Respostas produtivas, comportamentais e fisiológicas de vacas criadas sob sistema biodinâmico em diferentes ambientes de pré ordenha e níveis de produção leiteira.

Abstract

The objective this work were to assess on grazing in two different environments of pre milking about the behavior in milk from cows of Brown Swiss on the productive responses, physiological, hormonal and quality from the biodynamic production system. That study was put in four chapters. Into the first chapter, we looked for information about the importance in to use the natural and artificial shading in grasslands and about the shadow efficiency and about the cooling systems on the milking in the milkmaid to confirm about the importance strategy for the comfort and the milk production. On the chapter II, we did the review in the papers about the production characterize and the milk qualify from the cattle form the ecological and traditional system to observe about the low in the production and the composition in the ecological milk was because the short technology in the handling in the used system. Into the chapter III we look for to evaluate the influence about the ambience on grazing about the food behavior rumination and resting, day and night (test I) of 32 cows, we had 16 in low and 16 in up production and look for about action of ambiences in pre milking on the sun and in with out sun. The cows from low production eating for up time in hot hours in the day when we make to comparison with the up production cows but the animal with the both level grazing more in the day (test I). In the ambiences in pre milking (Test II), the cows with the high production were more sensitive about the hot weather than the animal in the cooling weather and the ambience of pre milking with out sun were more efficiency with the physiological variations in the acceptance level for the cattle apart the two production levels. Into the chapter IV, we evaluated the effect of sun and shade environments on production, milk quality and hormonal plasma concentration of 32 cows, divided into high and low levels of milk production. In fact, it was found, that shade for 1.5 hours before the pre milking afternoon the cows in Brown Swiss from biodynamic production system, while reducing the influence weather in the cows, does not improve its yield and the composition milk.