EFFET D’UN TRAITEMENT THERMIQUE PRECOCE D’UNE SEMAINE A TEMPERATURE DECROISSANTE SUR L’EVOLUTION DU POIDS VIF DU POULET DE CHAIR ELEVE EN CLIMAT CHAUD

Bengharbi Zineb, Dahmouni Said, Mouats Aziz, Halbouche Miloud

Abstract


This work was conducted to study the effect of early age conditioningof broilers as a mean against high chronic ambient temperatures and theirbad effects on zootechnical performances and the economic losses theygenerate.400 one day-old broiler Hubbard chicks were randomly assigned tofour treatments (n = 100): (T) control (normally raised), (Aa) and (Ab) earlyage thermal conditioning (exposed to temperature of 39±1°C for 24 h at 3rdday of age and at 5th day of age respectively, and (Ac) chronic stress(exposed to gradually decreasing temperatures from 40°C to 34°C from dayone till day 8 of age). During growth and finishing periods, experimentalanimals were raised in thermal ambiance of 28±1°C.Chicks‘ daily growth evolution during the first 8 days of life was significantin groups T and Ac, but was not significant in Aa and Ab groups which wasprobably due to disturbed growth caused by the heat treatment. However, itsweekly evolution Aa and Ab showed a compensative growth since the 4thweek revealed by body weights of 1625g±26.97 and 1736g±26.71respectively. A highly compensation difference (p˂0.05), was noticed at theend of the 7th week in Ab group subjects (3622.2g±42.15) compared to2681g±85.95, 2680g±5513 and 2424g±66.45 of T, Aa and Ac respectively.In conclusion, early age thermal conditioning of broilers at 39±1°C for 24 hduring the 5th day of age enables to lute against decreased final bodyweights caused by elevated chronic ambient temperatures.

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European Scientific Journal (ESJ)

 

ISSN: 1857 - 7881 (Print)
ISSN: 1857 - 7431 (Online)

 

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