Genetic parameters for milk coagulation properties in Estonian Holstein cows

Journal of Dairy Science
M VallasE Pärna

Abstract

The objective of this study was to estimate heritabilities and repeatabilities for milk coagulation traits [milk coagulation time (RCT) and curd firmness (E(30))] and genetic and phenotypic correlations between milk yield and composition traits (milk fat percentage and protein percentage, urea, somatic cell count, pH) in first-lactation Estonian Holstein dairy cattle. A total of 17,577 test-day records from 4,191 Estonian Holstein cows in 73 herds across the country were collected during routine milk recordings. Measurements of RCT and E(30) determined with the Optigraph (Ysebaert, Frepillon, France) are based on an optical signal in the near-infrared region. The cows had at least 3 measurements taken during the period from April 2005 to January 2009. Data were analyzed using a repeatability animal model. There was substantial variation in milk coagulation traits with a coefficient of variation of 27% for E(30) and 9% for the log-transformed RCT. The percentage of variation explained by herd was 3% for E(30) and 4% for RCT, suggesting that milk coagulation traits are not strongly affected by herd conditions (e.g., feeding). Heritability was 0.28 for RCT and 0.41 for E(30), and repeatability estimates were 0.45 and 0.50, respect...Continue Reading

References

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Citations

Oct 4, 2012·Animal : an International Journal of Animal Bioscience·G LeitnerG Katz
Jun 28, 2011·Journal of Dairy Science·G BittanteM De Marchi
Jan 28, 2012·Journal of Dairy Science·H HarziaU Soomets
Oct 2, 2012·Journal of Dairy Science·G BittanteA Cecchinato
Nov 29, 2011·Journal of Dairy Science·G Bittante
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May 15, 2015·Genetics, Selection, Evolution : GSE·Francesco TiezziChristian Maltecca
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Nov 3, 2016·Animal : an International Journal of Animal Bioscience·A PuleddaN P P Macciotta
Feb 18, 2019·Journal of Dairy Science·Nicolò AmalfitanoGiovanni Bittante
Sep 30, 2019·Journal of Dairy Science·A SoufleriG E Valergakis
Jun 3, 2017·Journal of Dairy Science·G VisentinD P Berry

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