Izvorni znanstveni članak
https://doi.org/10.5513/JCEA01/16.3.1616
Relationship between primiparas first 100-days lactation and their lifetime milk production in Polish Holstein-Friesian Cattle
Beata SITKOWSKA
; Department of Genetics and General Animal Breeding, Faculty of Animal Breeding and Biology,UTP University of Science and Technology in Bydgoszcz, Poland
Dariusz PIWCZYŃSKI
; Department of Genetics and General Animal Breeding, Faculty of Animal Breeding and Biology,UTP University of Science and Technology in Bydgoszcz, Poland
Zbigniew LACH
; Pedigree Breeding Centre in Osięciny, Poland
Magdalena KOLENDA
; Department of Genetics and General Animal Breeding, Faculty of Animal Breeding and Biology,UTP University of Science and Technology in Bydgoszcz, Poland
Sažetak
The aim of this study was to identify the relationship between the lifetime
performance of cows and their performance during the first 100 days of lactation. The
studied material consisted of breeding documentation for 2,347 Holstein-Friesian
cows, that were used for milk production between 1995 and 2010, in the Pedigree
Breeding Centre in Osięciny. Such parameters as milk yield, fat (kg, %) and protein
content (kg, %) were taken into consideration while analysing the results for the first
100 days of lactation and the lifetime milk performance. The study included only
animals that had already been culled. Results indicate that the factors affecting the
primiparas milk production during the 100-day lactation are as follows: herd, year and
season of first calving as well as the age at first calving. It was proven that the
sources of variation in the lifetime performance, in terms of the milk yield, fat and
protein content, were: herd, year of first calving, age at first calving and the level of
milk yield during the first 100 days of primiparas lactation. It was observed that the
season of first calving did not significantly affect milk performance traits throughout
the cows productive life. The calculated correlation coefficients, mainly of weak
relationship between levels of the lifetime performance and the 100-day performance,
showed a moderate positive correlation between the percentage content of fat and
protein in milk in both periods.
Ključne riječi
age at first calving; lifetime performance; predicting; primiparas
Hrčak ID:
145110
URI
Datum izdavanja:
15.9.2015.
Posjeta: 1.708 *