Contribution of the scrotum and testes to scrotal and testicular thermoregulation in bulls and rams

Journal of Reproduction and Fertility
J P KastelicG H Coulter

Abstract

A novel model was used to determine the role of the scrotum and testes in scrotal/testicular thermoregulation in bulls and rams. Eleven yearling bulls and 12 yearling rams were used at an ambient temperature of 15 degrees C. The distal lateral aspects and entire ventral part of the scrotum were incised under caudal epidural analgesia (xylazine, 0.07 mg ml-1). Both testes were withdrawn from the scrotum, the vaginal tunic was removed and one testis was replaced in the scrotum. Surface and internal temperatures were measured with infrared thermography and needle thermocouples, respectively. Temperature gradients (difference in temperature from top to bottom; degree C) for bulls and rams, respectively, were: scrotal surface (with replaced testis) 2.1 and 3.5; scrotal surface (without testis) 2.5 and 3.6; scrotal subcutaneous (with replaced testis) 1.0 and 0.7; testicular subtunic (without scrotum) -0.7 and -0.3; deep intratesticular (with scrotum) -0.2 and -0.6; and deep intratesticular (without scrotum) -0.5 and -0.5. Results supported the hypotheses that the scrotum has a positive temperature gradient (warmer at the top than the bottom) and that the testis has a negative temperature gradient (warmer at the bottom than the top). ...Continue Reading

Citations

Nov 28, 2013·Theriogenology·John P Kastelic
May 23, 2014·International Journal of Biometeorology·Silvio Renato Oliveira MenegassiFlávio Guiselli Lopes
Mar 11, 2017·International Journal of Biometeorology·Andrea L WallageJ B Gaughan
Aug 10, 2017·International Journal of Biometeorology·Maneesh Kumar AhirwarSayyad Nazar
Jun 9, 2018·Animal : an International Journal of Animal Bioscience·J P KastelicJ Thundathil
Jan 18, 2008·Reproduction in Domestic Animals = Zuchthygiene·M A R SiddiquiM Shamsuddin
Jun 9, 2019·Animals : an Open Access Journal From MDPI·Angela M LeesJohn B Gaughan
Aug 13, 2011·Reproductive Medicine and Biology·Masashi Takahashi
Jul 19, 2020·European Journal of Obstetrics, Gynecology, and Reproductive Biology·Ronald H F Hunter, Fernando López-Gatius
Jan 5, 2000·The Veterinary Record·H O CisaleH A Fernández
Jan 25, 2020·Theriogenology·Gabriel Ribas PereiraIvan Cunha Bustamante-Filho
Feb 18, 2019·Theriogenology·Eduarda EscobarFrancielli Weber Santos Cibin
Oct 8, 2018·Theriogenology·Ana Beatriz Bossois MouraAlexandre Rossetto Garcia
Jul 18, 2020·Theriogenology·Concepta M McManusSamuel R Paiva

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