Data/hora: 10/06/2024 09:21:19

Provedor de dados: | 96
País: | Brazil
Título: | Bioavailability and poultry fecal excretion of phosphorus from soybean-based diets supplemented with phytase
Autores: | Martins,Bianca Almeida Brandão; Borgatti,Laura Maria de Oliveira; Souza,Luiz Waldemar de Oliveira; Robassini,Simi Luiza Durante Aflalo; Albuquerque,Ricardo de.
Data: | 2013-03-01
Ano: | 2013
Palavras-chave: | Available phosphorus; Bone ash; Broiler; Phosphorus excretion; Phytate; Wheat meal.
Resumo: | Five hundred and four 1-day-old Cobb broiler chickens were randomly allotted to 18 treatments and fed a semi-purified basal diet (4 g/kg total phosphorus) supplemented with 2 levels of supplemental P (0.5 or 1 g/kg) during 21 days to evaluate performance and bone mineralization; to assess the relative bioavailability of P (RBP) in wheat meal (WM) and roasted (RS) or extruded soybean meal (ES), with or without phytase (0 or 750 ftu/kg diet), using dicalcium phosphate (DC) as standard; and to estimate phosphorus excretion. Weight gain (WG), feed intake (FI), feed to gain ratio (FG), and tibia ash weigh (AW) were assessed. For each source, the RBP was calculated by the slope ratio method, when tibia ash weight was regressed on P ingested. Ingested and fecal P was determined to calculate P intake, and P excretion and excretion rate. Phytase addition increased overall FI, WG, and FG ratio by 3.3, 2.6 and 0.8%, respectively, but differences were not significant. Overall AW was increased by 10.8% after the enzyme inclusion in the diets. The relative bioavailability of phosphorus values of tested WM, RS, and ES were increased by 6.32, 64.32, 76.99%, respectively, in response to supplementation of phytase in diets containing WM, RS, and ES, respectively. Phytase reduced P excretion by 12.7% and the excretion rate by 15.0%, regardless of the phosphorus source or level.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000300005
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/S1516-35982013000300005
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.42 n.3 2013
Fonte: | info:eu-repo/semantics/openAccess