uses of infrared thermography to evaluate the effects of climatic variables in bull’s reproduction

The objective of this study was to evaluate the seasonal effects of the environment on sperm quality in subtropical region determined by temperature and humidity index (THI). We used 20 Brangus bulls (5/8 Angus × 3/8 Nellore) aged approximately 24 months at the beginning of the study. Semen evaluati...

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Bibliographic Details
Published in:International journal of biometeorology 2016-01, Vol.60 (1), p.151-157
Main Authors: Menegassi, Silvio Renato Oliveira, Pereira, Gabriel Ribas, Dias, Eduardo Antunes, Koetz, Celso, Jr, Lopes, Flávio Guiselli, Bremm, Carolina, Pimentel, Concepta, Lopes, Rubia Branco, da Rocha, Marcela Kuczynski, Carvalho, Helena Robattini, Barcellos, Júlio Otavio Jardim
Format: Article
Language:English
Subjects:
analysis of variance
Angus
Animal Physiology
Animal reproduction
Animals
autumn
bioclimatology
Biological and Medical Physics
Biometeorology
Biophysics
Body Temperature
Brangus
bulls
Cattle
Cattle - physiology
Climate change
climatic factors
correlation
Earth and Environmental Science
Environment
Environmental changes
Environmental effects
Environmental Health
epididymis
Humidity
Infrared Rays
Male
Meteorology
Nellore
Original Paper
Plant Physiology
Reproduction
seasonal variation
Seasons
Selective breeding
Sperm Motility
Spermatogenesis
spermatozoa
spermiogenesis
spring
subtropics
summer
Temperature
Temperature gradients
testes
Testis - physiology
Thermography
Variance analysis
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Summary:The objective of this study was to evaluate the seasonal effects of the environment on sperm quality in subtropical region determined by temperature and humidity index (THI). We used 20 Brangus bulls (5/8 Angus × 3/8 Nellore) aged approximately 24 months at the beginning of the study. Semen evaluations were performed twice per season during 1 year. Climate THI data were collected from an automatic weather station from the National Institute of Meteorology. Infrared thermography images were used to determine the temperature of the proximal and distal poles of the testis to assess the testicular temperature gradient (TG). The seasonal effects on seminal and climatic variables were analyzed with ANOVA using MIXED procedure of SAS. Sperm motility in spring (60.1 %), summer (57.6 %), and autumn (64.5 %) showed difference compared to winter (73.0 %; P 
ISSN:0020-7128
1432-1254
DOI:10.1007/s00484-015-1013-y