Wydanie 336(43)3 2017

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https://oa.zut.edu.pl/handle/20.500.12539/702

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    Production parameters of PHF cows depending on varying housing conditions during lactation
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2017) Mróz, Piotr; Wójcik, Piotr; Cwynar, Marzena; Department of Animal Genetics and Breeding, National Research Institute of Animal Production Krakow; Department of Animal Genetics and Breeding, National Research Institute of Animal Production Krakow; KR Kietrz Ltd., Kietrz
    The aim of the study was to determine the effect of varying housing conditions on production parameters of Polish Holstein-Friesian cows. The animals from the Experimental Station of the National Research Institute of Animal Production in Chorzelow were divided into three groups differing in housing conditions. The differentiating variables were access to outdoor areas and area per animal. Cows were also subjected to changes in stocking density and regrouping. The results showed that among cows without outdoor access, those with a space allowance of 3.8 m2/cow produced 2 kg less milk than those with a floor space of 7.74 m2/cow. Increasing stocking density from 3.8 to 2.71 m2/head reduced milk production by 8.9 kg. In cows with outdoor access, decreasing floor space allowance from 7.74 to 5.35 m2/head reduced milk production by 7.46 kg. Two changes in the living area, including increased floor space (in another group) from 6.24 to 17.6 m2 also caused milk yield to decrease by 6 kg. The decreases in milk yield increased the solids content per litre of milk. The study found that housing system and stocking density determine the level of milk production. Too frequent changes in stocking density, as well as regroupings have a negative effect on milk yield.