Wydanie 350(51)3 2019

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Open Access
Effect of Cow Age and Stocking Rate on Milk Output and Milking Duration
(Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2019) Wójcik, Piotr; Meller, Mariusz; Mróz, Piotr; Department of Cattle Breeding, National Research Institute of Animal Production, Kraków, Poland; The Dobrzyniewo Stud Ltd., Poland; Department of Cattle Breeding, National Research Institute of Animal Production, Kraków, Poland
The study was performed with Polish Holstein-Friesian (PHF) cows maintained in changing environmental conditions. Two groups of animals were established (with and without an outside yard), which were subjected to temporary crowding. The effects of age and rate of change in stocking density on milk output and milking duration were also determined. It was found in the study that cow age is a variable highly differentiating the cows in milk yield and milk quality parameters. The change in housing conditions (crowding) reduced milk yield by 8.92 kg in the section without outdoor access and by 7.46 kg in the section with outdoor access. In both experimental groups, milking time decreased with decreasing milk production. Outdoor access alleviated the adverse effects of increased stocking density and reduced stress.