Factors affecting the age at onset of puberty, ovulation rate and time of ovulation in Chinese Meishan gilts
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چکیده
منابع مشابه
Ovulation rate and embryonic survival in Chinese Meishan and white crossbred pigs.
Two component traits of litter size of pigs, ovulation rate and embryonic survival, were examined in Meishan and composite white crossbred gilts and sows. At puberty, an ovulation rate of 12.5 was similar for Meishan (118 +/- 3 d of age) and crossbred gilts (217 +/- 3 d of age). The number of corpora lutea (CL) increased (4.3 CL) markedly (P < .01) from puberty to the sixth estrous period (220 ...
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Effect of time of ovulation and sperm concentration on fertilization rate in gilts.
In normal production practices, sows and gilts are inseminated at least twice during estrus because the timing of ovulation is variable relative to the onset of estrus. The objective of this study was to determine if a normal fertilization rate could be achieved with a single insemination of low sperm number given at a precise interval relative to ovulation. Gilts (n=59) were randomly assigned ...
متن کاملFactors regulating ovulation rate in the ewe.
Our knowledge of ovulation rate is still very rudimentary, but that is not to say that little information is available. The literature contains a vast body of data on the subject (Cumming, 1977) but a general model, such as those that are now widely accepted for the control of the oestrous cycle (Baird & McNeilly, 1981) or of seasonal reproduction (Goodman & Karsch, 1981), is not available. The...
متن کاملEndocrine changes and management factors affecting puberty in gilts
Puberty in gilts is the occurrence of first oestrus and the onset of reproductive capability (usually at between 200 and 220 days of age). It is the combined effect of genetic factors and management factors (including nutrition, boar exposure and season) that contribute to the age at puberty. Consumer demands for leaner pork have lead to genetic selection for increased lean tissue growth rate a...
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ژورنال
عنوان ژورنال: Reproduction
سال: 1994
ISSN: 1470-1626,1741-7899
DOI: 10.1530/jrf.0.1000353