Przeglądaj wg Autor "Kolenda, Magdalena"

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    Changes in milking intervals following automatic milking system installation in selected dairy cattle herds in Poland
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2017) Sitkowska, Beata; Aerts, Joanna; Piwczyński, Dariusz; Wójcik, Piotr; Kolenda, Magdalena; Department of Genetics and General Animal Breeding, University of Science and Technology, Bydgoszcz; Lely East Ltd, Lisi Ogon; Department of Genetics and General Animal Breeding, University of Science and Technology, Bydgoszcz; Department of Animal Genetics and Breeding, National Research Institute of Animal Production, Balice near Krakow; Department of Genetics and General Animal Breeding, University of Science and Technology, Bydgoszcz
    Only a limited number of studies looking into the impact of milking intervals on milk yield in cows milked in automatic milking system (AMS) have been conducted. The purpose of this study was to analyse changes in milking intervals in selected dairy cattle herds over a period of 2 years following AMS installation. The material for the present study was collected in Poland from three dairy farms with Polish Holstein-Friesian cattle. Information concerning milking frequency, milking intervals, and milk yield was collected. The database on which statistical tests were performed 48.160 records. The relationship between herd membership and the time that elapsed since the installation of the robot was investigated using the chi-square test of independence. It was found that over the studied period of time the number of milkings per day changed. The lowest number of milkings was recorded in the initial period following AMS installation, when animals were still adapting to AMS. This study established that, regardless of herd and group of cows (primiparous or multiparous) the largest number of voluntary visits to the milking robot occurred 6–9 hours after the last visit, with 50% of cows using the robots during that interval. In all periods under study, the highest milking frequency (3.12–3.18) was reported in the herd with the smallest average milk yield per milking.