Abstract

GONZALEZ, Andrea  and  BAUZA, Roberto. Nutritional Value of Feathers Treated by Two Methods of Hydrolysis for Feeding Growing Pigs. Agrociencia Uruguay [online]. 2010, vol.14, n.2, pp.55-65. ISSN 1510-0839.

A total of 18 pigs of average weight 45 kg, were used in two experiments to evaluate two products of  hydrolysis of feathers: feathers treated with NaOH (QH), and treated with vapour pressure (PH). In E1, treatments were: RR1: reference ration; RQH: replacement of 18% of dry matter (DM) of RR1 by QH; RPH: replacement of 18% of DM of RR1 by PH. In E2, treatments were: RR2: ration reference; DQH: replacement of 1/3 of crude protein (DCP) by CP of QH; DLQH: DQH diet supplemented with 0.25% lysine. The variables evaluated in E1 were apparent digestibility (Dap) of DM, organic matter (OM), crude protein (CP) and energy (E), and E2 were Dap of DM, CP, apparent biological value (VBap) and net protein value (NPV) of diets containing QH. The PH had smaller values for all variables studied (P <0.05). The Dap of OM and CP for RQH were lower (P <0.05) respect to RR1. The BVap of diet protein was: 71.5, 44.3, 51.1 for RR2, DQH, DLQH respectively. It is concluded that treatment with pressure and temperature did not provide an acceptable product. Feathers treated with NaOH obtained adequate values of digestibility. The inclusion of QH in diets for pigs reduced the BVof the CP and the contribution of lysine was not enough (P> 0.05) to improve this indicator.

Keywords : hydrolyzed feather; apparent digestibility; net protein value; biological value.

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