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In the future an approach incorporating cows’ measured phenotypes and marker genotypes of cows and bulls within a single model can be applied. The most important advantage of such a model is the simultaneous use of pedigree and marker-based genomic relationship data. Such a solution allows the use of both genotyped and non-genotyped animals in the prediction procedure. This pilot study is aimed towards...
An attempt was made at identifying the activity of acid phosphatase (AcP) and β-Nacetylhexosaminidase (Hex) in the whole raw milk of cows maintained on ecological farm and over the autumn/winter and spring/summer seasons (AW and SS season, respectively) fed with typical feeding rations. Both enzymes play a crucial role in animals’ metabolism, affect the technological properties of milk and are indicators...
Considered were four dairy farms. Two were certified organic farms and two were conventional – one with intensive and one with extensive production system. Observations were conducted on 10 Holstein-Friesian (HF) cows from each farm while from conventional farm with extensive production additional 10 Polish Red (PR) cows were observed. Samples of milk and hair for determination of minerals were collected...
Associations were studied between the polymorphic forms of bovine β4-defensin gene and milk traits in cows during the standard (305 days) and the whole lactation. The study was carried out In the years 2004-2007 on 207 Holstein-Friesian cows yielding on the average 9600 kg milk/year. The animals were in their first to fifth lactation, maintained in loose barn and fed ad libitum with TMR (total mixed...
In the experiment involved 186 milk samples obtained from cow udder quarters at different state of mastitis. Milk derived from infected udder quarters was characterised by a statistically significant higher total protein percentage share and a higher pH value (p£ 0.05) by a lower lactose (p£ 0.01) and casein content (p£ 0.05) than milk of healthy quarters. The content of solids not fat indicated the...
Because of the antimicrobial role that defensins play in humans and animals, genes encoding these peptides may be considered as molecular markers of a genetically determined susceptibility (or resistance) of the mammary gland to mastitis. Records were gathered of daily milk yield, fat, protein, and lactose content of milk, and milk somatic cell count (SCC) of 217 lactating Black-and-White cows. To...
Neospora caninum, an apicomplexan protozoan causes economical losses due to reproductive failure associated with abortion among cattle. The diagnosis of neosporosis is difficult, due to nonspecific clinical signs and there are no parasitological examinations which can help to recognise neosporosis in vivo. Milk of seropositive cows was examined for both, IgG level to antigens of N. caninum and the...
The aim of this study was to evaluate milk hygienic quality and to determine a relationship between season of year and raw milk quality indices. The experiment was carried out on 38 samples of milk collected from 80 highproduction cows managed in a leading cattle breeding centre in southwest Poland. The analysis comprised total bacteria count, somatic cell count in 1 cm3 of milk, chemical composition...
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