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| Format: | Artículo científico |
| Langue: | en |
| Publié: |
Universidade Estadual de Maringá
2013
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=303128706014 |
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- Thermal conditioning during the first week on performance, heart morphology and carcass yield of broilers submitted to heat stress Jovanir Inês Müller Fernandes Lidiane Boareto Scapini Elisangela Thaísa Gottardo Alvaro Mario Burin Junior Felipe Eduardo dos Santos Marques Leonardo Gruchouskei Agrociencias Chick meat quality thermal conditioning thermoregulatory system This study aimed to assess the influence of thermal conditioning during the first week, and to verify the effect of this, upon the heat challenge by the end of the productive period on performance, heart morphology and carcass yield. A total of 980 Ross male broiler chicks randomly assigned according to a completely randomized design with 4 treatment and 8 replications totaling 32 experimental units. The treatments consisted of different temperature ranges in the first week of life: thermal comfort temperature, temperature below the comfort zone, temperature above the comfort zone and thermal oscillation. At 35 days of age four replicates of each treatment were submitted or not to heat stress in last week's rearing (27 and 32°C). Animals submitted to thermal conditioning in the first week of life showed no adaptation to heat capable of increasing production and carcass characteristics when submitted to chronic heat stress during the final rearing period. Metabolic disorders such as ascites syndrome and sudden death syndrome can occur in both broilers reared above the temperature of thermal comfort in the first week, as those submitted to heat stress from 35 days of age, considering the heart morphometric analysis performed on these birds. 2013 artículo científico 1806-2636 https://www.redalyc.org/articulo.oa?id=303128706014 en http://www.redalyc.org/revista.oa?id=3031 Acta Scientiarum. Animal Sciences application/pdf Universidade Estadual de Maringá Acta Scientiarum. Animal Sciences (Brasil) Num.3 Vol.35