Effects of some non-genetic factors on concentration of urea in milk in Polish Holstein-Fresian cows
Journal Title: Journal of Animal and Feed Sciences - Year 2013, Vol 22, Issue 3
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.
Authors and Affiliations
K. Rzewuska, T. Strabel
Keywords
Related Articles
- EP ID EP72977
- DOI -
- Views 131
- Downloads 0
Molecular characterization, polymorphism and association with reproductive traits of porcine CDK20 gene
The complete coding sequence of one pig gene, CDK20, was amplified by RT-PCR. Sequence analysis revealed that the porcine CDK20 gene encodes a protein of 343 amino acids which has high homology with the cyclin-dependent...
Effects of dietary bamboo charcoal powder including vinegar liquid on chicken performance and histological alterations of intestine
Forty-eight 154-d-old White Leghorn hens were fed a diet containing 0 (control), 0.5, 1.0 and 1.5% bamboo charcoal powder including vinegar liquid (SB). Compared with the control group, production performance in the SB g...
Modeling lactation curves of Polish Holstein-Friesian cows. Part II: Prediction of 305-d lactation milk, fat and protein yields
The objective of the study was to compare five lactation curve models, Ali and Schaeffer, Guo, Wilmink, and third- and fourth-order normalized Legendre polynomials, for their ability to reliably predict 305-d lactation y...
The effect of particle size of full-fat rapeseed and of multi-carbohydrase enzyme supplementation on nutrient digestibility and performance in broilers
The aim of the study was to investigate the effect of the particle size of full-fat rapeseed and of multi-carbohydrase enzyme supplementation on chicken performance. The experiment was conducted with 480 male broiler chi...
Effect of Tremella fuciformis ferment substance on the growth performance and lipid metabolism of finishing pigs
An experiment was conducted to study the effects of Tremella fuciformis ferment substance (TFS) supplementation in diets on the growth performance, fat deposition, blood lipids, and mRNA expression of lipid storage-relat...