Changes in serum testosterone and anti-Müllerian hormone concentration in bulls undergoing scrotal insulation

Ferrer, Maria S.; Palomares, Roberto A.; Hurley, David J.; Norton, Natalie; Bullington, A.C.; Hoyos‐Jaramillo, Alejandro; Bittar, J. H. J.

doi:10.1016/j.domaniend.2021.106685

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…We have also shown the THI effect on libido like Hürland et al (2023). It can be explained by heat stress effect on hormonal levels, especially “testosterone” in bulls (Ferrer et al, 2022). High levels of this stress impact sperm quality and quantity as described before (Al‐Kanaan et al, 2015; Llamas‐Luceño et al, 2020) Therefore, low levels of THI are suitable for presenting a short time of RT as a libido indicator in bulls.…”

Section: Discussionmentioning

confidence: 99%

Reaction time as a libido indicator and its relation to pre‐freeze and post‐thaw sperm quality in bulls

KORKMAZ

Baştan

Şahin

et al. 2023

Reprod Domestic Animals

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Libido and sperm quality output relationship is already not clear in farm animals. The present study compared reaction time (RT) as a libido indicator and the pre‐freeze and post‐thaw sperm quality of AI bulls. Before the collection of ejaculates (n = 53, from 22 AI bulls [4.2 ± 1 years of age]), RTs were collected using a chronometer as the interval between the bull's arrival at the semen collection area and his first false mount (FM) on another male. The ejaculates were examined for their volume, concentration and motility. Subsequently, all aliquots were diluted with a commercial semen extender and equilibrated for 3 h before freezing. Frozen semen samples were thawed and examined for sperm kinematics using CASA, plasma membrane and acrosome integrity of sperm (PMAI) by flow cytometry. Additionally, the temperature humidity index (THI) values were assessed during the study. Multiple linear regression analysis was used to analyse the data. The results indicated that THI had a significant effect on libido (p < .001). However, libido had no effect on either pre‐ or post‐thaw sperm quality parameters except for the velocity of the average pathway (VAP) (p < .05). Therefore, relying solely on RT –libido‐ as an indicator of bull sperm quality at AI stations may not be reliable, as it is a complex behavioural assessment.

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Section: Discussionmentioning

confidence: 99%

Reaction time as a libido indicator and its relation to pre‐freeze and post‐thaw sperm quality in bulls

KORKMAZ

Baştan

Şahin

et al. 2023

Reprod Domestic Animals

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“…Scrotal insulation for 8 days was associated with Sertoli and Leydig cell dysfunction. 12 Testosterone concentrations increased initially after scrotal insulation and then declined and remained low for at least 96 days; beyond when normospermia returned. This longer duration scrotal insulation study was the first to demonstrate that scrotal insulation was associated with a decline in testosterone concentrations.…”

Section: Pathophysiologymentioning

confidence: 99%

“…Disruption of testes thermoregulation is the most understood cause of testicular degeneration. 12 The most common cause of transitory testicular degeneration is 'summer infertility' associated with seasonally elevated ambient temperatures and humidity. 13 A long duration scrotal insulation study using a 20-day treatment period proved to be very effective in disrupting the testicular thermoregulatory processes sufficiently to cause degeneration in 3 of 5 treated bulls.…”

Section: Pathophysiologymentioning

confidence: 99%

Pathophysiology, diagnosis, and management of testicular degeneration in the bull

Koziol

Palmer²

2023

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Testicular degeneration in the bull is described as diffuse disintegration of seminiferous tubule structure and function causing a profound reduction in sperm concentration, scrotal circumference, and an increase in sperm morphologic abnormalities resulting in subfertility or permanent infertility. Degenerative changes within the seminiferous epithelium occur most commonly after an insult to spermatogenesis or may be idiopathic. Common insults include trauma, stress (environmental, heat, nutritional), or toxins. Idiopathic is most often associated with age-related changes. Clinical signs of testicular degeneration are discussed along with approaches to treatment and potential prognoses as related to treatment and management practices that can be employed by the general practitioner and specialist alike. This review will also encompass a discussion on the pathophysiology of this disease so that the practitioner has a detailed understanding of the disease, which improves their ability to employ evidence-based medicine and sound clinical reasoning.

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Effect of access to natural shade on scrotal thermoregulatory capacity, integrity of the testicular parenchyma and sperm morphology of Nelore (Bos indicus) and Canchim (Bos taurus x Bos indicus) bulls

Romanello,

Barreto,

de Carvalho Balieiro

et al. 2024

Int J Biometeorol

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Changes in serum testosterone and anti-Müllerian hormone concentration in bulls undergoing scrotal insulation

Cited by 5 publications

References 27 publications

Reaction time as a libido indicator and its relation to pre‐freeze and post‐thaw sperm quality in bulls

Reaction time as a libido indicator and its relation to pre‐freeze and post‐thaw sperm quality in bulls

Pathophysiology, diagnosis, and management of testicular degeneration in the bull

Effect of access to natural shade on scrotal thermoregulatory capacity, integrity of the testicular parenchyma and sperm morphology of Nelore (Bos indicus) and Canchim (Bos taurus x Bos indicus) bulls

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