Sire origin as well as age and body weight of heifers at fertilization were shown to have a statistically significant effect on freshening milking efficiency in Polish Holstein-Friesian Black- -and-White primiparous cows. ...

Modern farming asks many questions which science has answers to. While selecting animals for further breeding, many aspects should be taken under consideration, like an animal's phenotypic and genetic features. Marker-assisted ...

Decrease in productive longevity of dairy cows in conditions of industrial dairy complexes causes another problem, which is connected with the timely replenishment of the herd with calves for replacement. Therefore, the ...

The aim of study was to evaluate the influence of using EMTM probiotics in dairy cattle feeding on production and reproductive performance and birth weight of calves. The present investigation was undertaken at a large ...

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 ...