determinação do período de coleta total de excretas para estimativa dos valores de energia metabolizável em frangos de corte effect of total excreta collection period on estimated values of metabolizable energy in broiler chickens

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ID: 151372
2006
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Abstract
O efeito do período de coleta total das excretas na estimativa da energia metabolizável [aparente (EMA) e corrigida para nitrogênio retido (EMAn)] foi avaliado em frangos de corte de 19 a 23 dias de idade. O delineamento experimental foi composto de cinco tratamentos (1, 2, 3, 4 e 5 dias de coleta total de excretas), com seis repetições, em blocos casualizados, totalizando 300 pintos de corte para a ração-teste e 300 para a ração-referência. A ração-teste foi obtida pela substituição de 40% da ração-referência por milho. Depois de quatro dias para adaptação dos frangos, iniciou-se a coleta das excretas por períodos de 1, 2, 3, 4 ou 5 dias subseqüentes, o que constituiu os tratamentos. Os dados foram avaliados por meio de análise de variância, pelo procedimento GLM do SAS (2001), e as médias foram comparadas pelo teste Tukey. Os valores médios de energia metabolizável para o milho, com base na matéria natural, nos períodos de coleta de 1, 2, 3, 4 e 5 dias, com seus respectivos coeficientes de variação (%), para EMA (kcal/kg) foram 3.814 (7,26), 3.511 (5,32), 3.563 (2,51), 3.512 (1,31) e 3.489 (1,00) e, para EMAn (kcal/kg), 3.709 (6,68), 3.434 (4,85), 3.482 (2,31), 3.438 (1,11) e 3.423 (1,03), respectivamente. O período de coleta total de excretas de quatro dias é suficiente para gerar dados de EM do milho de igual confiabilidade aos apresentados com cinco dias.
The effects of total excreta collection period length on estimated values of metabolizable energy [apparent (AME) and nitrogen corrected (AMEn)] were evaluated in broiler chickens from 19 to 23 days of age. Five treatments with six replicates were used in a randomized block design, in a total of 300 broiler chicks for the control and 300 broiler chicks for the reference diet. The control replaced 40% of reference diet with corn. After diet adaptation (four days), total excreta collection was performed during 1, 2, 3, 4 or 5 days, that consisted the treatments. Data were submitted to ANOVA using the GLM procedure of SAS (2001), with subsequent multiple mean comparison using Tukey test. Observed mean values of metabolizable energy for corn, as-fed basis, for the collection periods (1, 2, 3, 4 or 5 days) with the respective coefficients of variation (%), for AME (kcal/kg) were: 3,814 (7.26), 3,511 (5.32), 3,563 (2.51), 3,512 (1.31), and 3,489 (1.00) and for AMEn (kcal/kg) were: 3,709 (6.68), 3,434 (4.85), 3,482 (2.31), 3,438 (1.11), and 3,423 (1.03), respectively. It was concluded that a 4-d collection period is recommended to compose corn ME data with the same confidence as those of 5-d collection period.
Reference Key
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Authors ;Valdir Silveira de Avila;Aline Paula;Paulo Antônio Rabenschlag de Brum;Arlei Coldebella;João Carlos Maier
Journal european journal of lipid science and technology
Year 2006
DOI
10.1590/S1516-35982006000700012
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982006000700012
Keywords
broiler chickens

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