Effects of adding high‐dosing Aspergillus oryzae phytase to corn–wheat–soybean meal‐based basal diet on growth performance, nutrient digestibility, faecal gas emission, carcass traits and meat quality in growing‐finishing pigs

Abstract

This study tests the effects of supplementation of high-dosing Aspergillus oryzae phytase into the corn-wheat-soybean meal (SBM)-based basal diet on growth performance, nutrient digestibility, faecal gas emission, carcass traits and meat quality in growing-finishing pigs (29.73-110.86 kg live weight; 70-day-old to 166-day-old).A total of 56 crossbred pigs [(Landrace × Yorkshire) × Duroc] were divided into two dietary groups for a 96-day experiment (growing period, days 0-42; finishing period, days 43-96) with a completely randomized block design. There were seven replicate pens in each dietary group, and each pen has four pigs (two barrows and two gilts).The dietary treatments consisted of a corn-wheat-SBM-based nutrient sufficient basal diet or the basal diet supplemented with 1500 FTU/kg A. oryzae phytase. One phytase unit (FTU) was defined as the amount of enzyme that catalyses the release of one micromole phosphate from phytate/min at 37°C and pH 5.5. Higher average daily gain and lower feed conversion ratio were observed in growing-finishing pigs consuming a high-dosing A. oryzae phytase supplementing diet during days 0-42 and 0-96. Supplementing high-dosing A. oryzae phytase to the diet of growing-finishing pigs increased apparent total tract digestibility of phosphorus on days 42 and 96. Moreover, growing-finishing pigs fed the diet supplemented with high-dosing A. oryzae phytase had higher carcass back-fat thickness than those fed the control diet. However, the faecal gas emission and meat quality were not affected by high-dosing A. oryzae phytase supplementation. In conclusion, dietary supplementation of high-dosing A. oryzae phytase (1500 FTU/kg) had beneficial effects on the growth performance, apparent phosphorus digestibility and carcass back-fat thickness in growing-finishing pigs.

Phytase Supplementation of Growing-Finishing Pig Diets with Extruded Soya Seeds and Rapeseed Meal Improves Bone Mineralization and Carcass and Meat Quality

“…In addition, phytase reduces the necessary complement of minerals from non-renewable sources to diets, reducing nutritional costs as well as phosphorus emissions into the environment [ 7 , 12 , 13 ]. Some studies have also shown that phytase at higher doses (above 2500 FTU/kg) results in a more favorable growth performance in pigs than standard phytase doses (usually levels well over 500 FTU/kg and up to 2500 FTU/kg) [ 14 , 15 , 16 ]. On the other hand, it has been found that dietary supplementation with high doses of phytase can have some beneficial effects on carcass quality parameters such as back-fat thickness in growing–finishing pigs [ 16 ].…”

“…Some studies have also shown that phytase at higher doses (above 2500 FTU/kg) results in a more favorable growth performance in pigs than standard phytase doses (usually levels well over 500 FTU/kg and up to 2500 FTU/kg) [ 14 , 15 , 16 ]. On the other hand, it has been found that dietary supplementation with high doses of phytase can have some beneficial effects on carcass quality parameters such as back-fat thickness in growing–finishing pigs [ 16 ]. Cauble et al [ 17 ] and Gebert et al [ 18 ] reported that dietary phytase could moderate muscle fatty acid profiles in chickens and pigs.…”

Microbial Phytase in a Diet with Lupine and Extruded Full-Fat Soya Seeds Affects the Performance, Carcass Characteristics, Meat Quality, and Bone Mineralization of Fatteners

“…The use of microbial phytase in feed mixtures with legume seeds has been evaluated in only a few nutritional tests so far, but the current research focuses on examining the effectiveness of the use of phytase in fatteners under typical commercial production conditions [9]. Some studies have shown that phytase in higher doses results in more advantageous growth performances in pigs than when using standard phytase doses (usually levels well over 500 FTU/kg and up to 2500 FTU/kg) [13][14][15][16]. On the other hand, feed mixtures with higher enzyme doses can be more expensive.…”