The research was conducted in the Kujawsko-Pomorskie voivodship. The study material consisted of 103 cows of the Polish Holstein-Friesian breed black and white (phf, cb), considering selected breeding parameters: age of ...

The aim of the study was to compare profitability of raw milk production in two herds, one of Jersey cows (J) and the other of Polish Holstein-Friesian Black-and-White cows (PHF), owned by the same economic entity. In ...

The aim of this study was to compare breeding performance traits (in heifers) and milking performance (primiparous cows) of the Polish Holstein-Friesian Black-and-White breed (HO) with those of the Polish Holstein-Friesian ...

The aim of the study was to analyze the single nucleotide substitution polymorphism (SNP) located in exon 9 (1079 G>T, rs471862956) of the gene encoding nucleobindin-2 (NUCB2) in relation to milk production traits such ...

The study involved 859 Polish Holstein-Fresian var. Black-and-White cows. The kappa-casein (CASK) genotypes were determined using PCR (Polymerase Chain Reaction) method. It was found that allele of CASKA had occurred ...

The aim of this study was to characterise basic reproduction indexes and to investigate the effect of selected factors on values of analysed fertility parameters in cows (100 head) with record lifetime milk yields. The ...