J. Anim Sci.
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J. Anim Sci. 1979. 49:1501-1505.
© 1979 American Society of Animal Science
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Reproductive Characteristics of Boars during and after Exposure to Increased Ambient Temperature1,2,

R. P. Wettemann3, M. E. Wells3 and R. K. Johnson4

Oklahoma Agricultural Experiment Station, Stillwater 74074 and USDA, SEA, El Reno 73036

Abstract

Reproductive performance of 12 11-month-old 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<.005) 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.

Footnotes

1 Journal Article No. 3550 of the Agr. Exp. Sta., Oklahoma State Univ., Stillwater. This research was conducted in cooperation with USDA, SEA Southern Region.

2 The authors express their appreciation to R. Vend for assistance throughout this study.

3 Animal Science Dept., Oklahoma State Univ., Stillwater 74074.

4 Present address: Dept. of Animal Science, The Univ. of Nebraska, Lincoln 68503.






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Copyright © 1979 by the American Society of Animal Science.