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In the paper the influence of daily milk yield in peak lactation, milk yield during 305 days after calving and number of cows’ calving on frequency of lactations longer than 305-day standard were analyzed. It was also estimated the influence of extended lactation on milk yield and milk composition. The research were carried out in a herd including 220 Polish Holstein-Friesian cows of Black-And-White...
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 research material consisted of 101 primiparous cows born from Chaloraise sires. Cows were divided into four genotype groups: 1) pure-bred Charolaise, 2) crossbreds with 75% Charolaise and 25% Black-and-White, 3) crossbreds with 50% Charolaise and 50% Black-and- -White, 4) crossbreds with 50% Charolaise and 50% Simmental.An analysis of the body weight of primiparous cows and calves at weaning was...
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)...
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