efeito da restrição alimentar qualitativa sobre o ganho compensatório em frangos de corte effects of qualitative feed restriction on compensatory growth in the broiler chicken
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Abstract
No presente estudo, aplicou-se a diluição qualitativa da dieta com o objetivo de determinar os efeitos das diferentes diluições (25% e 50%) das rações no desempenho de frangos de corte criados até 42 dias de idade. Utilizou-se, para a diluição, casca de soja na dieta inicial (21,5% de PB e 3.050 kcal/kg de EM), e os tratamentos experimentais foram baseados nessas dietas e distribuídos de forma contínua, durante sete dias, ou de forma intercalada, com a ração não diluída. Os tratamentos aplicados foram: T1: ração inicial (testemunha); T2 e T3: ração inicial diluída com 25% e 50% de casca de soja, respectivamente, fornecida durante sete dias; T4 e T5: ração inicial diluída com 25% e 50% de casca de soja, respectivamente, fornecida nos dias 7, 9, 11 e 13, intercalada com a ração testemunha nos dias 8,10 e 12. As aves sob restrição alimentar mostraram pesos corporais menores (P<0,05) em comparação com as aves do tratamento-testemunha. Não houve diferenças quanto a conversão alimentar acumulada (0-42 dias) entre os tratamentos da restrição. O oferecimento de forma intercalada das rações diluídas conferiu menores perdas no ganho de peso e no peso corporal. Não houve diferença quanto a mortalidades entre os tratamentos. As aves não apresentaram crescimento compensatório, o que parece estar associado ao padrão de curva de crescimento apresentada pela linhagem.
An experiment was conducted to determine the effects of the diet dilution on performance of broiler chickens until 42 days of age. Nutrient restriction was achieved by feeding a starter diet (CP 21.5% and ME 3,050 kcal/kg) in which the major ingredients were replaced with 25% or 50% of soybean hulls. Four treatments involved feeding the diluted diets for seven days (7-14 days of age), either continuous or split into periods with the undiluted diet (control). The treatments were: T1: control diet; T2 and T3: diluted diet (25% and 50% of soybean hulls, respectively) 7-14 days; T4 and T5: diluted diet (25% and 50% of soybean hulls, respectively) on days 7, 9, 11 and 13 alternating with T1 (on days 8, 10 and 12). The birds fed with diluted diets exhibited lower mean body weights (P<0.05) than controls. Feed conversion ratios from 0-42 days of age for restricted broilers were not different. Varying the period of nutrient restriction did not affect adversely body weight and body weight gain. There was no statistical difference in the overall mortality through 0-42 days among the dietary treatments. Compensatory growth was not observed, and this result could be associated with the pattern of growth curve exhibited by the hybrids used in this experiment.
An experiment was conducted to determine the effects of the diet dilution on performance of broiler chickens until 42 days of age. Nutrient restriction was achieved by feeding a starter diet (CP 21.5% and ME 3,050 kcal/kg) in which the major ingredients were replaced with 25% or 50% of soybean hulls. Four treatments involved feeding the diluted diets for seven days (7-14 days of age), either continuous or split into periods with the undiluted diet (control). The treatments were: T1: control diet; T2 and T3: diluted diet (25% and 50% of soybean hulls, respectively) 7-14 days; T4 and T5: diluted diet (25% and 50% of soybean hulls, respectively) on days 7, 9, 11 and 13 alternating with T1 (on days 8, 10 and 12). The birds fed with diluted diets exhibited lower mean body weights (P<0.05) than controls. Feed conversion ratios from 0-42 days of age for restricted broilers were not different. Varying the period of nutrient restriction did not affect adversely body weight and body weight gain. There was no statistical difference in the overall mortality through 0-42 days among the dietary treatments. Compensatory growth was not observed, and this result could be associated with the pattern of growth curve exhibited by the hybrids used in this experiment.
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| Reference Key |
mazzuco2000pesquisaefeito
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|---|---|
| Authors | ;HELENICE MAZZUCO;ANTONIO LOURENÇO GUIDONI;FÁTIMA REGINA JAENISCH |
| Journal | proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006 |
| Year | 2000 |
| DOI |
10.1590/S0100-204X2000000300009
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