Bioclimatic thermal stress indices and their relationships with andrological characteristics in hair rams.

This study evaluated relationships among reproductive parameters and the bioclimatic indices: temperature and humidity index (THI), equivalent temperature index (ETI), black globe temperature and humidity index (BGTHI), and thermalv comfort index (TCI), during the frst 45 days of spermatogenesis (SP-45) and during the 15 days of sperm transit through the epididymis (STP-15) that preceded the reproductive assessments (ReA). Such information is useful in determining the optimal breeding season in Northeast Brazil. Santa Inês rams (n=25) underwent two ReA in three periods of the year (D-P=dry; R-P=rainy and RD-P=rainy/dry transition), and the bioclimatic indices were calculated at the corresponding SP-45 and STP-15 timepoints prior to each ReA. Sperm kinetic parameters in D-P were depressed compared to R-P and RD-P (P<0.05). The index values had an antagonistic relationship with most parameters and regression analysis demonstrated that the BGTHI and the TCI had a negative association with the progressive motility, curvilinear, straight line, and average path velocities, and a positive association with slow sperm in the ejaculate in SP-45 and STP-15 phases (P<0.01). Semen quality kinetics is afected throughout the year by the environment and it is apparent that it is impaired in D-P and better in R-P and RD-P seasons. The BGTHI and TCI measured in the sperm production phase classifed the environment most coherently and presented better association with the behavior of sperm kinetics.

Bibliographic Details

Main Authors:	MOLINA, J. C. J., SILVA, R. S. da, BIDEGAIN, F. A., SOUZA, Y. B., PURDY, P. H., BLACKBURN, H. D., AZEVEDO, H. C.
Other Authors:	JULIO CONSTANTINO JERI MOLINA, UNIVERSIDADE FEDERAL DE SERGIPE; REBECA SANTOS DA SILVA, UNIVERSIDADE FEDERAL DE SERGIPE; FABIANA ALMEIDA BIDEGAIN, UNIVERSIDADE FEDERAL DE SERGIPE; YANCA BIZERRA SOUZA; PHILLIP H. PURDY, UNITED STATES DEPARTMENT OF AGRICULTURE; HARVEY D. BLACKBURN, UNITED STATES DEPARTMENT OF AGRICULTURE; HYMERSON COSTA AZEVEDO, CPATC.
Format:	Artigo de periódico biblioteca
Language:	eng
Published:	2024-07-30
Subjects:	Santa Inês, Carneiro, Sêmen, Recurso Genético, Caprino, Ships, Semen banks,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1166078 https://doi.org/10.1007/s00484-023-02587-0
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