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Poult Sci 2009. 88:1227-1234. doi:10.3382/ps.2008-00491
© 2009 Poultry Science Association
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Potato (Solanum tuberosum L. cv. Gogu valley) protein as an antimicrobial agent in the diets of broilers1

S. H. Ohh*, P. L. Shinde*, Z. Jin*, J. Y. Choi*, T.-W. Hahn[pic],H. T. Lim[pic],[pic], G. Y. Kim#, Y. Park||, K.-S. Hahm|| and B. J. Chae*,2
* Department of Animal Resources Science, Kangwon National University, Chuncheon-200-701, Republic of Korea; [pic]School of Veterinary Medicine, Kangwon National University, Chuncheon-200-701, Republic of Korea; [pic]School of Biotechnology, Kangwon National University, Chuncheon-200-701, Republic of Korea; [pic]PotatoValley Co. Ltd., Hongcheon-Gun-200-220, Republic of Korea; # Department of Animal Product and Food Science, Kangwon National University, Chuncheon-200-701, Republic of Korea; and || Research Centre of Proteineous Materials, Chosun University, Kwangju-501-759, Republic of Korea
2 Corresponding author: bjchae@kangwon.ac.kr [pic]
Two experiments were conducted to evaluate potato protein (PP,experiment 1) and refined PP (RPP, experiment 2) obtained from Gogu valley tubers as an antimicrobial agent in broiler diets. In both the experiments, 1-d-old male Ross 308 chicks were allotted to 5 treatments and performance, nutrient retention, and microbial populations in excreta and cecum were studied. Dietary treatments were as follows: basal diet (negative control, NC), basal diet with antibiotic(positive control, PC, 10 mg/kg of avilamycin), and low, medium, or high levels of PP (0.25, 0.50, and 0.75%, respectively, in experiment 1) or RPP (200, 400, and 600 mg/kg, respectively, in experiment 2). The overall gain and retention of DM (d 20 to 21) and CP (d 20 to 21 and d 41 to 42) were greater in birds fed PC and high PP diets than birds fed the NC diet. Population of total aerobicbacteria and coliforms was lowest in the cecum and excreta of birds fed the PC diet and highest in birds fed the NC diet. An increase in dietary PP linearly improved BW gain, feed intake, and feed conversion ratio during starter phase and overall BW gain. Also, there was linear improvement in retention of DM (d 20 to 21) and CP (d 20 to 21 and d 41 to 42) and reduced populations of total aerobic bacteriaand coliforms in the cecum (d 42) and excreta (d 28 and 42) due to an increase in dietary PP. In the second experiment, the PC diet and diets with increasing levels of RPP had no effect on performance and nutrient retention. Birds fed the PC diet had the lowest microbial population in excreta and cecum, whereas the population of total aerobic bacteria and coliforms in excreta and cecum decreased(linear, P < 0.05) as the level of RPP was increased in the diet. These results suggest that both PP and RPP obtained from Gogu valley potato tubers have in vivo antimicrobial activity.

Poult Sci 2010. 89:34-43. doi:10.3382/ps.2009-00105
© 2010 Poultry Science Association
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Effect of dietary protein concentrates on the incidence of subclinical necrotic enteritis and growth performance of broiler chickens

M. W. C. D. Palliyeguru, S. P. Rose1 and A. M. Mackenzie
National Institute of Poultry Husbandry, Harper Adams University College, Newport, Shropshire, TF10 8NB, United Kingdom
1 Corresponding author: sprose@harper-adams.ac.uk [pic]
Anexperiment was conducted to quantify the effects of 3 nutritionally complete (similar protein and energy) corn-based diets that contained different dietary protein concentrates (potato-CP 76%, fish-CP 66%, or a mixture of soy proteins, soybean meal-CP 48%, and full-fat soy-CP 36%) on the incidence of spontaneously occurring subclinical necrotic enteritis (NE) in broiler chickens. A total of 1,260 birds...
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