J. Anim Sci.
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J. Anim Sci. 1980. 50:21-28.
© 1980 American Society of Animal Science
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Influence of the Porcine Stress Syndrome on Production and Carcass Traits1

J. P. Carlson, L. L. Christian, D. L. Kuhlers2 and B. A. Rasmusen3

Iowa State University,4, Ames 50011

Abstract

Thirty-two pigs from seven litters with equal numbers of porcine stress syndrome (PSS) positive and negative pigs within a litter were utilized to assess the effects of PSS on production and carcass traits. Differences between PSS groups for average daily gain and feed efficiency were not significant. Blood creatine phosphokinase (CPK) measured both at 8 to 10 weeks of age and at slaughter was higher (P<.01) for PSS positive pigs, while length of halothane exposure and muscle rigidity scored during halothane exposure were lower. Longissimus muscle pH measured 45 min postmortem was lower (P<.01) for PSS positive pigs, while Photovolt reflectance color and light transmittancy of the longissimus muscle were greater than for PSS negative animals. Live backfat probe, carcass backfat and tenth rib fat were not significantly different between PSS groups, although PSS positive pigs were leaner in carcass composition, particularly in the ham and shoulder. Longissimus muscle area was significantly larger for PSS positive pigs and this group also tended to score higher on two indices used to rank breeding stock.

Footnotes

1 Journal Paper No. J-9411 of the Iowa Agr. and Home Economics Exp. Sta., Ames. Project No. 2176. The authors gratefully acknowledge the assistance of D. G. Olson, Univ. of Nebraska, in collecting bone strength data.

2 Present address: Dept. of Animal and Dairy Sciences, Auburn University, Auburn, AL.

3 Univ. of Illinois, Champaign-Urbana.

4 Dept. of Animal Science.






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Copyright © 1980 by the American Society of Animal Science.