Factors affecting physiological constants in Simmental and Simbrah cattle in western Mexico
DOI:
https://doi.org/10.29059/cvpa.v2i2.26Keywords:
thermoregulation, beef cattle, respiratory rateAbstract
Heat stress is a disadvantage for livestock production in tropical climates. Temperature is not the only parameter that modifies physiological constants. In Mexico, Simmental and Simbrah breeds contribute to national beef production in different agroecological zones, therefore it is important to evaluate the environmental factors that modify the main physiological constants in Simmental and Simbrah animals in western Mexico. A total of 341 specimens distributed in 6 production units were used. There were 147 specimens of Simmental breed and 194 of Simbrah breed, males and females with an average age of 18 months. Respiratory Rate (RR), Heart Rate (HR), Rectal Temperature (RT) and ITH levels were measured in the months of June and July of 2018 and 2019. Danger levels of ITH were present in both measurements (morning and afternoon). Statistical analysis of physiological values was performed by repeated measures analysis of variance using PROC MIXED of SAS, version 9.4. Mean comparison was performed with Fisher's protected t test for multiple comparisons. Comparison of means was performed with Fisher's protected t multiple comparisons test. The effects of year and month presented differences in the constants having higher measurement of FC in the year 2018 and higher measurement in the TR and FR in the month of July. The effect of age and ITH presented significant statistical differences (p < 0.05) for RT, HR and RR. The physiological constants of cattle are affected by the degree of difference in ITH observed at different times (morning and afternoon) associated with the implementation of thermoregulatory mechanisms.
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Accepted 2025-01-28
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