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Genetic Analysis of Milk Fat Globule and Casein Micelle Size in Canadian Holsteins

Tuesday, August 19, 2014
Posters (The Westin Bayshore)
Allison Fleming , Centre for Genetic Improvement of Livestock, University of Guelph, Guelph, ON, Canada
Astrid Koeck , Centre for Genetic Improvement of Livestock, University of Guelph, Guelph, ON, Canada
Filippo Miglior , Center for Genetic Improvement of Livestock, University of Guelph, Guelph, ON, Canada
Milena Corredig , Dept Food Science, University of Guelph, Guelph, ON, Canada
Jin Chen , Dept Food Science, University of Guelph, Guelph, ON, Canada
Bonnie Mallard , Dept of Pathobiology, OVC, University of Guelph, Guelph, ON, Canada
Ayesha Ali , Dept of Mathematics and Statistics, University of Guelph, Guelph, ON, Canada
Flavio S Schenkel , Centre for Genetic Improvement of Livestock, University of Guelph, Guelph, ON, Canada
Abstract Text: A total of 1,046 milk samples from 188 Canadian Holstein cows were analyzed for mean milk fat globule size and casein micelle size. Milk fat globule size was calculated as both as volume moment mean and surface moment mean. High heritabilities were found for both expressions of the trait at 0.57 and 0.50, respectively.  Additionally, a very high genetic correlation of 0.94 was found between the volume and surface moment means. A heritability of 0.29 was found for casein micelle size. Positive genetic correlations between casein micelle size and milk fat globule volume and surface moment means of 0.16 and 0.11, respectively, were found. The genetic parameters found for the traits examined indicate a genetic component to their size and selection may be possible.

Keywords: Dairy cattle, Milk fat globule, Casein micelle

See more of: Posters: Dairy Cattle Breeding (Group 3)
See more of: Species Breeding: Dairy cattle
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