Wydanie 363(62)2 2022

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https://oa.zut.edu.pl/handle/20.500.12539/1561

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    Analysis of Production and Reproduction Indicator of Polish Holstein-Friesian Cattle Oin Three Consecutive Lactations.
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2022) Stefaniak, Wiktoria P.; Czerniawska-Piątkowska, Ewa; Kowalewska-Łuczak, Inga; Kostiuk, Volodymir; Melnyk, Oleg; Mylostyvyi, Roman; Wrzecińska, Marcjanna; Kossakowski, Kamil; Student Scientific Association of Breeders of Ruminant Animals “TAURUS” at the Department of Ruminant Science, West Pomeranian University of Technology in Szczecin, Poland; Student Students Scientific Association of Animal Geneticists, Department of Genetics and General Animal Breeding, West Pomeranian University of Technology in Szczecin, Poland; Department of Ruminant Science, West Pomeranian University of Technology in Szczecin, Poland; Department of Genetics and Animal Breeding, West Pomeranian University of Technology Szczecin, Poland; National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine; National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine; Department of Technology Processing of Livestock Products, Dnipro State Agrarian and Economic University, Dnipro, Ukraine; Department of Ruminant Science, West Pomeranian University of Technology in Szczecin, Poland; Wrocław University of Environmental and Life Sciences, Department of Environment Hygiene and Animal Welfare, Wrocław, Poland
    The aim of the research was to determine the productivity and reproduction indices of the Polish Holstein-Friesian Black-and-White variety cows in three consecutive lactations. The research was carried out in the Experimental Station of the National Research Institute Kołbacz on the Dębina farm. The herd of 1025 cows were kept in free-stall barns and fed with TMR system. The yield (kg) of milk, FCM milk, protein and fat was analyzed; content (%) of protein and fat and selected reproductive parameters such as age at the first calving, as well as inter-pregnancy periods and calving interval, pe riod service, postpartum downtime in three consecutive 305-day lactations. The studies indicated that the average yield of milk, fat and protein showed an increasing tendency in the next three lactations. The average protein and fat content were similar. The highest results of these ingredients were ob tained in cows in the second lactation. Lactation efficiency influenced the value of the analyzed fertility indices. With the increase in cows’ productivity, the calving interval and inter-pregnancy period, includ ing period service and postpartum downtime, were significantly longer. The longest calving interval and inter-pregnancy period were observed in the third lactation, and the shortest in the first lactation of cows. With the extended of the calving period, the yield of milk, protein, and fat increased. The age at the first calving was the lowest in the 2nd and the highest in the 3rd lactation. The cows calving first for the first time had the highest milk fat content and the shortest calving period. The service period was the longest in the 2nd lactation and occurred in cows with the highest fat content. Postpartum downtime in the studied herd of cows was the longest in the third lactation. The resting period was extended with the increase in the yield of: milk, FCM milk, protein and fat.