Influence of Elevated Ambient Temperature on Reproductive Performance of Boars

Wettemann, R. P.; Wells, M. E.; Omtvedt, I. T.; Pope, C. E.; Turman, E. J.

doi:10.2527/jas1976.423664x

Cited by 116 publications

(77 citation statements)

References 7 publications

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“…The volume of semen produced by control and heat stressed boars was similar (P>.10) before, during and after treatment (figure 1). This concurs with previous studies which indicate that semen volume, which is produced by the accessory reproductive glands, is not altered by acute (McNitt and First, 1970) or chronic (Wettemann et al, 1976) heat stress, although heat stress of boars can provoke a marked alteration in testicular androgen biosynthesis (Wettemann and Desjardins, 1979).…”

Section: Resultssupporting

confidence: 92%

“…Respiratory rates determined at the same time were increased (P<.05) about threefold in heat stressed compared to control boars (92.8 + 9.9 vs 30.8 + 4.1, breaths per min, respectively). These increases in rectal temperatures and respiratory rates during heat stress are similar to those previously reported (Wettemann et aL, 1976). Boars did not lose the ability to ejaculate, as reflected by ejacula collected from all boars throughout the experiment.…”

Section: Resultssupporting

confidence: 88%

“…An exception to the above ejaculation regimen was during days 33 through 38 of treatment, when boars were collected daily to evaluate the effect of frequent ejaculation on sperm output. Semen volume, sperm output, motility and morphology were evaluated weekly as previously described (Wettemann et aL, 1976).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Exposure of boars to increased ambient temperatures results in a reduction in semen quality (McNitt and First, 1970;Wettemann et al, 1976). This decrease in semen quality during heat stress of boars is associated with reduced pregnancy rates and increased embryonic mortality (Christenson et al, 1972;Wettemann et al, 1976). Exposure of boars to increased ambient temperature for 3 days, caused a reduction in semen quality that persisted for 6 to 8 weeks after treatment (McNitt and First, 1970;Christenson et al, 1972).…”

Section: Introductionmentioning

confidence: 99%

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Reproductive Characteristics of Boars during and after Exposure to Increased Ambient Temperature2

Wettemann

Wells

Johnson

1979

Journal of Animal Science

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SummaryReproductive performance of 12 ll-monthold Yorkshire boars was determined during and after exposure to control or increased ambient temperatures. After 3 weeks adjustment at 23 C in temperature controlled chambers, six boars were heat stressed by exposure to 34.5 + 1.0 C for 8 hr and 31.0 • 1.0 C for 16 hr during each 24-hr period and six control boars were maintained at 23.0 + 1.0 C for 11 weeks. All boars were subsequently exposed to 23 C for 6 weeks. Semen was collected twice weekly before, during and after heat stress and boars were naturally mated with gilts during weeks 7 to 11 of treatment. Daily rectal temperatures and respiratory rates were increased during heat stress, but the ability to ejaculate and semen volume were not altered. Percentage motile sperm was decreased during heat stress (P<.O05) and did not return to normal values until 5 weeks after the end of exposure to increased ambient temperatures. Daily sperm output from heat stressed boars was decreased (P<.025) during daily ejaculation on days 33 to 38 of treatment and averaged 54% of the total sperm ejaculated by control boars. At 30 days after natural breeding only 59% (P<.05) of the gilts bred by heat stressed boars were pregnant compared to 82% for gilts mated to control boars.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reproductive Characteristics of Boars during and after Exposure to Increased Ambient Temperature2

Wettemann

Wells

Johnson

1979

Journal of Animal Science

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Diseases of the Reproductive System

Althouse¹,

Kauffold²,

Rossow³

2019

Diseases of Swine

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Scrotal heat stress effects on sperm viability, sperm DNA integrity, and the offspring sex ratio in mice

Pérez-Crespo¹,

Pintado²,

Gutiérrez-Adán³

2007

Molecular Reproduction Devel

255

157

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Evidence exists to suggest detrimental effects of heat stress on male fertility. This study was designed to assess the effects of scrotal heat stress on mature and developing sperm in a mouse model. After receiving shock heat treatment (42 degrees C for 30 min), mature spermatozoa were recovered from the epididymis hours (6) or Days (7, 14, 21, 28, 60) later, to determine the variables: number of spermatozoa, sperm viability, motility and progressive motility, sperm DNA integrity as established by the TUNEL method, embryo implantation rate, and sex ratio of the fetuses conceived using the heat-exposed spermatozoa. Our results indicate that transient mild heat treatment does not affect in the same way the different types of male germ cells. Spermatocytes present within the testis at the time of heat stress resulted into a lower concentration of spermatozoa with reduced viability and low motility. Even though, DNA integrity of spermatozoa resulting from spermatocytes was also compromised by heat stress, the higher degree of DNA damage was found among spermatozoa resulting from spermatids present within the testis at the time of heat stress. At last, heat shock effect on spermatozoa present in the epididymis at the time of thermal stress resulted into a sex ratio distortion. These findings point to a higher sensitivity of spermatocytes to heat exposure and also suggest a different response of X and Y chromosome-bearing spermatozoa to heat stress that warrants further investigation.

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Influence of Elevated Ambient Temperature on Reproductive Performance of Boars

Cited by 116 publications

References 7 publications

Reproductive Characteristics of Boars during and after Exposure to Increased Ambient Temperature2

Reproductive Characteristics of Boars during and after Exposure to Increased Ambient Temperature2

Diseases of the Reproductive System

Scrotal heat stress effects on sperm viability, sperm DNA integrity, and the offspring sex ratio in mice

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