PEREIRA, G. M.; http://lattes.cnpq.br/3044107923218200; PEREIRA, Gabriella Marinho.
Resumo:
The aim of this work is to evaluate the physiological behavior of Saanen goats breed
submitted to sharp heat stress, through rectal temperature, respiratory frequency and
heat tolerance test of BENEZRA parameters, in the semi-arid in different times. It was
used 25 goats, 23 female goats and 2 male goats not castrated, with ages between 1,5
and 5 years-old and middle weight from 23,2 Kg to 52,1Kg. It was used random
completely outlined (RCO) with two treatments (cold and heat time) with 15 and 10
repetitions in respective time. The environmental variables, Humid Bulb Temperature
(HBT), Dried Bulb Temperature (DBT), Black Globe Temperature under Shadow
(BGTS) and Black Globe Temperature under Sun (BGTS) in cold and heat times and
Humid and Black Globe Temperature Rate (HBGTR) under shadow and sun in different
times, it was registered from 10:00 am to 15:00 pm. The physiological parameters:
Rectal Temperature (RT) and Respiratory Frequency (RF) were checked for three days
consecutive. There were a significant effect of turn and time (P<0,05) for all
environmental variables, exceptional of (HBGTR) under shadow in the morning during
the time. In relation to the parameters RT and RF there were a significant effect
(P<0,05) of time only after stress. The average of RT and RF after stress in heat time
were higher (P<0,05) than the registered in cold time. Comparing the average of the
parameters, here mentioned before and after stress, check that independent of time these
rates were significantly (P<0,05) higher after stress in relation to the observed before. It
was observed that, in the conditions of this experiment, the Saanen goats breed
presented the ability to maintain the homeothermy, but with significant increase of
respiratory rate.