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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...
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 aim of this study was to detect heifers with dystocia using artificial neural networks (ANN). A total of 531 calving records of Holstein-Friesian heifers of Black-and-White strain and 8 diagnostic variables were used. The output variable was the class of calving difficulty: difficult or easy. Perceptrons with one (MLP1) and two (MLP2) hidden layers and radial basis function (RBF) networks were...
The study was conducted on two family farms (herdsAand B). The experimental materials comprised Polish Holstein-Friesian cattle raised in 2006–2009. The objective of this study was to compare SCC, the yield and composition of milk from Holstein-Friesian Black-and-White cows kept in the tie-stall and free-stall system for four years. The analysis indicates that cows housed in a tie-stall barn (herdA)...
The aim of this study was to determine the effect of the origin of Holstein-Friesian cows on the yield, concentration of protein fraction components and selected technological parameters of cow’s milk. The fifty Holstein-Friesian cows from Poland, Sweden and Germany were involved in the experiment. The analysis of milk, protein and fat yield showed advantage of cows from Poland over those imported...
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