J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 2008. 86:1789-1798. doi:10.2527/jas.2007-0801
© 2008 American Society of Animal Science
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
jas.2007-0801v1
86/8/1789    most recent
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by White, H. M.
Right arrow Articles by Latour, M. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by White, H. M.
Right arrow Articles by Latour, M. A.

ANIMAL GROWTH, PHYSIOLOGY, AND REPRODUCTION

Effects of temperature stress on growth performance and bacon quality in grow-finish pigs housed at two densities

H. M. White, B. T. Richert, A. P. Schinckel, J. R. Burgess, S. S. Donkin and M. A. Latour1

Department of Animal Sciences, Purdue University, West Lafayette, IN 47907

1 Corresponding author: mlatour{at}purdue.edu

Managing stressors is essential for optimizing pig growth performance. To determine the effects of temperature and space allocation on growth performance and carcass characteristics, pigs were housed within their thermoneutral zone, at 23.9°C, or above their thermoneutral zone, at 32.2°C, and were provided either 0.66 or 0.93 m2/pig for the final 35 d of the grow-finish period. Individual BW were recorded on d 1, 10, 20, and 30. At slaughter, carcass measurements and samples of backfat and belly fat were collected. Final BW was decreased (P ≤ 0.05) from 113 to 103 kg for pigs housed at 32.2°C. The ADG was reduced (P < 0.05) for pigs housed at 32.2°C (0.89 vs. 0.54 kg/d), as was G:F (0.28 vs. 0.24). Housing at 0.66 m2/pig resulted in pigs that were lighter (P ≤ 0.05), at 106 compared with 110 kg, as a result of decreased (P ≤ 0.05) ADG (0.78 to 0.65 kg/d) and decreased (P ≤ 0.05) G:F (0.275 to 0.255) compared with pigs housed at 0.93 m2/pig. Pigs housed at a greater spatial allocation had elevated (P ≤ 0.05) ADFI. The interaction of housing at 32.2°C and decreasing spatial allocation increased (P ≤ 0.05) the adipose iodine value from 66.8 to 70.4, decreased (P ≤ 0.05) the saturated:unsaturated fatty acids ratio from 0.59 to 0.56, and increased (P ≤ 0.05) the n-6:n-3 from 23.56 to 25.27. Decreased spatial allocation resulted in decreased (P ≤ 0.05) belly weights. Although increased temperature did not affect belly weight, the 32.2°C pigs had decreased (P ≤ 0.05) raw and cooked slice weights, increased (P ≤ 0.05) percentage lean of bacon, increased (P ≤ 0.05) lean:fat ratio of bacon slices, increased (P ≤ 0.05) raw slice scores, and increased (P ≤ 0.05) quantity of collagen in belly fat. Some of these changes may have resulted from changes in lipid metabolism. Increasing spatial allocation in the 32.2°C pigs decreased fatty acid synthase (P = 0.03) and stearoyl-CoA desaturase- 1 (P = 0.08) mRNA expression in adipose tissue. The results from this study demonstrated decreased growth, carcass lipid quality, and bacon quality in pigs housed at temperatures above the thermoneutral zone; however, increasing the spacial allocation for housing may be a means to ameliorate the negative effects of temperature stress.

Key Words: bacon quality • carcass quality • housing density • swine • temperature stress






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by the American Society of Animal Science.