EFFECT OF THE DRY AND RAINY ENVIRONMENT ON THE BEHAVIOR AND PRODUCTION OF DAIRY COWS

Abstract

Brazilian milk production is based on crossbred animals, mostly fed on pasture, insolation and other climate challenges. The objective was to evaluate the influence of climatic variations on the production and behavior of animals from genetic groups in DIC in a 2x2 factorial, evaluating the effects of the bioclimatic conditions of the dry period and the ethological responses. It is observed that the rainy season in the region had a significant effect (p<0.05) for production in the summer compared to the spring, in which the primiparous gyr, multiparous gyr and multiparous gyrolando holidays respectively of 20.19; 16.15 and 27.7 liters day -1, while primiparous girolandos did not follow this trend. It was found that the order room with metallized cover is less efficient to reduce thermal stress such as vacancies than the conditions of the rest area, whose insolation protection is based on trees, as recorded by the wet bulb thermometer σ² of 0.45, in relation to the greater temperature variation by the dry bulb under the shed, σ² 4.23. Therefore, the dry period in the mid-northern region is characterized by the occurrence of high temperatures, where the cows turn turning than the turning ones.