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 119
- Downloads 0
The effect of training on plasma L-carnitine metabolism in purebred Arabian horses
The aim of this study was to evaluate how training affects plasma total, free and esterified L-carnitine concentrations in horses. The study was done on a total of 32 healthy, trained purebred Arabian horses. The 32 hors...
Resveratrol affects the lipid profile but not antioxidant enzymes gene expression in rats fed hypercholesterolaemic diet
The objective of this study was to evaluate the effect of adding resveratrol (RSV) to a hypercholesterolaemic diet on the lipid profile, activity of antioxidant enzymes and their mRNA gene expression, as well as lipid co...
Peripheral ghrelin inhibits feed intake through hypothalamo-pituitary-adrenal axis-dependent mechanism in chicken
It is known that centrally injected ghrelin is an anorexigenic peptide in chicken. Its activity is not mediated by NPY/AgRP - producing neurons but through the corticosterone releasing hormone (CRH) - expressing neurons...
Effects of dietary phytic acid on digestibility of main nutrients and mineral absorption in mink (Mustela vison)
The objective of the study was to evaluate the effects of dietary phytic acid (IP6) on the apparent total tract digestibility (ATTD) of main nutrients and apparent absorption of minerals in mink (Mustela vison). A basal...
Genetic evaluation of the growth of beef bulls at a performance test station
Genetic evaluation of the growth of bulls at a performance test station was performed using a single-trait model (STAM) and multi-trait models that included pre-weaning growth. The growth of the bulls was represented by...