STUDY OF ADAPTIVE DINAMICS OF SOME PHYSIOLOGICAL REACTION OF BLACK-AND-WHITE COWS EXPOSED TO OUTDOOR AND COVERED BRICK BARN IN DURING SUMMER | ПРОУЧВАНЕ ЗА АДАПТИВНАТА ДИНАМИКА НА НЯКОИ ФИЗИОЛОГИЧНИ РЕАКЦИИ ПРИ ЧЕРНОШАРЕНИ КРАВИ, ЕКСПОЗИРАНИ НА ОТКРИТО И В ЗАКРИТА СГРАДА ПРЕЗ ЛЕТНИЯ СЕЗОН
Krastev, K., Institute of Animal Science, Kostinbrod (Bulgaria)
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.
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Эту запись предоставил Institute of Agricultural Economics