High systemic and testicular thermolytic efficiency during heat tolerance test reflects better semen quality in rams of tropical breeds

International Journal of Biometeorology
Priscila Reis KahwageAlexandre Rossetto Garcia

Abstract

This study aimed to assess the capacity of Morada Nova (MN) and Santa Inês (SIN) rams to maintain body and testicular homeothermy under thermal challenge. For 5 days in the summer, 16 males (SIN = 7 and MN = 9) underwent a heat tolerance test, i.e., period 1-animals maintained in the shade (11 to 12 h); period 2-animals exposed to sunlight (12 to 13 h); and period 3-animals returned to the shade (13 to 14 h). The respiratory rate, heart rate, rectal temperature, and infrared surface temperatures (IRT) of the trunk, back, eyeball, and testicles were assessed in each period. The index of capacity of tolerance to insolation (ICTI), which indicates the animals' level of adaptability, was calculated for each animal. Semen quality and testicular parenchyma integrity were assessed before and after the thermal challenge. Statistical analyses were performed at 5% significance. In period 1, the variables had baseline values for both genotypes. In period 2, the variables involved in thermolysis significantly increased (P < 0.05), which matches a thermal discomfort situation. In period 3, the variables returned to baseline values and some values were lower than those in period 1. Semen quality and testicular parenchyma integrity suffered n...Continue Reading

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Citations

May 8, 2018·International Journal of Biometeorology·Narian RomanelloAlexandre Rossetto Garcia
Jun 15, 2019·Tropical Animal Health and Production·Andréa do Nascimento BarretoAlexandre Rossetto Garcia
Feb 26, 2021·Journal of Thermal Biology·Arnaldo Algaranhar GonçalvesOtávio Mitio Ohashi
Oct 8, 2018·Theriogenology·Ana Beatriz Bossois MouraAlexandre Rossetto Garcia

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