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Presented are results of a study on the influence of air temperature and humidity on milk production by 174 Holstein-Friesian cows kept in a free stall barn. Occurrence of heat stress in three technological groups of cows with help of temperature-humidity index (THI) was specified. The result of heat stress was a decrease in milk yield. There was a strong correlation found (P=0.05) between minimum...
The aim of this study was to investigate the relationship between the loss in body condition score (BCS) and loss (ΔBCS), energy balance (EB), hepatic lipidosis and blood serum concentration of non esterified fatty acids (NEFA), glucose, triacylglycerol (TAG) and total bilirubin (tBIL) in healthy dairy cows during transition period. Twenty healthy Holstein cows were included and categorized into groups...
In order to evaluate the expression of sire genetic evaluations obtained in North America for Chilean Black and White Cattle, genetic correlations were estimated for milk (MY), fat (FY) and protein (PY) yields, and for fat (F%) and protein (P%) contents between Chile, Canada and the US, from predicted transmitting abilities of common sires in two countries. Moreover, genetic correlations for the same...
The study aimed at evaluation the effect of mannanoligosaccharides (MOS) and zinc-bacitracin (ZnB) administered continuously (+) or intermittently (+/-) upon growing performance, carcass and meat traits, blood profile and tissue morphology of growing rabbits. One hundred and twenty five, 25 days-old rabbits were distributed among 5 groups fed the same basal diet: the control group did not receive...
Due to the presence and activity of mammary stem cells (MaSC), growth and remodelling of mammary gland during puberty and lactation cycles is possible. In this study the number of putative mammary stem/progenitor cells was examined in 20 months old non-pregnant Holstein-Friesian heifers. Cells were double-stained with fluorescent dye-conjugated antibodies against stem cell antigen-1 (Sca-1) and fibronectin...
The aim of this study was to verify the hypothesis that insertion/deletion (indel) polymorphisms within the promoter and intron 1 sequences of the prion protein (PRNP) gene can affect the breeding value of Holstein-Friesian bulls. The experimental material included 261 Holstein-Friesian bulls born between 1997 – 2002. It was shown that the polymorphism in the intron 1 (12 bp indel) sequence had a...
The aims of this study were to analyse the structure of Polish dairy goat population and to estimate the non-genetic and genetic sources of variation in five milk traits. The data set comprised 18,563 lactation records of 8,938 dairy goats, while the pedigree file covered information on 13,159 animals 6 generations deep. To estimate the environmental effects the GLM procedure, using a model with the...
The main aim of this study was to evaluate the effect of the lactation stage (SL) on the fatty acids (FA) profile of raw milk of Brown Short-haired goats reared under organic regime. An integraf part of the study was also to assess the effect of the SL on the physico-chemical characteristics and somatic cell count (SCC) of milk. Milk records and samplings of each goat were carried out seven times...
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