The effect of feeding fresh swine manure, poultry waste, urea, molasses and bakery by-products ensiled for lambs

Introduction The use of by-products such as swinemanure (SM), poultry waste (PW), urea (U), molasses(M) and bakery by-product (BB) is an alternative methodfor lamb feeding. The objective of the present study was todetermine the chemical composition, dry matter intake anddigestibility in growing lambs using ensiled PW combinedwith BB (PWBB), SM with BB (SMBB), SM with M(SMM) and U with M (UM) in their diets.Methods Four silages—PWBB, SMBB, SMM and UM—were prepared, the chemical composition of the silages wasdetermined (n = 3), silages and concentrate ratio (60:40)as fresh matter were given to growing lambs over 21 daysas total period, and the collection of samples to determineintake and digestibility was carried out for the last 7 days,in a 4 9 4 Latin square design, with a significance levelP.05.Results The organic matter (OM) was lower (P.05)in silage with SMM (886 g/kg), and crude proteinincreased with UM (206 g/kg) followed by PWBB (170 g/kg). DM, OM, NDF and ADF intake was higher (P.05)in UM diets compared with the rest of the treatments; ADFdigestibility was lower (P.05) for SMM (389 g/kg)than UM (417 g/kg) diets. N intake was higher (P.05)in UM (51.3 g N/day) diets than the rest of the treatments(39.9 ± 1.3 g N/day).Conclusions The use of PWBB, SM combined with BBor M is an alternative method for lamb feeding, providedthat a proper formulation supplies the nutrient requirementsof crude protein and diminish the N excretion comparedwith UM diet.