The aim of this research was to study the effect of addition of natural extract of chestnut (Castanea sativa) Silvafeed ENC® in commercial feed on the growth of broilers. Two hundred and four broiler chicks (Cobb 508) 14 d old male, were randomly assigned to 12 floor pens and fed commercial diet supplemented with 0% (CE0), 0.15% (CE15), 0.20% (CE20) and 0.25% (CE25) of ENC. The ENC addition showed a beneficial effect on weight increases daily feed intake (DFI) and average daily gain (ADG) from 14 to 35 days of age. In the second half of trial the effects were less evident and concluding with a detrimental effect in CE25 group. Feed conversion rate (FCR) appears to be statistically different in the second and fifth weeks of feeding. The inclusion of ENC at 0.20%, (CE20) had significant influences on final weight, DFI and ADG and a favourable influence on FCR in comparison with the other three groups. In conclusion, ENC has been shown to be beneficial at concentrations between 0.15% and 0.20%

Achille Schiavone

Gasco, L.

Guo, K.

Malfatto, V.

Tassone, S.

Zoccarato, I.

Italian Journal of Animal Science

English

The aim of this research was to study the effect of addition of natural extract of chestnut (Castanea sativa) Silvafeed ENC&reg; in commercial feed on the growth of broilers. Two hundred and four broiler chicks (Cobb 508) 14 d old male, were randomly assigned to 12 floor pens and fed commercial diet supplemented with 0% (CE0), 0.15% (CE15), 0.20% (CE20) and 0.25% (CE25) of ENC. The ENC addition showed a beneficial effect on weight increases daily feed intake (DFI) and average daily gain (ADG) from 14 to 35 days of age. In the second half of trial the effects were less evident and concluding with a detrimental effect in CE25 group. Feed conversion rate (FCR) appears to be statistically different in the second and fifth weeks of feeding. The inclusion of ENC at 0.20%, (CE20) had significant influences on final weight, DFI and ADG and a favourable influence on FCR in comparison with the other three groups. In conclusion, ENC has been shown to be beneficial at concentrations between 0.15% and 0.20%

I. Zoccarato

V. Malfatto

L. Gasco

S. Tassone

K. Guo

A. Schiavone

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Use of natural extract of chestnut (Silvafeed ENC®) in broiler feeding: effect on growth performance

