Influence of exogenous enzymes ensiled with orange pulp on digestion and growth performance in lambs

Abstract

Twenty-four Ossimi male lambs were used to evaluate effects of inclusion of ensiled orange pulp (EOP) in lamb diets either with or without addition of exogenous enzymes (ENZ) of ZADO® on digestion and growth performance. Lambs (21.1±1.01kg body weight (BW)) were assigned to one of three groups of 8 animals/group in a randomized complete block design being: Control (basal diet with 0g/kg EOP), EOP (Control with 150g/kg EOP) or EOP+ENZ (EOP with 5g/kg of ZADO®) in a 90-day experiment. Ensiling the orange pulp increased the crude protein, ether extract and metabolizable energy of the silage by 29, 46 and 8%, respectively, and reduced the secondary metabolites, such as total phenolics, saponins and alkaloids. Silage lactic acid and ethanol were increased by 35% and 54%, respectively for EOP and EOP with ENZ, but all silage quality parameters were in the normal range. Concentration of NH₃-N before feeding was decreased (P <0.05) by 11 and 13% in EOP and EOP+ENZ, respectively, whereas at 3 and 6h after feeding ruminal VFA concentration was increased (P <0.05) by 23 and 9% respectively, only in EOP+ENZ lambs. NDFom intake was increased (P =0.036) by 52 and 59%, whereas the ADFom increased (P =0.032) by 8 and 11% in EOP and EOP+ENZ lambs, respectively. Nutrients digestion were higher (P <0.05) in EOP+ENZ than EOP lambs. Digestible DM was increased by 18%, whereas the fiber fractions (NDFom and ADFom) were increased by 93 and 47% with similar EOP+ENZ. DM intake amo