2008
DOI: 10.1590/s1516-35982008000300012
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Abstract: RESUMO -Um ensaio de digestibilidade foi conduzido para determinar a energia metabolizável (EMAn), os coeficientes de digestibilidade da matéria seca -MS (CDMS), a excreção e os coeficientes de retenção aparente do fósforo (P), nitrogênio (N), cálcio (Ca), potássio (K), cobre (Cu) e zinco (Zn). Duzentos e cinqüenta pintos de corte, machos, foram distribuídos em um esquema fatorial 3 × 3 + 1 (três níveis de fósforo disponível -0,25; 0,34 e 0,45%, três níveis de proteína bruta (PB) -15,0; 17,0 e 19,0% e uma raçã… Show more

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Cited by 22 publications
(38 citation statements)
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References 16 publications
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“…When diets with 16% of crude protein were used, the increase of AMEn was observed only if the energy values were raised during the formulation (P<0.05). These results contradict those obtained by Silva et al (2008), who observed an increase of apparent metabolizable energy when decreased dietary crude protein. According to these authors, the reduction of dietary nitrogen decreases the excretion of this element by birds, improving the energy use when the nitrogen balance is corrected.…”
Section: Resultscontrasting
confidence: 99%
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“…When diets with 16% of crude protein were used, the increase of AMEn was observed only if the energy values were raised during the formulation (P<0.05). These results contradict those obtained by Silva et al (2008), who observed an increase of apparent metabolizable energy when decreased dietary crude protein. According to these authors, the reduction of dietary nitrogen decreases the excretion of this element by birds, improving the energy use when the nitrogen balance is corrected.…”
Section: Resultscontrasting
confidence: 99%
“…For zinc, diets with 3,250 kcal of AMEn/kg promoted better results. Silva et al (2008) observed reduction of nitrogen, zinc and also copper in excrements of the broilers from 1 to 21 days of age using phytase in diets with reduced crude protein containing synthetic amino acids. Laurentiz et al (2009), working with normal levels of crude protein for growing broilers found no effect of phytase on the excretion of copper or zinc but significant reduction of phosphorus using 500 or 1,000 PTU/kg.…”
Section: Resultsmentioning
confidence: 87%
“…Diversos pesquisadores relataram o efeito da fitase aumentando a disponibilidade do fósforo fítico de ingredientes vegetais para aves (Viveros et al, 2002;Santos et al, 2008;Silva et al, 2008). Entretanto, os dados relativos à atividade da fitase sobre a disponibilidade de outros nutrientes os dados são inconsistentes, indicando a necessidade de mais investigações sobre o assunto.…”
Section: Resultsunclassified
“…Estes resultados estão de acordo com os encontrados por Silva et al (2008) e Gomide et al (2011), que também observaram redução no consumo e na excreção de fósforo quando as rações são formuladas com menores níveis de fósforo disponível e suplementadas com fitase.…”
Section: Resultsunclassified
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