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Full Terms & Conditions of access and use can be found athttps://www.tandfonline.com/action/journalInformation?journalCode=tjas20Italian Journal of Animal ScienceISSN: (Print) 1828-051X (Online) Journal homepage: https://www.tandfonline.com/loi/tjas20Use of natural extract of chestnut (SilvafeedENC®) in broiler feeding: effect on growthperformanceA. Schiavone, K. Guo, S. Tassone, L. Gasco, V. Malfatto & I. ZoccaratoTo cite this article: A. Schiavone, K. Guo, S. Tassone, L. Gasco, V. Malfatto & I. Zoccarato(2007) Use of natural extract of chestnut (Silvafeed ENC®) in broiler feeding: effect on growthperformance, Italian Journal of Animal Science, 6:sup1, 731-733, DOI: 10.4081/ijas.2007.1s.731To link to this article:  https://doi.org/10.4081/ijas.2007.1s.731Copyright 2007 Taylor & Francis Group LLCPublished online: 15 Mar 2016.Submit your article to this journal Article views: 119Citing articles: 1 View citing articles ITAL.J.ANIM.SCI. VOL. 6 (SUPPL. 1), 731-733, 2007 731Use of natural extract of chestnut(Silvafeed ENC®) in broiler feeding:effect on growth performanceA. Schiavone1, K. Guo2, S. Tassone2, L. Gasco2,V. Malfatto2, I. Zoccarato21 Dipartimento di Produzioni Animali, Epidemiologia e Ecologia. Università di Torino, Italy.2 Dipartimento di Scienze Zootecniche. Università di Torino, ItalyCorresponding author: Kaijun Guo, Dipartimento di Scienze Zootecniche, Università di Torino, Via L.da Vinci 44, 10095 Grugliasco (TO), Italy - Tel. +39 011 6708568 - Fax: +39 011 6708563 - Email:guo.kaijun@unito.itABSTRACT - The aim of this research was to study the effect of addition of natural extract of chestnut(Castanea sativa) Silvafeed ENC® in commercial feed on the growth of broilers. Two hundred and four broilerchicks (Cobb 508) 14 d old male, were randomly assigned to 12 floor pens and fed commercial diet supplement-ed with 0% (CE0), 0.15% (CE15), 0.20% (CE20) and 0.25% (CE25) of ENC. The ENC addition showed a benefi-cial effect on weight increases daily feed intake (DFI) and average daily gain (ADG) from 14 to 35 days of age.In the second half of trial the effects were less evident and concluding with a detrimental effect in CE25 group.Feed conversion rate (FCR) appears to be statistically different in the second and fifth weeks of feeding. Theinclusion of ENC at 0.20%, (CE20) had significant influences on final weight, DFI and ADG and a favourableinfluence on FCR in comparison with the other three groups. In conclusion, ENC has been shown to be benefi-cial at concentrations between 0.15% and 0.20%.Key words: Hydrolysable tannin, Silvafeed ENC, Broilers, Growth performance.INTRODUCTION - In 2006, the EU banned the use of antibiotic growth promoters (AGP) in animal feeding.Many approaches have been proposed in order to replace the AGP and to maximise performance and economic viabili-ty. The hydrolysable tannins appear interesting (Graziani et al. 2006). From a nutritionist’s view point, tannins in ani-mal feeds are a double-edged sword. For a long time, tannins have been considered as antinutritional factors reducingdigestibility of crude protein and consequently growth performances in monogastric animals (Mueller-Harvey, 2006)while in ruminant nutrition, the results appear more positive (Mueller-Harvey, 2006; Tabacco et al., 2006). Moreover,tannins have shown anthelmintic properties in ruminants (Min and Hart, 2003) and in birds (Marzoni et al., 2005). Inour previous findings (Schiavone et al., 2006) we observed that Silvafeed ENC in broiler feed did not influence the invivo digestibility. The aim of this trial was to study the growth performance of broilers fed with different doses of ENC.MATERIAL AND METHODS - Two hundred and four 1 day-old male Cobb 508 broiler chicks  were housed ina standard broiler house and fed ad libitum. In the first two weeks, the heating was provided to keep the room tem-perature in accordance with standard brooding practices. The trial lasted for 42 days from 14 to 56 d of age. On the14th day, the chicks were weighed and randomly divided into 12 groups of 17 chicks each. Each group was assigned toa floor pen (1.7 m2) furnished with rice hulls and wood chip (50:50 w/w) as litter. A commercial diet (ME: 12.34 MJ/kg;crude protein: 20%) was supplemented with 0% (CE0), 0.15% (CE15), 0.20% (CE20) and 0.25% (CE25) of ENC. Thediets were assigned to 12 pens according to latin square design. Each chick was identified by wing mark and everyweek, individual body weight and feed consumption per pen were recorded. Mortality was recorded daily. At the endof the cycle, individual average daily gain (ADG), daily feed intake (DFI), and feed conversion rate (FCR), on a flockbasis, were calculated. Data were statistically analysed with ANOVA of SPSS (SPSS Inc., Chicago, IL, USA).PROC. 17th NAT. CONGR. ASPA, ALGHERO, ITALY732 ITAL.J.ANIM.SCI. VOL. 6 (SUPPL. 