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1283 cows of black-white lowland breed kept on state farms in the areas of various pollution degree were studied. Three groups of herds were distinguished according to the degree of pollution: the cows following the first lactation, the cows that began their milk production in 1973-80 and culled in 1974-84. The following data were determined for each cow: the age of the first calving, the lenght of...
Milk yield of all the cows from selected herds, kept in various areas polluted by a copper smelter was analysed. The herds studied were divided into 3 groups according to the degree oat pollution of the area. Milk yield of 625 cows was examined. The cows started production in 1978-82 and followed the first three lactations. Milk yield was corrected for the season and age of calving. The data enabled...
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