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The objective of this study was to determine the effects of dominance hierarchy in a dairy cattle herd on milk yield. Observations of social behaviors in a group of 126 Polish Holstein-Friesian cows were carried out for seven days, starting from the first grazing day. In order to estimate the position of each animal in the herd, the interactions and relationships between cows were studied. The indices...
The paper presents the basic outside and inside pelvic diameters of 136 Holstein-Friesian cows, and the coefficients of phenotypic correlation between these measurements and the course of parturition.
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