1), 731-733, 2007RESULTS AND CONCLUSIONS - The weights, DFI, ADG and FCR measured at different ages are shownin figure 1. The addition of ENC showed a positive effect on weight increases in the first three weeks; growthwas directly proportional to the concentration of ENC. From the 42nd to 49th day of age the favorable trendshowed by ENC was maintained, but the differences were not significant.On the 56th day CE20 group showed a significant higher weight than CE25 (Fig.1). In the first three weeks,irrespectively to ENC concentration, DFI was higher in the treatment groups than in the control; whereas fromday 42 to day 56 the DFI showed a slowing down more evident in the group CE25 than the control, CE15 andCE20 groups; from day 49 to 56 the DFI in CE25 was significantly lower than the other groups.Similarly, ENC had favorable influences on ADG in the first two weeks, especially for CE20 and CE25,while the effect in CE25 was drastically reversed in the last two weeks.The effects on FCR were significant only from day 21 to day 28 and from day 42 to 49; during the secondweek group CE20 showed a more favorable FCR while, due to the reduction of ADG, in the fifth week CE25showed an unfavorable rate.As a whole trial, CE20 had significantly positive effects on final weight, DFI and ADG (table 1). Favorable effectswere evident also on FCR even though the differences among the four groups were not significant; CE15 and CE20,showed significant differences on DFI in comparison with CE0 and CE25. The highest final weight and more favorableFCR showed in CE20 group could be explained by the positive trend of digestibility observed in our previous study(Schiavone et al., 2006) and by the fact that ENC could modify the stability of the gastrointestinal microflora improv-ing the competitive exclusion similarly to others plant extracts (de Lange, 2005). In fact, as observed by Li and Song(2004) and Graziani et al., (2006), chestnut natural extract, has antimicrobial effects on different bacterial strains asE.coli, B.subtilis or S.enteriditis and C. Perfirigens type A. In this trial, the observed FCR were better than the resultsof Diao and Qi (1999) which ranged from 2.20-2.24 within 0-8 weeks old of broilers and higher than those reviewed byFigure 1. Trends of broiler’s weights, daily feed intakes, average daily gains and FCR.A, B, C=P<0.01; a, b, c= P<0.05.PROC. 17th NAT. CONGR. ASPA, ALGHERO, ITALYITAL.J.ANIM.SCI. VOL. 6 (SUPPL. 1), 731-733, 2007 733de Lange (2005). In conclusion, the broilers in this study showed an acceptable growth performance and the supple-mentation of ENC up to 0.20% appeared to be safety and allowed a beneficial effect on productive traits. Nevertheless,more research is necessary to understand the action of ENC at gastrointestinal tract level.A special thanks to Mrs Daniela Laurino and Mrs Emily Joseph for birds care and technical support.The research was supported by SilvaTeam S.r.l. - San Michele di Mondovì (Cuneo) Italy.REFERENCES - de Lange, L., 2005. Nutribiotics could replace antibiotics in feed. World Poult.21(10): 26-28. Diao, Q., Qi, G., 1999. Tannins in livestock feed in China. Proceedings of International Workshop on tan-nins in livestock and human nutrition. Adelaide, Australia, 31 May-2 June, 1999. p 66-70. Graziani, R., Tosi,G., Denti R. 2006. In vitro antimicrobial activity of Silvafeed ENC® on bacterial strains of poultry origin. World’sPoultry Science Journal. 62 (suppl.):12th European Poultry Conference. Verona. Italy. Paper 10859. Li, Y., SongG., 2004. Study on bacteriostasis of chestnut shell extract. Chemistry and Industry of Forest Products, 24(4):61-64 (in chinese). Marzoni, M., Castillo, A. Romboli, I., 2005. Dietary inclusion of Quebracho (Schopsis lorentzii)tannins on productive performances of growing pheasant females. Ita. J. Anim. Sci. 4(2): 507-509. Min, B.R.,Hart, S.P., 2003. Tannins for suppression of internal parasites. J. Anim. Sci. 81 (E. Suppl. 2): E102-E109.Mueller-Hervey, I., 2006. Unravelling the conundrum of tannins in animal nutrition and health. J. Sci. FoodAgric., 86: 2010-2037. Schiavone, A., Tassone, S., Guo, K., Perona, G., Gasco, L., Zoccarato, I., 2006. Dietaryadministration of chestnut extract in chicken broilers. World’s Poultry Science Journal. 62 (suppl.):12thEuropean Poultry Conference. Verona. Italy. Paper 10856. Tabacco, E., Borreani, G., Crovetto, G.M., Galassi,G., Colombo, D., Cavallarin, L., 2006. Effect of chesnut tannin on fermentation quality, proteolysis and proteinrumen degradability of alfalfa silage. J. Dairy Sci., 89: 4736-4746.Table 1. Growth performances of broilers from 14 to 56 d of age.Group CE0 CE15 CE20 CE25 SENumber 51 51 51 51Initial weight 263.70 266.60 274.61 272.65 2.54Final weight 2967.11ab 3024.65ab 3144.70b 2881.46a 25.78DFI* 128.91A 134.92B 132.28B 128.96A 0.44ADG* 64.22ab 65.58ab 68.28b 62.40a 0.58FRC* 2.02 2.09 1.96 2.10 0.02Means with different letters in the same row differ significantly.A, B=P<0.01; a, b= P<0.05.*DFI: daily feed intake; ADG: average daily gain; FRC: feed conversion ratio.

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Use of natural extract of chestnut (Silvafeed ENC®) in broiler feeding: effect on growth performance

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