utilização de aditivos em rações formuladas com milho normal e de baixa qualidade para frangos de corte additive in diets formulated with standard and low quality corn for broiler chickens
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2008
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Abstract
Foi conduzido um experimento com 2.112 pintos de corte, machos da linhagem Ross, para avaliar a influência da utilização de aditivos não-nutrientes (antibiótico, prebiótico e simbiótico) sobre o desempenho e as características de carcaça de frangos de corte. As aves foram distribuídas em delineamento inteiramente casualizado, em arranjo fatorial 2 × 6 (milho × aditivo), totalizando 12 tratamentos, com oito repetições e 22 aves por unidade experimental. As rações foram formuladas à base de milho e farelo de soja, utilizando-se, na metade dos tratamentos, milho de qualidade normal (T1, T2, T3, T4, T5 e T6) e na outra metade, milho de baixa qualidade (T7, T8, T9, T10, T11 e T12). Os tratamentos foram: T1 e T7 = ração basal (RB); T2 e T8 = RB + antibiótico; T3 e T9 = RB + simbiótico; T4 e T10 = RB + prebiótico 1 (0,5kg/t); T5 e T11 = RB + prebiótico 1 (1,0 kg/t); e T6 e T12 = RB + prebiótico 2 (1,0 kg/t). Para aumentar o desafio sanitário, além da cama reutilizada, os bebedouros não foram lavados periodicamente, com o objetivo de piorar a qualidade da água de bebida. Aos 21 e 42 dias de idade, foram avaliados ganho de peso, consumo de ração e conversão alimentar. Aos 23 dias de idade, foram avaliadas as características físicas do fígado e a presença de petéquias no peito e na coxa e aos 42 dias, as características de carcaça e o peso relativo do fígado. Verificou-se efeito do aditivo somente para ganho de peso aos 21 dias e para ganho de peso e consumo de ração aos 42 dias. Não foi observado efeito dos aditivos sobre as demais características avaliadas. Os prebióticos à base de mananoligossacarídeos e o simbiótico podem substituir o antibiótico avilamicina nas rações para aves, pois não promoveram perdas no desempenho das aves. O uso de milho de baixa qualidade piorou o desempenho, provocando perdas no rendimento e na qualidade de carcaça de frangos de corte.
An experiment was conducted with 2,112 Ross male broiler chicks, with the objective to evaluate the use of non-nutrient additives (antibiotic, prebiotic and symbiotic) on performance and carcass characteristics of broilers. The birds were distributed in a complete randomized design in 2 × 6 (corn × additive) factorial arrangement, with 12 rations, eight replicates and 22 birds per experimental unit. Diets were based on corn and soybean meal, using in the half the rations standard quality corn (Rations 1 to 6) and the other half low quality corn (Rations 7 to 12). The rations were: 1 and 7, basal diet (BD); 2 and 8, BD + antibiotic; 3 and 9, BD + Symbiotic; 4 and 10, BD + prebiotic 1 (0.5 kg/t); 5 and 11, BD + prebiotic 1 (1.0 kg/t) and 6 and 12 BD + prebiotic 2 (1.0 kg/t). To increase the animal health challenge, beyond the reused bed, drinkers were not periodically cleaned, with the objective to decrease water quality. Average weight gain, feed intake and feed conversion ratio were evaluated at 21 and 42 days of age. At 23 days of age, the physical characteristic of liver and the presence of petechias in the breast and drumstick were determined, and at 42 days of age, the carcass characteristics and relative liver weight were also evaluated. Additive effect on average weight gain at 21days age, and on average weight gain and feed intake at 42 days age was observed. There was no additive effect on the others evaluated characteristics. The prebiotic based on mannanoligosaccharides and symbiotic can replace antibiotic avilamicin in broiler diets, therefore they had not promoted losses in the performance of the birds. The uses of low quality corn worse the animal performance, with decresaing yield and carcass quality of broiler chickens.
An experiment was conducted with 2,112 Ross male broiler chicks, with the objective to evaluate the use of non-nutrient additives (antibiotic, prebiotic and symbiotic) on performance and carcass characteristics of broilers. The birds were distributed in a complete randomized design in 2 × 6 (corn × additive) factorial arrangement, with 12 rations, eight replicates and 22 birds per experimental unit. Diets were based on corn and soybean meal, using in the half the rations standard quality corn (Rations 1 to 6) and the other half low quality corn (Rations 7 to 12). The rations were: 1 and 7, basal diet (BD); 2 and 8, BD + antibiotic; 3 and 9, BD + Symbiotic; 4 and 10, BD + prebiotic 1 (0.5 kg/t); 5 and 11, BD + prebiotic 1 (1.0 kg/t) and 6 and 12 BD + prebiotic 2 (1.0 kg/t). To increase the animal health challenge, beyond the reused bed, drinkers were not periodically cleaned, with the objective to decrease water quality. Average weight gain, feed intake and feed conversion ratio were evaluated at 21 and 42 days of age. At 23 days of age, the physical characteristic of liver and the presence of petechias in the breast and drumstick were determined, and at 42 days of age, the carcass characteristics and relative liver weight were also evaluated. Additive effect on average weight gain at 21days age, and on average weight gain and feed intake at 42 days age was observed. There was no additive effect on the others evaluated characteristics. The prebiotic based on mannanoligosaccharides and symbiotic can replace antibiotic avilamicin in broiler diets, therefore they had not promoted losses in the performance of the birds. The uses of low quality corn worse the animal performance, with decresaing yield and carcass quality of broiler chickens.
| Reference Key |
godoi2008revistautilizao
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|---|---|
| Authors | ;Mauro Jarbas de Souza Godoi;Luiz Fernando Teixeira Albino;Horacio Santiago Rostagno;Paulo Cezar Gomes;Sergio Luiz de Toledo Barreto;José Geraldo de Vargas Junior |
| Journal | european journal of lipid science and technology |
| Year | 2008 |
| DOI |
10.1590/S1516-35982008000600008
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| URL | |
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