STUDY OF ADAPTIVE DINAMICS OF SOME PHYSIOLOGICAL REACTION OF BLACK-AND-WHITE COWS EXPOSED TO OUTDOOR AND COVERED BRICK BARN IN DURING SUMMER

Krasimir Krastev

Abstract: This study was done with the in to establish the dynamics of physiological indicators: pulse, breathing and rectal temperature of milk cows with is result of such ecological factors in production environment. The experiment was carried out in July 2011. A number of 6 milk cows of Bulgarian Black and white cows breed were included, being equal in live weight, lactation number (2 - 3), lactation period of about 135 days and milk yield of 12 l on average at the beginning of the experiment. The following environmental parameters were recorded: air temperature (°C), wind velocity (m/s), relative humidity (%), level of cooling (mcal/cm2/s) and light intensity (lx). Rectal temperature, puls, breathing of animals were measured 5 times a day, at an interval of three hours. The milk cows pulse outdoor and covered brick barn a similar model of variation, a slight rise being recorded at the evening hours of the day. Intensity of solar radiation exerted a substantial influence on breathing. The rectal temperature outdoors showed a rise at the daytime hours, as compared to the registered morning values for both conditions, but it was considerably greater in the milk cows under outdoor conditions.

Keywords: breathing; ecological factors; milk cows; puls; rectal temperature

Date published: 2023-01-31