Freemartinism in replacement ewe-lambs of the Ripollesa sheep breed
نویسندگان
چکیده
منابع مشابه
The incidence of freemartinism in sheep.
The freemartin heifer, a sterile female twin to a bull calf, has been known to cattle farmers for centuries. Lillie (1916, 1917) and Tandler & Keller (1911) established that the anastomosis which forms between the placentae of the twins allows hormones from the male to masculinize the indifferent gonad of the female twin. At this time, it was uncertain whether or not the condition occurred in s...
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Breed, heterosis and environmental influences on growth and puberty in ewe lambs.
A study involving 825 spring ewe lambs was conducted to evaluate effects of breed, heterosis, type of birth and rearing, age of dam and preweaning and postweaning growth rate on occurrence of puberty before November 10. Within a breed or breed-cross, preweaning competition among twin and triplet lambs reduced lamb weights by 4 or 5 kg at 70 (weaning), 160 and 230 days of age and by about 3 kg a...
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The aim of this study was to determine the effect of ewe breed on the reaction time and semencharacteristics in the ram. For this purpose, from the native sheep breeds in Iran, seven Lory rams and fourewes (two Lory and two Ghezel breeds) were selected. Seven rams were individually subjected to 4 weeklytrials in which one of the following two treatments was applied alternately. All of rams were...
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ژورنال
عنوان ژورنال: Journal of Veterinary Science
سال: 2018
ISSN: 1229-845X,1976-555X
DOI: 10.4142/jvs.2018.19.6.858