Document Detail

Association of length of pregnancy with other reproductive traits in dairy cattle.
MedLine Citation:
PMID:  25049473     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The experiment involved observations of 2,514 Holstein-Friesian cows to determine the effects of environmental factors (cow's age, calving season, weight and sex of calves, housing system) and genetic factors on gestation length in dairy cattle and the correlation between gestation length and other reproductive traits (calving ease, stillbirth rates and placental expulsion). Genetic parameters were estimated based on the sires of calved cows (indirect effect) and the sires of live-born calves (direct effect). The following factors were found to contribute to prolonged gestation: increasing cow's age, male fetuses and growing fetus weight. Optimal gestation length was determined in the range of 275-277 days based on calving ease and stillbirth rates. The heritability of gestation length was estimated at 0.201-0.210 by the direct effect and 0.055-0.073 by the indirect effect. The resulting genetic correlations suggest that the efforts to optimize (prolong) gestation length could exert an adverse influence on the breeding value of bulls by increasing perinatal mortality and calving difficulty. The standard errors of the investigated parameters were relatively high, suggesting that any attempts to modify gestation length for the purpose of improving calving ease and reducing stillbirth rates should be introduced with great caution.
Zenon Nogalski; Dariusz Piwczyński
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Asian-Australasian journal of animal sciences     Volume:  25     ISSN:  1011-2367     ISO Abbreviation:  Asian-australas. J. Anim. Sci.     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2014-07-22     Completed Date:  2014-07-22     Revised Date:  2014-07-28    
Medline Journal Info:
Nlm Unique ID:  9884245     Medline TA:  Asian-Australas J Anim Sci     Country:  Korea (South)    
Other Details:
Languages:  eng     Pagination:  22-7     Citation Subset:  -    
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