| Factors affecting days open, gestation length, and calving interval in Florida dairy cattle. | |
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MedLine Citation:
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PMID: 1541737 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Effects of several factors on reproductive performance were evaluated. Mean performance and number of observations were for days from parturition to first service, 93 and 7730; days from first to successful service, 35 and 11,751; days open, 123 and 8571; gestation length, 280 and 13,612; and calving interval, 400 and 8524. Data covered 52 yr during which no detectable trends in calving interval occurred; other variables changed slightly. Jerseys had 8 fewer d from parturition to first service, 16 fewer d from first service to conception, 8 fewer d open, and 8-d shorter calving intervals than did Guernseys and Holsteins, which did not differ. Cows freshening in warm rather than cool weather suffered by 7, 7, 12, and 13 d for these variables. Repeatabilities ranged from .05 to .12; heritabilities were .05 and .06. Nonmaternal estimate of heritability of gestation length was .22. Phenotypic and genetic correlations between days from parturition to first service and calving interval were .48 and .87; for days open and calving interval, they were .97 and .96. Although days from first to successful service were essentially uncorrelated with days open and calving interval phenotypically (.05), genetic correlations were greater than 1.0 and estimated as unity. Results show no discrepancy between estimates for measures of reproductive performance in a subtropical environment and numerous studies in temperate areas. Large studies from subtropical areas are sparse; essentially none concerns long-term trends. |
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Authors:
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H M Silva; C J Wilcox; W W Thatcher; R B Becker; D Morse |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of dairy science Volume: 75 ISSN: 0022-0302 ISO Abbreviation: J. Dairy Sci. Publication Date: 1992 Jan |
Date Detail:
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Created Date: 1992-04-08 Completed Date: 1992-04-08 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 288-93 Citation Subset: IM |
Affiliation:
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Dairy Science Department, University of Florida, Gainesville 32611. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Breeding* Cattle / genetics, physiology* Climate* Female Fertilization / genetics, physiology Florida Genotype Hot Temperature / adverse effects Lactation Least-Squares Analysis Male Phenotype Pregnancy Reproduction / genetics, physiology* Seasons Sex Factors |
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