ORIGINAL PAPER
Effects of some non-genetic factors on concentration of urea in milk in Polish Holstein-Fresian cows
K. Rzewuska 1,   T. Strabel 1  
 
More details
Hide details
1
Poznan University of Life Sciences, Faculty of Animal Breeding and Biology, Department of Genetics and Animal Breeding, Wołyńska 33, 60-637 Poznań, Poland
CORRESPONDING AUTHOR
T. Strabel   

Poznan University of Life Sciences, Faculty of Animal Breeding and Biology, Department of Genetics and Animal Breeding, Wołyńska 33, 60-637 Poznań, Poland
Publication date: 2013-09-02
 
J. Anim. Feed Sci. 2013;22(3):197–203
 
KEYWORDS
ABSTRACT
The objective of this study was to estimate lactation curves of milk urea concentration for primiparous Polish Holstein-Friesian cows, milked in different months and air temperatures, using random regression test-day models. In the study, 6 086 431 test-day records collected in the years 2001 to 2009 from 900 962 cows were analysed. Regression curves in classes of environmental effects were modeled with Legendre polynomials. The pattern of lactation curves for milk urea (MU) resembled the lactation curve for milk. In summer and early fall, the MU concentration was higher than in the winter months. At the same time, the increase in the MU concentration was even more strongly associated with the increase of temperature, also in the winter months. In herds with higher milk production, the MU concentration was also higher, however, interaction between average herd milk production and month-temperature was found. A greater influence of month and air temperature was observed in herds with low milk production.
 
CITATIONS (5):
1.
Genetic parameters for milk urea concentration and milk traits in Polish Holstein-Friesian cows
Katarzyna Rzewuska, Tomasz Strabel
Journal of Applied Genetics
 
2.
Factors affecting the milk urea nitrogen concentration in Chinese Holstein cows
Huimin Zhang, Mengqi Wang, Hongrui Jiang, Yan Cui, Hailei Xia, Wei Ni, Mingxun Li, Niel A. Karrow, Zhangping Yang, Yongjiang Mao
Animal Biology
 
3.
Seasonal Correlations Between Heat Stability and Other Raw Bulk Cow Milk Quality Indicators
Oto Hanuš, Jindřich Čítek, Jan Říha, Eva Samková, Josef Kučera, Gustav Chládek, Irena Němečková, Lucie Hasoňová, Marcela Klimešová, Petr Roubal, Radoslava Jedelská
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
 
4.
Genetic and environmental determinants of the urea level in cow's milk
A. Czajkowska, B. Sitkowska, D. Piwczyński, P. Wójcik, S. Mroczkowski
Archives Animal Breeding
 
5.
The eff ect of selected factors on urea concentration in the milk of Polish Holstein-Friesian cows
Alicja Satoła, Ewa Ptak
Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego
 
ISSN:1230-1388