The relation between oestrus signs and probability of ovulation at dubious oestrus in gilts.
نویسندگان
چکیده
منابع مشابه
Control of Oestrus and Ovulation in Cows
Although the methods and techniques that will be used to synchronize follicle growth and ovulation in the future may yet to be discovered, many tools that are needed may already exist. Once synchronous growth of a competent dominant follicle occurs, ovulation can be induced at a predictable time by applying drugs or hormones that induce LH release, or by administration of exogenous LH. Developm...
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Lactation delays the re-initiation of oestrous cyclicity in rats, resulting in physiological sterility for the duration of suckling. During this phase, the secretion of pituitary gonadotrophins is suppressed by an unknown mechanism. Continued application of the suckling stimulus by litter replacement (Bruce, 1958; Nicoll & Meites, 1959), or injections of prolactin (Meites & Nicoll, 1959), have ...
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The pregnancy rate resulting from matings at a single oestrus in beef cattle averages 70% for natural mating (Turman, Laster, Renbarger & Stephens, 1971) and 60% for artificial insemination (Laster, Glimp & Gregory, 1972). The sources and causes of low pregnancy rates have not been defined, but might include variation in time of ovulation relative to deposition of spermatozoa in the female repr...
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The Catalonian donkey breed is in danger of extinction, and much needs to be learned about the reproductive features of its females if breeding and conservation programmes are to be successful. This study reports the oestrous behaviour, oestrus cycle characteristics and dynamic ovarian events witnessed during 50 oestrous cycles (involving 106 ovulations) in 10 Catalonian jennies between March 2...
متن کاملLuteinizing hormone activity in blood and urinary oestrogen excretion by the sow at oestrus and ovulation.
Luteinizing hormone (lh) activity in blood was assessed by the ovarian cholesterol depletion (ocd) method and oestrogens were estimated chemically in the urine of seven sows before and during oestrus. In three sows, peritoneal cannulation permitted the time of ovulation to be related to lh and oestrogen determinations. The findings suggest a marked elevation of blood lh activity coincident with...
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ژورنال
عنوان ژورنال: Netherlands Journal of Agricultural Science
سال: 1989
ISSN: 0028-2928
DOI: 10.18174/njas.v37i2.16647