Reproductive Biology of the Booroola Merino Sheep
نویسندگان
چکیده
منابع مشابه
Lifetime Reproductive Performance of Booroola Merino X Romney Ewes of Differing Genotype for the Booroola Fecundity Gene and Romney Ewes
First cross Booroola Merino x Romney (B x R) ewes born in 1975, 1976, 1978 and 1979 were classified as being heterozygous (F+) or non carriers (++) for the Booroola fecundity gene. Their performance as hoggets (< 1 year of age) I and to six years of age (1975 and 1976 bornonly) was compared with contemporary Romney (R) ewes. As hoggets, the F+ ewes had ovulation rates about 0.5 higher than ++ B...
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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...
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introduction one of the most important sources of the red meat in iran is the meat produced from sheep. increasing lamb per ewe considered as a strategy for improving the efficiency for sheep production, although reproduction traits have low heritability. several genes associated with reproduction were investigated in the recent years. the bmp 15 gene and its paralog gdf 9 and receptor, bmpr-ib...
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In fine-wool Merino ewes, immunisation against a mixture of steroids was compared with androstenedione immunisation alone and with no treatment to evaluate its long term effectiveness in improving reproductive performance by increasing fecundity. Using 2 prototype multi-steroid vaccines in field trials conducted for 4 consecutive years, gains in lambing percentage were consistently obtained, wi...
متن کاملReproductive performance of commercial Merino, Dohne Merino and SA Mutton Merino flocks in the Southern Cape
Data of 23 189 Merino ewes (8 farms), 7692 Dohne Merino ewes (3 farms) and 2399 SA Mutton Merino ewes (1 farm) were recorded for the 1988-1991 lambing seasons. The udders of ewes present at lamb marking were inspected to differentiate between barren (unlambed), lambed and lost (lambed ewes suckling no progeny), and wet (lambed and suckling ~ 1 lamb) ewes, using the 'wet and dry' technique. The ...
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ژورنال
عنوان ژورنال: Australian Journal of Biological Sciences
سال: 1984
ISSN: 0004-9417
DOI: 10.1071/bi9840163