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Objective. To evaluate if female Blackbelly ewes are affected by heat stress (HS) during the summer under tropical conditions. Materials and methods. In the experiment, female sheep were divided into two treatments (7 female lambs and 14 multiparous ewes) to evaluate the effect of HS through the temperature and humidity index (THI), physiological and hematological variables. Results. During the study, a THI between 77 and 88 U was found. Likewise, respiratory frequency (RF) was higher in the T2 in the afternoon (117 bpm) than in the morning (114 bpm) (p<0.05). Also, it was found that rectal temperature (RT) was higher in T1 in the afternoon (39.3°C) than in the morning (38.9°C) (p<0.05). Finally, it was found that the heart rate (HR) was higher in t2 during the afternoon (p<0.05). Hematocrit (HCT) and hemoglobin (HB) variables were similar between groups during the study, but there were differences between samples two through seven (higher concentrations) compared to sample 13 (lower concentration) (p<0.001). Finally, the hydrogen potential (pH) variable presented variations, with samplings three and six being the highest, and samplings four, five, seven, and twelve being the lowest values (p<0.001). Conclusions. Female Blackbelly ewes presented severe HS during the summer in the tropics. [ABSTRACT FROM AUTHOR]

During the summer of 2014 it was carried out a case study in order to evaluate some physiological and behavioral prepartum and postpartum production in dairy cows of high genetic merit responses with access to artificial shades were used. 24 cows in prepartum they stayed in a dry pen. The shadows were located in the rest area and food court. Body weight and body condition were evaluated at start and 30 days into the trial. The respiratory rate was held twice a week in three times a day. The behavior log once a week. Body weight and body condition gain during this period indicating adequate diet was combined with the provision of shade. The average respiratory rate was 60 rpm, indicating a high middle stress. The conduct of standing in the shadow was the most prevalent. Eating behavior are kept within normal values: 92 minutes. Milk production was between 30 and 35 l / d, normal setting. The temperature and humidity index remained above 72. In addition, during february the rains were above normal in the area, caused problems in floor pens. [ABSTRACT FROM AUTHOR]