogh, E.J, Lindsay, D.R
Format Journal Article
LanguageEnglish
Published England Society for Reproduction and Fertility 01.09.1988
Subjects
androgens
Androstenedione - physiology
Animals
artificial insemination
embryo (animal)
ewes
Female
Fertility
Fetal Death
Insemination, Artificial - veterinary
Male
mortality
Ovulation
Pregnancy
Sheep
spermatozoa
Spermatozoa - physiology
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Summary:Ewes that were untreated, fed lupins or fed lupins and immunized against androstenedione were artificially inseminated. The percentage of ewes pregnant at 36–45 days after insemination (fertility) was 8% higher in ewes that had more than one ovulation than in those that had only one ovulation. Maximum fertility was achieved with 50 × 10 6 spermatozoa and this did not vary with the number of ovulations that ewes had. Among the pregnant, twin-ovulating ewes, embryo survival increased as the number of spermatozoa inseminated increased from 25 × 10 6 to 400 × 10 6 . Immunization of ewes against androstenedione increased ovulation rate but reduced fertility, and reduced embryo survival among twin-ovulating ewes. Keywords: artificial insemination; ovulation rate; fertility; androstenedione; embryo survival; sheep
ISSN:0022-4251
1470-1626
1741-7899
DOI:10.1530/jrf.0.0840043