A development was lead to study the relations between productive, physiological variable and of animal
comfort of buffalos and factors of the physical environment, in silvipastoril system, involving african
mahogany (Khaya ivorensis) and indian nim (Azadirachta indica) and intensive rotation grazing of
Cynodon nlemfuensis, in the period of may of 2003 the november of 2004, in the Unit of Animal
Research "Senator Alvaro Adolpho", Embrapa Eastern Amazon, Belem, Para state, in the climatic type
Afi, with the rainier of december to may and less rainy time, of june to november. The area of
experimental pasture, 5,4 ha, is divided in six plots, with animal permanence of five days and 25 days of
rest. Had been used 26 buffaloes Murrah race, no castrated, with age between 231 and 303 days.
Descriptive analysis of the experimental data was effected, for attainment of averages, shunting line
standard, minimum and maximum values, correlations and variances, considering weight gain,
availability and chemical composition of the pasture, physiological variable of the animals, climatic
variable, development of the forest essences, Comfortal Index (CI) and Temperature – humidity Index
(THI). Excellent performance of the experimental animals was observed, with 0.911 average gain of
kg/day and 510 kg of final alive weight. In the periods more and less rainy, the availability, the crude
protein levels of stem, leaf and entire plant and the digestibility "in vitro" of the dry and the organic
matter of the pasture had been satisfactory, taking care of the minimum necessities for maintenance
and detached productive performance. Occurred interferences of the meteorological variable in the
cardiac beatings, respiratory frequency, rectal temperature and ruminal movement of the animals. The
CI exceeded the critical level, mainly in the period less rainy, as well as the THI levels had been raised,
supplanting considered of emergency, indicating the necessity of practical of manipulation of the
physical environment to raise the animal performance. The development of the forest essences already
supplies better ambience to the animals, in function of the shade, which contributes for the reduction of
thermal stress and promotes better performance productive of the buffalos.
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