Effect of Dietary Protein Level and Season on Fecal Microbes and Odorous Compounds in Growing-Finishing Pigs (In Press)

Research in Agriculture and Agronomy

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Tae-Il Kim1,*, Sun-Ho Choi1, Eung-Gi Kwon1 , and Antonio J. Barroga2,*

National I n s t it u t e o f A n i ma l S c i e n c e , Rura l D e ve lop men t Administration, Chungcheongnam-do 331-801, Republic of Korea

1 Department of Animal Resources Development, National I n s t it u t e o f A n i m a l S ci e n c e , R ural De velo pme nt Administration, #114, Shinbang 1 Gil, Seonghawn-eup, Seobuk-gu, Cheonan-si, Chungcheongnam-do 331-801, Republic of Korea

2Department of Animal Science, College of Agriculture, Central Luzon State University, Science City of Munoz, Nueva Ecija, CHED-Center of Excellence for Agricultural Education, 3120, Philippines

 

Volume , Article ID 386158, Research in Agriculture and Agronomy, 35 pages, DOI:

Received date : 6 July 2014; Accepted date : 29 August 2014; Published date : 13 October 2014

Academic editor: Jiufeng Wang

Abstract

This study was done to investigate the effects of varying dietary protein levels (DPLs) and season on fecal microbes and odorous compounds in growing and finishing pigs. Thirty-six Landrace pigs were blocked based on their body weight and within each block assigned to one of the three dietary treatments (3 replicates (pens) per treatment). The DPLs used in the growing stage were 142.7, 155.4 and 174.9 gkg-1 while in the finishing stage were 97.3, 106.3 and 116.9 gkg-1, respectively following a 3 x 3 factorial arrangement. In the growing stage, DPL and season did not alter the population of fecal aerobic bacteria, Salmonella spp, E. coli, other Gram-negative bacteria, total enterobactericiae and fungi. However, fecal coliform count increased significantly from 2.67 x 103 to 6.3 x 106 Colony Forming Unit (CFU)/g (p<0.75) during mid spring to early summer. In the finishing stage, fecal population of aerobic bacteria was reduced (p<0.09) from 1.5 x 109 to 2.93 x 108 CFU/g relative to decreasing dietary CP during midsummer. Pathogenic fecal E. coli was also effectively reduced from 3.1 x 107 to 6.2 x 105 CFU/g (p<3.43) but during mid summer only. Fecal lactic acid colony counts were not different during mid summer and late summer but was significantly increased from 2.6 x 10 8 to 7.7 x 108 CFU/g (p

Keywords: Odorous compound, fecal microbes, iso-valeraldehyde, butanol, xylene RUNNING HEAD: fecal microbes and odorous compound in pigs