Short communication: influence of composite casein genotypes on additive genetic variation of milk production traits and coagulation properties in Holstein-Friesian cows

Journal of Dairy Science
M PenasaG Bittante

Abstract

The aim of the study was to quantify the effects of composite beta- and kappa-casein (CN) genotypes on genetic variation of milk coagulation properties (MCP); milk yield; fat, protein, and CN contents; somatic cell score; pH; and titratable acidity (TA) in 1,042 Italian Holstein-Friesian cows. Milk coagulation properties were defined as rennet coagulation time (RCT) and curd firmness (a(30)). Variance components were estimated using 2 animal models: model 1 included herd, days in milk, and parity as fixed effects and animal and residual as random effects, and model 2 was model 1 with the addition of composite beta- and kappa-CN genotype as a fixed effect. Genetic correlations between RCT and a(30) and between these traits and milk production traits were obtained with bivariate analyses, based on the same models. The inclusion of casein genotypes led to a decrease of 47, 68, 18, and 23% in the genetic variance for RCT, a(30), pH, and TA, respectively, and less than 6% for other traits. Heritability of RCT and a(30) decreased from 0.248 to 0.143 and from 0.123 to 0.043, respectively. A moderate reduction was found for pH and TA, whereas negligible changes were detected for other milk traits. Estimates of genetic correlations were...Continue Reading

References

Dec 11, 1990·Nucleic Acids Research·D W Threadgill, J E Womack
Dec 11, 1990·Nucleic Acids Research·L FerrettiV Sgaramella
Nov 16, 2006·Journal of Dairy Science·T M Schmit, H M Kaiser
Oct 4, 2008·Journal of Dairy Science·M De MarchiM Cassandro

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Citations

Sep 25, 2012·The Journal of Dairy Research·Denis PrettoMartino Cassandro
Oct 4, 2012·Animal : an International Journal of Animal Bioscience·G LeitnerG Katz
May 9, 2014·Animal : an International Journal of Animal Bioscience·A CecchinatoG Bittante
Aug 26, 2014·Journal of Dairy Science·A SturaroM De Marchi
Jan 21, 2014·Journal of Dairy Science·M De MarchiM Penasa
May 6, 2016·Frontiers in Genetics·Sandrine I DucheminWillem F Fikse
Jun 28, 2011·Journal of Dairy Science·G BittanteM De Marchi
Oct 29, 2011·Journal of Dairy Science·M J M RuttenJ A M van Arendonk
Oct 2, 2012·Journal of Dairy Science·G BittanteA Cecchinato
Nov 29, 2011·Journal of Dairy Science·G Bittante
Feb 16, 2015·Journal of Dairy Science·N A PoulsenL B Larsen
May 15, 2015·Genetics, Selection, Evolution : GSE·Francesco TiezziChristian Maltecca
Jan 15, 2015·Journal of Dairy Science·Angela GuidoneEugenio Parente
Dec 18, 2013·Tropical Animal Health and Production·Gaspar Manuel Parra-BracamonteLuis Alberto Meza-Garcia

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