Growth performance, carcass characteristics, physiological and gut health effects of feeding diets containing bacitracin methylene disalicylate (BMD) to heat-stressed finishing pigs.
2009-12
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Growth performance, carcass characteristics, physiological and gut health effects of feeding diets containing bacitracin methylene disalicylate (BMD) to heat-stressed finishing pigs.
Authors
Published Date
2009-12
Publisher
Type
Thesis or Dissertation
Abstract
Heat stress affects pig growth performance, carcass composition, and immune
status. The present study was conducted to evaluate the effects of heat stress and
adding bacitracin methylene disalicylate (BMD, 30g/ton) to a 10% DDGS
commercial diet on growth performance, carcass characteristics, physiological
parameters, small intestine morphology, and hindgut volatile fatty acid (VFA)
production of finishing pigs. Four groups of 32 finishing pigs (n = 128) with
initial BW between 80 to 90 kg were used in this study. Pigs were randomly
assigned to diets and environmental temperature treatments in a 2 x 2 factorial
arrangement. Pigs were fed a control (CON) or BMD (30g/ton) diet and exposed
to a constant thermal neutral temperature (23°C) or cyclical heat stress conditions
(37°C from 10:00 to 19:00 and 27°C from 19:00 to 10:00) in environmental
chambers for a 28-d experimental period. Pigs housed under heat stress
conditions had significantly lower average daily gain (ADG, P < 0.0001), average
daily feed intake (ADFI, P < 0.0001), gain:feed (G:F, P < 0.001), and higher
average daily water intake (ADWI, P = 0.03), compared with pigs housed in the
thermoneutral environment. Supplementation of BMD in the diet did not
improve growth performance of pigs. Average daily gain tended (P = 0.07) to be lower for pigs fed the BMD diet, while ADFI, G:F, and ADWI were not affected
by dietary treatment. Carcass characteristics did not differ between dietary
treatments. However, pigs assigned to the heat stress environment had lower live
BW (P < 0.0001) and lower hot carcass weight (P < 0.0001) than pigs housed in the thermal neutral environment. Dressing %, 10th rib back fat depth, loin eye
area, and lean % were not affected by temperature treatment. Saliva cortisol
concentration did not differ between dietary treatments during the experimental
period, but the initial level was lower (P < 0.05) for pigs fed the BMD diet. Heat
stress led to an increased (P < 0.05) level of saliva cortisol on d 1, but no effects
were observed on the following days. Serum haptoglobin concentration was not
different between dietary treatments, while heat stressed pigs showed a higher (P
< 0.05) level of haptoglobin on d 1, and levels tended to remain higher (P < 0.1)
on d 13 of heat stress. Cytokines IL-1β and TNF-α were not affected by heat
stress, but pigs fed the BMD diet had an initial lower (P < 0.0001) level of serum
IL-1β, and tended to be lower (P < 0.1) on d 13 of heat stress as compared to pigs
fed CON. Small intestine morphology was not affected by temperature treatment,
but pigs fed the BMD diet tended to have greater (P = 0.07) villi height at
duodenum, and greater crypt depth at duodenum (P = 0.09) and jejunum (P =
0.07), respectively. Dietary treatment did not affect VFA production in the
cecum, while pigs housed under heat stress conditions tended to have less propionate (P = 0.08) concentration, greater A:P ratio (P = 0.08), and significantly
less valerate (P = 0.02) produced in the cecum compared with pigs under the
thermoneutral environment.
Description
University of Minnesota M.S. thesis. December 2009. Major: Animal Science. Advisor: Gerald C. Shurson. 1 computer file (PDF); ix, 117 pages.
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Song, Ran. (2009). Growth performance, carcass characteristics, physiological and gut health effects of feeding diets containing bacitracin methylene disalicylate (BMD) to heat-stressed finishing pigs.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/60022.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.