Wydanie 338(44)4 2017

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https://oa.zut.edu.pl/handle/20.500.12539/701

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    Effect of age at first calving and calving interval lenght on milk performance in cows
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2017) Czerniawska-Piątkowska, Ewa; Nagórska, Oliwia; Department of Ruminant Science, West Pomeranian University of Technology, Szczecin; Department of Ruminant Science, West Pomeranian University of Technology, Szczecin
    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 first calving (WPW) and intermittent period (OMW). Data on milk yield and selected reproductive parameters were obtained from the farm documentation of the farm using the results of the evaluation of the dairy cattle use value carried out by PFHBiPM. Milk yield of cows was assessed based on milk yield, fat and protein [kg] and content [%] of these components in milk. When analysing the intercurrent period of cows, significant differences (P ≤ 0.05) were observed between the examined animal groups. The highest milk yield (8481 kg) and fat yield (355 kg) reached cows in the second lactation, with an interval greater than 471 days.