Scrotal infrared digital thermography as a predictor of seasonal effects on sperm traits in Braford bulls

Menegassi, Sílvio Renato Oliveira; Barcellos, Júlio Otávio Jardim; Dias, Eduardo; Koetz, Celso; Pereira, Gabriel Ribas; Peripolli, Vanessa; McManus, Concepta; Canozzi, Maria Eugênia Andrighetto; Lopes, Flávio Guiselli

doi:10.1007/s00484-014-0847-z

Cited by 67 publications

(46 citation statements)

References 26 publications

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“…The scrotal surface temperature can be measured by infrared thermography, which is a fast, accurate and noninvasive method, used in andrological evaluations and to understand the scrotal/testicular thermoregulation of bulls (Kastelic, ; Menegassi et al., ). The scrotal surface temperature is reduced from the vascular cone, originating the testicular temperature gradient, which indicates the difference between the temperature of the proximal and distal poles of the testis (Coulter, Senger, & Bailey, ; Kastelic, Coulter, & Cook, ).…”

Section: Introductionmentioning

confidence: 99%

Testicular thermoregulation, scrotal surface temperature patterns and semen quality of water buffalo bulls reared in a tropical climate

et al. 2017

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This study evaluated the capacity of thermoregulation and its consequences on the scrotal surface temperature patterns and semen quality of buffalo bulls raised in a wet tropical climate. Eleven water buffaloes were evaluated in the rainiest, in the transitional and in the less rainy season. Air temperature and humidity were consistently high, but the animals did not show thermal stress in any season. The scrotal temperature gradient of buffalo bulls using infrared thermography was described, and three parallel and decreasing thermal bands were characterised. Sperm quality (n = 176 ejaculates) was maintained in normal parameters over the periods. Pearson's coefficients showed that sperm volume and progressive motility were negatively correlated with ocular globe, epididymal tail and minimum scrotal temperatures (p < .01). Sperm membrane integrity was negatively influenced by increases in epididymal tail and minimum scrotal temperatures (p < .01). Ocular globe temperature also showed positive correlation with rectal, spermatic cord, and epididymal tail temperatures (p < .01). Therefore, even under high temperature and humidity, the thermoregulatory system was effective in preventing heat stress and the normality of scrotal surface temperatures, spermatogenesis and sperm maturation were maintained.

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Section: Introductionmentioning

confidence: 99%

Testicular thermoregulation, scrotal surface temperature patterns and semen quality of water buffalo bulls reared in a tropical climate

et al. 2017

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“…In summary, electrical stimuli were applied in a continuous rhythm and collection of semen samples began when the preejaculatory fluids trickling from the glans penis become opaque and was concluded when the fluids again turned clear (Althouse, 2007;Menegassi et al, 2015).…”

Section: Bulls and Semen Collectionmentioning

confidence: 99%

Reproductive characteristics of Crioulo Lageano breed bulls (Bos taurus) at puberty

Souto¹,

McManus²,

Zago³

et al. 2017

Anim Reprod

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The aim of this research was to evaluate pubertal development characteristics of Crioulo Lageano breed bulls (n = 10) using morphometric measurements and semen analysis, to identify factors that can be used to estimate age at puberty in this locally adapted breed. Monthly measurement of body weight and fortnightly measurement of scrotal circumference, chest girth, testicular length, width, thickness, and volume were recorded for each of the 10 Crioulo Lageano breed bulls, which were between 10 and 20 months old. During this period, semen samples were collected every two weeks using electroejaculation method and analyzed physically and morphologically. The ages of the appearance of first spermatozoa in the ejaculate (FSE), the first motile spermatozoa in the ejaculate (FSEM), seminal puberty (PUB) and total detachment between glans penis and prepuce (DPP) were ascertained. Crioulo Lageano bulls reached puberty at 14.1 ± 2.0 months old with lower weight and larger testicles than those of other bovine breeds. Similarly, the period from FSEM to PUB was shorter and the period from FSE to FSEM was longer than those reported for other breeds. The most important characteristics studied in order to estimate puberty age in Crioulo Lageano bulls were the measures of testicular length, width, and volume. These parameters can be used as criteria to select young bulls as sires.

