ORIGINAL PAPER
Genetic parameters for lactose percentage in the milk
of Polish Holstein-Friesians
1 |
Agricultural University of Krakow, Department of Genetics and Animal Breeding,
Al. Mickiewicza 24/28, 30-059 Kraków, Poland |
2 |
Warsaw Agricultural University, Department of Animal Breeding and Production,
Cattle Breeding Division,
Nowoursynowska 166, 02-787 Warszawa, Poland |
J. Anim. Feed Sci. 2012;21(2):251–262
Publication date: 2012-06-18
KEYWORDS
ABSTRACT
Genetic parameters for lactose percentage in the milk of Polish Holstein-Friesian cows were
estimated using 48,859 test day records from six lactations of 8,418 cows and the Gibbs sampling
method. The multiple-trait random regression model was applied for data from the first and
subsequent (up to the sixth) lactations treated as two traits.
Variance components and heritabilities changed in a similar way through the first and subsequent
lactations, reaching the highest values at peripheries and relatively stable values in the middle of
lactations. All estimates were smaller in the first than in the later parities. Heritabilities of daily
lactose percentage ranged from 0.17 to 0.31 with a mean of 0.24 (SD=0.034), and from 0.23 to 0.36
with a mean of 0.28 (SD=0.026) in first and subsequent lactations. Genetic correlations for lactose
percentage between the same days of the first and subsequent parities were less than 0.30, with the
average equal to 0.26 (SD=0.047) and the minimum (less than 0.15) occurring in the first days after
calving.
CORRESPONDING AUTHOR
E. Ptak
Agricultural University of Krakow, Department of Genetics and Animal Breeding,
Al. Mickiewicza 24/28, 30-059 Kraków, Poland
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