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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2009, Vol. 3 Issue (1) : 84-88     DOI: 10.1007/s11703-009-0016-z
Effects of microbial agents on small intestinal structure and the quantity of cecal microorganisms in broilers
Yaodi NI, Xiuhui ZHONG(), Haifeng WANG, Li XU, Shupeng WEI
College of Traditional Chinese Veterinary Medicine, Agricultural University of Hebei, Dingzhou 073000, China
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In order to elucidate the significance and related mechanisms of microbial agents in modulating the growth of broilers, one-day-old Avian broilers were employed to investigate the effect of microbial agents on body weight, daily gain and feed efficiency at various stages. The birds in the experimental groups were given salmonella pullorum then fed with antibiotics to counteract it. The results showed that the average broiler weight of the oral microbial agent group at the age of 40 days was significantly increased by 16.58% from 1520 g to 1772 g (P<0.05). The feed conversion efficiency was decreased from 2.21 to 1.82 (P<0.01). In the experimental group fed with microbial agents, microscopic observation revealed that the intestinal villi increased in number, length and orderliness. The intestinal wall became thickened. The glands in the intestine were developed, which would be beneficial to nutrient absorption. The effect of oral microbial agents was identical to that due to antibiotics. It was also observed that Lactobacillusdominated the cecal microorganisms in broilers.

Keywords microbial agent      broilers      intestinal structure      cecal microorganisms     
Corresponding Authors: ZHONG Xiuhui,   
Issue Date: 05 March 2009
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groupsbody weight(g) at age 40 dfeed-meat rate at age 40 d
Group 1 1772 ± 68a1.82 ± 0.16a
Group 21550 ± 73bc1.85 ± 0.13bc
Group 31440 ± 45b1.92 ± 0.26b
Group 41520 ± 55c2.21 ± 0.25c
Tab.1  Body weight gain and feed-conversion ratio in different groups
grouplength of the intestine villi/μmintestinal wall thickness/μm
Group 11229.6±271.2A375±38.6a
Group 21032.2±204.5AB318±47.5ab
Group 3564.3±161.6C156±66.3b
Group 4721.5±132.0C282±52.8b
Tab.2  Intestinal wall thickness and length of intestinal villus in each group
microorganismmicrobial agents Anorfloxacin Bcontrol CSEM
anaerobic bacterium×1097.95a5.47ab2.10b32
E. coli×1081.202.11.400.54
Tab.3  Changes of the quantity of lactobacilli, . , anaerobic bacterium in caecum
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