Oestradiol Implant Reduces Litter Size in the Booroola Merino
نویسندگان
چکیده
The litter size of homozygous Booroola Merino ewes results in high perinatal mortality. One subcutaneous implant of crystaline oestradiol in silastic tubing in heterozygous Booroola Merino ewes decreased ovulation rate from 3.18 -r0.15 (n = 39) to 2.03 & 0.14 (n = 35), and decreased litter size (5 8 weeks pregnant) from 2.49 + 0.13 (n = 39) to 1.47 + 0.12 (n = 32), providing a useful management tool. In homozygous Booroola Merino ewes ovulation rate decreased from 4.11 +, 0.28 (n = 18) to 2.11 k 0.28 (n = 18). Two implants prevented ovulation in about half of the animals and only 9 of 38 such heterozygous ewes had viable foetuses at 7 weeks.
منابع مشابه
Mutations in BMPR-IB and BMP-15 genes are associated with litter size in Small Tailed Han sheep (Ovis aries).
The Small Tailed Han is a prolific local sheep breed in China. The bone morphogenetic protein receptor IB (BMPR-IB) gene, which affects the fecundity of Booroola Merino sheep, and the bone morphogenetic protein 15 (BMP-15) gene, which affects the fecundity of Inverdale, Hanna, Belclare, Cambridge, and Lacaune sheep, were studied as candidate genes associated with the prolificacy of Small Tailed...
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