137. Inclusion of xylanase and phytase to nutrient deficient diets restore growth performance, and bone characteristics improving sustainability

Abstract

A new enzyme application with a high dose of phytase and xylanase called Maximum Matrix Nutrition (MMN) to degrade both phytate and non-starch polysaccharides to maintain performance while providing a cheaper diet. An experiment was conducted to determine the impact of supplementation with phytase and xylanase on nutrient deficient diets on growth performance, bone mineralization and carbon footprint (CO2e) in growing pigs. Diets consisted of an industrial control (IC) with the inclusion of 500 FTU/kg of an E.coli phytase and applying a mineral matrix reduction only (Ca, P, and Na); a negative control (NC1) reduced (Ca, P, Lys, and AA) nutrient diet; a negative control (NC2) nutrient and energy reduced diet (−120 kcal/kg), and both NC diets (NC1+ENZ, NC2+ENZ) supplemented with both phytase (2000 FTU/kg) and xylanase (9600 BXU/kg). The mineral matrix on the NC diets was limited to 0.20% avP and 0.22% Ca due to the phytate level in the diet. Animals were fed in two phases: 20 to 40 kg and 40 to 75 kg. One hundred-sixty pigs (23.5 + 3.51 kg) housed in 40 pens (4 pigs/pen) were used. At the end, one pig per pen was euthanized, and metatarsus bones were collected. The experiment was designed as a randomized complete block, and data was analyzed by the GLM procedure of SAS. Both NC diets showed a reduced growth performance and feed efficiency (P < 0.001), as well as reduced bone parameters (P < 0.001). Dietary supplementation with both enzymes restored growth, feed efficiency, bone parameters to the same level as IC diets (P > 0.05). It can be concluded that using a high dose of phytase and xylanase enabled a reduction in formulation cost, improved performance growth and reduced CO2e emissions from animals fed less dense diets. In this case a 3% reduction in carbon footprint in pig production was achieved by using MMN compared with the current IC.