| Effects of feeding diets containing bacitracin methylene disalicylate (BMD) to heat-stressed finishing pigs. | |
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MedLine Citation:
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PMID: 21297060 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objective of this study was to evaluate the effects of heat stress and dietary bacitracin methylene disalicylate (BMD) on growth performance, carcass characteristics, and immunological responses in finishing pigs. Four groups of 32 finishing pigs (n = 128) with initial BW between 80 to 90 kg were used. Pigs were fed a corn-soybean meal-distiller's grains based control (CON) or BMD (31.5 ppm) diet for a 14-d adaptation period at the thermal neutral temperature (23°C), and continued to be fed their respective diets when exposed to a constant temperature (23°C) or a cyclical heat stress environment (37°C from 1000 to 1900 h and 27°C from 1900 h to 1000 h) for a 28-d experimental period. Each group of pigs was housed in 4 rooms with 2 pens/room and 4 pigs/pen. Saliva samples from each pig were collected on d -1 (initial baseline), d 1, 13, and 27 for cortisol analysis. Levels of haptogolobin (Hp), IL-1β, and tumor necrosis factor were determined in serum samples on d -1, 1, 13, and 27. Pigs exposed to heat stress had 31% lower ADG (P < 0.001), 23% lower ADFI (P < 0.001), 9% lower G:F (P < 0.001), and 34% higher average daily water intake (P = 0.03), compared with those in the non-heat stress conditions. Dietary BMD tended to reduce ADG (P < 0.07) compared to CON (0.66 vs. 0.73 kg/d, respectively). Heat stress increased (P < 0.05) saliva cortisol on d 1, but no effects were observed on subsequent days. Serum Hp levels were higher (P < 0.05) in heat-stressed pigs on d 1, and levels tended to remain high (P < 0.1) on d 13. Pigs fed the BMD diet tended to have longer villus height (P = 0.07) in duodenum, and greater crypt depth in duodenum (P = 0.09) and jejunum (P = 0.07). Heat-stressed pigs tended to have a lower proportion of propionate (P = 0.08), greater acetate:propionate (P = 0.08), and a lower proportion of valerate (P = 0.02) in the cecum. These results indicate that BMD did not counteract the negative effects of heat stress on growth performance, but appears to increase villi height and crypt depth in the duodenum. Furthermore, heat stress appears to alter VFA production in finishing pigs. |
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Authors:
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R Song; D N Foster; G C Shurson |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-4 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal Science, University of Minnesota, St. Paul, MN 55108. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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