1. El estrés calórico afecta a las hembras ovinas Blackbelly durante el verano en el trópico.
- Author
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García González, Ethel C., Pineda-Buraos, Blanca C., Ruiz-Ortega, Maricela, Cortez-Romero, Cesar, Paredes-Alvarado, Marisol, and Ponce-Covarrubias, José L.
- Subjects
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TROPICAL conditions , *EWES , *LAMBS , *SHEEP , *HEMATOCRIT - Abstract
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]
- Published
- 2024
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