Document Detail

Effects of feed particle size and feed form on survival of Salmonella typhimurium in the alimentary tract and cecal S. typhimurium reduction in growing broilers.
MedLine Citation:
PMID:  16673759     Owner:  NLM     Status:  MEDLINE    
An in vitro experiment and an in vivo experiment were conducted to investigate the effects of feed particle size (coarse and fine) and feed form (mash and pellet) on the survival of Salmonella typhimurium (ST) in the alimentary tract, and the reduction of cecal ST in growing broilers in a 2 x 2 factorial design. All diets in the 2 trials were corn and soybean meal-based diets that differed only in physical characteristics. Diets were provided for birds from d 1 to 22 of age. In the in vitro trial, the relative gizzard weight was lower in birds that were fed the pellet diet (P < 0.01), whereas the relative weight of the cecum was higher in these birds (P < 0.01). Broilers receiving the pellet diet had enhanced concentrations of volatile fatty acids in contents from both the gizzards and the ceca. In addition, there was an increase in gizzard pH (P < 0.01) with the pellet diet, but a reduction in cecal pH (P < 0.05). Pellet-fed birds showed a significantly decreased and increased in vitro death rate of ST in the contents from gizzards (P < 0.01) and ceca (P < 0.05), respectively. A higher in vitro ST death rate in the gizzard was observed in birds given the coarse mash diet compared with those given the fine mash diet. In the in vivo experiment, cecal volatile fatty acid concentrations were increased, whereas cecal pH was decreased significantly (P < 0.05) when birds were fed the pellet diet compared with the mash diet. Furthermore, cecal ST concentrations were higher (P < 0.05) in broilers fed the pellet diet than in those fed the mash diet. Results indicated that the pellet diet increases the incidence of ST in gizzards and ceca in growing broilers and provide evidence demonstrating that the gizzard may play a critical role in reducing ST contamination in growing broilers.
D S Huang; D F Li; J J Xing; Y X Ma; Z J Li; S Q Lv
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  85     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-05     Completed Date:  2006-06-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  831-6     Citation Subset:  IM    
National Key Lab of Animal Nutrition, China Agricultural University, Beijing.
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MeSH Terms
Animal Feed*
Cecum / microbiology
Chickens / growth & development*,  microbiology*
Fatty Acids, Volatile / analysis
Gastrointestinal Tract / microbiology*
Gizzard / anatomy & histology,  microbiology
Hydrogen-Ion Concentration
Organ Size
Particle Size
Poultry Diseases / microbiology*
Random Allocation
Salmonella typhimurium / growth & development*
Reg. No./Substance:
0/Fatty Acids, Volatile

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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