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Effects of dietary protease supplementation on growth rate, nutrient digestibility, and intestinal morphology of weaned pigs

随机区组设计 动物科学 干物质 生物 营养物 饲料转化率 空肠 体重 生物化学 内分泌学 农学 生态学
作者
Minho Song,Byeonghyeon Kim,Jin Ho Cho,Hyunjin Kyoung,Sangwoo Park,Jee-Yeon Cho,Kyeong Il Park,Hyeun Bum Kim,Jeong Jae Lee
出处
期刊:Journal of Animal Science and Technology [Korean Society of Animal Science and Technology]
标识
DOI:10.5187/jast.2022.e28
摘要

The addition of dietary proteases (PRO) to weaner diets hydrolyzes soybean-based anti-nutritive factors and improves weaned pig’s dietary digestibility and growth performance. Therefore, this study explores the effects of PRO in a lower crude protein (CP) level diet than that in a commercial diet on the growth performance, nutrient digestibility, and intestinal morphology of weaned pigs. A total of 90 weaned pigs were randomly assigned to 3 dietary treatments with 6 pigs per pen and 5 replicated pens per treatment using a randomized complete block design (block = body weight [BW]): 1) a commercial weaner diet as a positive control (PC; phase1 CP = 23.71%; phase2 CP: 22.36%), 2) lower CP diet than PC as a negative control (NC; 0.61% less CP than PC), and 3) an NC diet with 0.02% PRO. Pigs fed PC and PRO had higher (p < 0.05) final BW, average daily gain, and/or gain to feed ratio for the first three weeks and the overall experimental period than NC. The PC and PRO groups had greater (p < 0.05) apparent ileal digestibility of dry matter, CP, and energy than the NC group. Moreover, pigs fed PC and PRO increased (p < 0.05) apparent total tract digestibility of CP compared with those fed NC. In addition, the PRO group had a higher number of goblet cells than the PC and NC groups. However, pig fed PC and PRO increased (p < 0.05) villus height and height to crypt depth ratio in the ileum compared with those fed NC. In conclusion, PRO supplementation in a commercial weaner diet with low CP levels improves growth rate and nutrient digestibility by modulating the intestinal morphology of weaned pigs.
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