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Heat Stress in Boars: Environmental Impact and Mitigation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Heat Stress in Boars: Environmental Impact and Mitigation./
Author:	Berndtson, Jodi L.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	207 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-04, Section: B.
Contained By:	Dissertations Abstracts International83-04B.
Subject:	Animal sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28767899
ISBN:	9798460424917

Heat Stress in Boars: Environmental Impact and Mitigation.
Berndtson, Jodi L.

Heat Stress in Boars: Environmental Impact and Mitigation. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 207 p.

Source: Dissertations Abstracts International, Volume: 83-04, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2021.

This item must not be sold to any third party vendors.

Seasonal infertility associated with heat stress is a globally recognized phenomenon contributing significant economic loss to the pork industry. Heat stress reduces semen quality and negatively impacts spermatogenesis. The objective of this study was to investigate new and existing heat stress mitigation techniques in boars and to develop a new repeatable, reproducible environmental heat stress model. Cool-cell technology is the most common heat mitigation technique utilized in boar studs to reduce environmental impacts on spermatogenesis. Regardless of this technology, commercial boar studs in North Carolina, Texas and Virginia experienced increases in facility temperature above the upper thermoneutral zone of swine leading to changes in sperm nuclear shape via Fourier harmonic analysis as early as 3 weeks after increased temperature. Changes in overall sperm nuclear shape occurred for longer time periods than specific harmonic amplitude values suggesting overall sperm cell shape is most important to identify chronic heat stress. A novel method to mitigate heat stress, PG600, was demonstrated. PG600 is used to induce puberty in gilts and estrus in weaned sows. Treatment with PG600 decreased the days when changes in sperm quality, post scrotal insulation, were seen as well as the magnitude of the response (p<0.05). While scrotal insulation is the most common method to induce heat stress in livestock species it does not induce whole-body heat stress. A repeatable, reproducible environmental heat stress model which replicates what is seen during summer months is necessary to advance the study of seasonal infertility. Boars were exposed to daytime temperatures of 30°C or 32.2°C and nighttime temperatures of 23.9°C for a week. Neither morphology nor sperm nuclear shape were affected by daytimes temperatures of 30°C (p>0.05). Temperatures of 32.2°C altered sperm nuclear shape (p0.05). Daytime temperatures of 30°C or 32.2°C with cooler nighttime temperatures (23.9°C) were not sufficient to induce heat stress similar to that seen in boar studs. Increases in temperature or humidity and duration of increased temperature could improve this model. Without a proper environmental heat stress model that delivers repeatable results, scrotal insulation remains the most promising method to study heat stress in boars.

ISBN: 9798460424917Subjects--Topical Terms:

3174829
Animal sciences.
Subjects--Index Terms:

Fourier harmonic analysis

Heat Stress in Boars: Environmental Impact and Mitigation.
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520 $a Seasonal infertility associated with heat stress is a globally recognized phenomenon contributing significant economic loss to the pork industry. Heat stress reduces semen quality and negatively impacts spermatogenesis. The objective of this study was to investigate new and existing heat stress mitigation techniques in boars and to develop a new repeatable, reproducible environmental heat stress model. Cool-cell technology is the most common heat mitigation technique utilized in boar studs to reduce environmental impacts on spermatogenesis. Regardless of this technology, commercial boar studs in North Carolina, Texas and Virginia experienced increases in facility temperature above the upper thermoneutral zone of swine leading to changes in sperm nuclear shape via Fourier harmonic analysis as early as 3 weeks after increased temperature. Changes in overall sperm nuclear shape occurred for longer time periods than specific harmonic amplitude values suggesting overall sperm cell shape is most important to identify chronic heat stress. A novel method to mitigate heat stress, PG600, was demonstrated. PG600 is used to induce puberty in gilts and estrus in weaned sows. Treatment with PG600 decreased the days when changes in sperm quality, post scrotal insulation, were seen as well as the magnitude of the response (p<0.05). While scrotal insulation is the most common method to induce heat stress in livestock species it does not induce whole-body heat stress. A repeatable, reproducible environmental heat stress model which replicates what is seen during summer months is necessary to advance the study of seasonal infertility. Boars were exposed to daytime temperatures of 30°C or 32.2°C and nighttime temperatures of 23.9°C for a week. Neither morphology nor sperm nuclear shape were affected by daytimes temperatures of 30°C (p>0.05). Temperatures of 32.2°C altered sperm nuclear shape (p0.05). Daytime temperatures of 30°C or 32.2°C with cooler nighttime temperatures (23.9°C) were not sufficient to induce heat stress similar to that seen in boar studs. Increases in temperature or humidity and duration of increased temperature could improve this model. Without a proper environmental heat stress model that delivers repeatable results, scrotal insulation remains the most promising method to study heat stress in boars.
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