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The aim of the study was to compare the milk performance, age of first calving and inter-calving interval in Holstein-Friesian black and whites imported from Sweden with domestic cows of the same breed. We also evaluated the process of birth of tested animals and body weight of newborn calves. Domestic cows were more productive and obtained better PFC (the difference between fat and protein content)...
The aim of this study was the comparison of yield, composition and quality of cow milk depending on twice-a-day and four-times-a-day milking. The research was performed on Polish Holstein-Friesian cows of Black-and-White. It was found that milking frequency affected milk yield and composition. A higher daily milk yield was observed in winter, spring and summer for the four-times-a-day milking. Significant...
The aim of the study was to compare RedAngus and Hereford primiparous cows based on the age at first calving and body weight as well as to compare some indices of fertility, lactation yield and selected zoometrical measurements. The research was conducted on the farm located in theWest Pomerania Province. The age at first calving (AFC) and the variability of body weight were similar for both breeds...
The aim of this study was to compare pure-bred Limousine cattle with their crossbreds with Black-and-White breed in regard to the selected zoometrical measurements, selected fertility indices as well as birth weight of calves and their daily body weight gains. The research was conducted on the Czarnocin organic farm located in theWest Pomerania Province. Purebred cows were characterized by a higher...
The study involved 102 Holstein-Friesian cows imported from Sweden, kept on a farm in the West Pomerania Province. Beta-lactoglobulin (LGB) genotypes were determined using PCR (Polymerase Chain Reaction) method according to Medrano andAquilar-Cordova [1990]. It was found that cows with the LGB AA genotype had the highest milk yield in all analysed 305-day lactations. The differences were significant...
The investigations were carried out in a sheepfold located in the Pomeranian Province, Poland. Sheep were evaluated in terms of reproduction traits of ewes, nursing success, and the weight at birth of their lambs. The herd achieved a generally high level of reproduction traits, similar to reference values for the breed published by the Polish Sheep BreedingAssociation for the years 2005–2009. The...
Celem pracy było porównanie produkcyjności krów rasy hf importowanych ze Szwecji i Niemiec. Ocenie poddano również przebieg porodów badanych zwierząt w zależności od płci i masy ciała cieląt przy urodzeniu. Badania przeprowadzono w gospodarstwie zlokalizowanym w województwie zachodniopomorskim. Krowy importowane ze Szwecji uzyskały istotnie (P ≤ 0,01) wyższą wydajność mleka w pierwszej 305-dniowej...
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