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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
10
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pubmed:dateCreated |
1989-1-17
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pubmed:abstractText |
Sixteen third-parity sows maintained under two photoperiod treatments (16 h light: 8 h dark [16 h] or 4 h light: 20 h dark [4 h]) were assigned to be unilaterally ovariectomized (left ovary) at weaning on d 28 after farrowing a small litter (12 or fewer piglets; S) or a large litter (more than 12 piglets; L). Antral follicles were classified as atretic or nonatretic and divided into six size classes. The right ovary was obtained at slaughter, 16 d after estrus was detected. Number of antral follicles in the left ovary was greater (P less than .05) for L sows (540) than for S sows (427). Sows exposed to 16 h of light with large litters had a higher number of atretic follicles than all other groups (litter size x photoperiod interaction, P less than .05). Number of nonatretic follicles were similar between groups. However, when nonatretic follicles were classed by size (1 = smallest; 6 = largest), their distribution differed. In Class 1, L sows had more follicles than S sows (P less than .05). For Classes 3 and 4, photoperiod interacted with litter size to decrease the number of follicles in L 16 h sows (litter size x photoperiod interaction, P less than .05). These lower numbers of nonatretic follicles were related to a higher rate of follicular atresia in L 16 h sows. In Classes 2, 3 and 4, L 16 h sows had more atretic follicles than any other group (litter size x photoperiod interaction, P less than .05).(ABSTRACT TRUNCATED AT 250 WORDS)
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0021-8812
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
66
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
2606-13
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:3198540-Animals,
pubmed-meshheading:3198540-Female,
pubmed-meshheading:3198540-Follicular Atresia,
pubmed-meshheading:3198540-Lactation,
pubmed-meshheading:3198540-Light,
pubmed-meshheading:3198540-Litter Size,
pubmed-meshheading:3198540-Ovarian Follicle,
pubmed-meshheading:3198540-Parity,
pubmed-meshheading:3198540-Pregnancy,
pubmed-meshheading:3198540-Swine,
pubmed-meshheading:3198540-Weaning
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pubmed:year |
1988
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pubmed:articleTitle |
Effects of litter size and light regimen imposed during lactation on ovarian follicular population at weaning in third-parity sows.
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pubmed:affiliation |
Université Laval, Québec, Canada.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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