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“…No entanto, poucos estudos têm avaliado a qualidade do sêmen durante a época de monta em situações de alto estresse térmico devido as dificuldades na realização dos experimentos em ambiente natural (RAVAGNOLO et al,2000;MENEGASSI et al, 2014).…”

Section: Termografia Por Infravermelho Da Bolsa Escrotal Espermogramunclassified

Termografia Por Infravermelho Da Bolsa Escrotal, Espermograma E Morfometria Testicular De Touros Nelore Antes E Durante Da Estação De Monta

Sebastião¹,

Souza²,

Chacur³

2017

COLLOQ AGRARIAE

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RESUMOObjetivou-se estudar na pré-estação de monta e estação de monta a termorregulação testicular com termografia digital por infravermelho, a qualidade do sêmen e a morfometria testicular de touros jovens Nelore, criados extensivamente. Foram utilizados 20 touros Nelore, sendo realizadas, duas coletas de dados antes e duas durante a estação de monta, os procedimentos: coleta e análise de sêmen, mensuração da morfometria testicular e exames de termografia de infravermelho do escroto. Os dados foram submetidos à análise de variância, e comparadas pelo teste de Tukey a 5%. Não houve diferença (P>0,05) entre as estações para as características do sêmen. Houve diferença (P<0,05) entre estações para peso corporal e perímetro escrotal, ambos superiores no verão. As temperaturas do escroto não diferiram (P>0,05) entre estações. Conclui-se que os animais produziram sêmen de qualidade satisfatória com termorregulação testicular mostrando faixas decrescentes de temperatura do cordão espermático em relação ao testículo e caudas do epidídimo. Palavras-chave: espermatogênese; estações do ano; termograma escrotal; touro zebu. INFRARED THERMOGRAPHY OF SCROTUM, SPERMOGRAM AND TESTIS MORPHOMETRY IN NELLORE BULLS BEFORE AND DURING BREEDING SEASON ABSTRACTThe aim of this study was to study the testicular thermoregulation with infrared digital thermography, the semen quality and the testicular morphometry of young Nelore bulls, which were extensively raised. Twenty Nelore bulls were used, two collections of data were collected before and two during the breeding season, the procedures were: collection and analysis of semen, measurement of testicular morphometry and infrared scrotal thermography. The data were submitted to analysis of variance, and compared by the Tukey test at 5%. There was no difference (P> 0.05) between the seasons for semen characteristics. There was a difference (P <0.05) between seasons for body weight and scrotal perimeter, both higher in summer. Scrotal temperatures did not differ (P> 0.05) between seasons. It was concluded that the animals produced semen of satisfactory quality with testicular thermoregulation showing decreasing ranges of temperature of the spermatic cord in relation to the testis and tails of the epididymis. Keywords: spermatogenesis; seasons of the year; scrotal thermograph; bull zebu. INTRODUÇÃORevisando a literatura sobre reprodução de bovinos nos trópicos, Galina e Arthur (1991) abordaram a influência das estações do ano nas características quantitativas e qualitativas do sêmen, relatando que a baixa qualidade do sêmen em alguns animais pode ocorrer devido ao desconforto destes perante temperaturas elevadas.

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Scrotal infrared digital thermography as a predictor of seasonal effects on sperm traits in Braford bulls

Cited by 67 publications

References 26 publications

Testicular thermoregulation, scrotal surface temperature patterns and semen quality of water buffalo bulls reared in a tropical climate

Testicular thermoregulation, scrotal surface temperature patterns and semen quality of water buffalo bulls reared in a tropical climate

Reproductive characteristics of Crioulo Lageano breed bulls (Bos taurus) at puberty

Termografia Por Infravermelho Da Bolsa Escrotal, Espermograma E Morfometria Testicular De Touros Nelore Antes E Durante Da Estação De Monta

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