Investigation of some factors of behavior and milk production of cows bred tied with milk duct

Abstract

The ethological research took part on the farm of the Institute of Animal Breeding in Stara Zagora, Bulgaria with three groups consisting of five cows each, leveled by the method of the analogues in regard to the breed, age lactation, and milk yield. The purpose of this investigation was to determine the influence - changing of the permanent places of cows, change of the sequence of milking and changing of the neighbors bilateral under the main behavior reactions (standing, lying, feeding, moving) and milk production of lactating cows bred tied with milking performed by milk duct. During this research we made visual observations of main reactions of behavior (standing and lying) by the method of group chronometer measuring after 5 min, a day before and 2 days after the change. A control was done under an average daily milk yield and continuing of the milking of each cow from the three groups. We found that the complex change in the investigated factors registered impermanent changes in the built stereotype of animals shown with the changing of main behavior reactions and increase of average daily milk yield.