0.857
IF5
0.900
IF
Q3
JCR
0.92
CiteScore
0.405
SJR
Q2
SJR
20
MNiSW
165.24
ICV
ORIGINAL PAPER
 
CC-BY 4.0
 
 

Genetic parameters of milk fat-to-protein ratio in first three lactations of Polish Holstein-Friesian cows

A. Satoła 1  ,  
 
1
University of Agriculture in Krakow, Faculty of Animal Science, Department of Genetics and Animal Breeding, al. Mickiewicza 21, 31-120 Krakow, Poland
J. Anim. Feed Sci. 2019;28(2):97–109
Publish date: 2019-04-12
KEYWORDS
TOPICS
ABSTRACT
The aim of the study was to estimate the genetic parameters of milk fat-to-protein ratio in the first three lactations of Polish Holstein-Friesian cows. Data included 104 875 test-day records of 6299 cows calving from years 2000–2012. Genetic parameters were estimated with a multitrait random regression model using the Bayesian method via Gibbs sampling. The linear model for fat-to-protein ratio and milk traits (milk yield, lactose percentage, milk urea concentration) included fixed herd-test-day effect, fixed regressions within age at calving by season of calving subclasses, and random regressions for additive genetic and permanent environmental effects. All regressions were modelled using fourth-order Legendre polynomials. The average daily heritability of fat-to-protein ratio ranged from 0.24 to 0.31. Fat-to-protein ratio was negatively genetically correlated with milk yield for almost every day in milk in each lactation, with means of −0.52, −0.24 and −0.05 in the first, second and third lactations, respectively. Average genetic correlations of fat-to-protein ratio with lactose percentage and milk urea concentration were rather low or close to zero (−0.08 to 0.10) except for the genetic correlation with milk urea content in the second lactation (0.32). The results suggest that fat-to-protein ratio is a heritable trait and might be used in the selection of Polish Holstein-Friesians assuming that the relationship between fat-to-protein ratio and economically important traits will be investigated.
CORRESPONDING AUTHOR
A. Satoła   
University of Agriculture in Krakow, Faculty of Animal Science, Department of Genetics and Animal Breeding, al. Mickiewicza 21, 31-120 Krakow, Poland
 
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ISSN:1230-1388