Kim Yong Ju, Lee Ji Hwan, Kim Tae Heon, Song Min Ho, Yun Won, Oh Han Jin, Lee Jun Soeng, Kim Hyeun Bum, Cho Jin Ho
Division of Food and Animal Science, Chungbuk National University, Cheongju 28644, Korea.
Department of Animal Science and Biotechnology, Chungnam National University, Daejeon 34134, Korea.
J Anim Sci Technol. 2021 May;63(3):491-500. doi: 10.5187/jast.2021.e49. Epub 2021 May 31.
The objective of this study was to evaluate the effects of low protein diets added with protease on growth performance, nutrient digestibility, and blood profiles of weaned piglets and growing-finishing pigs. A total of 96 weaned pigs ([Yorkshire × Landrace] × Duroc) with average body weight (BW) of 6.99 ± 0.21 kg were used in a 20-week experiment. The dietary treatments were arranged in a 2 × 3 factorial design. Treatments were as follows: In phase 1 (1-2 weeks), two protein levels as high protein (HP; 19.0%), low protein (LP; 17.0%), and three protease (PT) levels (PT0, 0%; PT1, 0.3%; and PT2, 0.5%); in phase 2 (3-4 weeks), protein levels (HP, 18.05%; LP, 16.15%) and protease levels (0%, 0.3%, and 0.5%); in phase 3 (5-12 weeks), protein levels (HP, 17.1%; LP, 15.3%) and protease level (0%, 0.15%, and 0.3%); in phase 4 (13-20 weeks), protein levels (HP, 16.15%; LP, 14.45%) and protease level (0%, 0.15%, and 0.3%). At 4 weeks and 20 weeks after treatment, BW was higher ( < 0.050) in the PT2 group than PT0 group. From weeks 0 to 4, average daily gain (ADG) and feed efficiency (G/F) were higher ( = 0.006 and = 0.014; = 0.014 and = 0.044, respectively) in the PT2 group than PT0 and PT1 groups. From weeks 16 to 20, ADG and G/F were higher ( < 0.001 and = 0.009; = 0.004 and = 0.033, respectively) in the PT2 group than PT0 and PT1 groups. Crude protein (CP) digestibility was higher ( = 0.013, = 0.014, and = 0.035, respectively) in the low protein (LP) group than high protein (HP) group at weeks 4, 12, and 20. At weeks 4 and 20, the LP diet group had lower ( < 0.001 and = 0.001, respectively) blood urea nitrogen (BUN) levels than the HP diet group. Therefore, a low CP diet added with protease could increase growth performance and CP digestibility of weaned piglets and growing-finishing pigs.
本研究的目的是评估添加蛋白酶的低蛋白日粮对断奶仔猪和生长育肥猪生长性能、养分消化率及血液指标的影响。选用96头平均体重（BW）为6.99±0.21 kg的断奶仔猪（[约克夏×长白]×杜洛克）进行为期20周的试验。日粮处理采用2×3析因设计。处理如下：第1阶段（1 - 2周），两个蛋白水平，即高蛋白（HP；19.0%）、低蛋白（LP；17.0%），以及三个蛋白酶（PT）水平（PT0，0%；PT1，0.3%；PT2，0.5%）；第2阶段（3 - 4周），蛋白水平（HP，18.05%；LP，16.15%）和蛋白酶水平（0%，0.3%，0.5%）；第3阶段（5 - 12周），蛋白水平（HP，17.1%；LP，15.3%）和蛋白酶水平（0%，0.15%，0.3%）；第4阶段（13 - 20周），蛋白水平（HP，16.15%；LP，14.45%）和蛋白酶水平（0%，0.15%，0.3%）。处理后4周和20周时，PT2组的BW高于PT0组（<0.050）。从第0周开始至4周，PT2组的平均日增重（ADG）和饲料效率（G/F）高于PT0组和PT1组（分别为=0.006和=0.014；=0.014和=0.044）。从第16周开始至20周，PT2组的ADG和G/F高于PT0组和PT1组（分别为<0.001和=0.009；=0.004和=0.033）。在第4周、12周和20周时，低蛋白（LP）组的粗蛋白（CP）消化率高于高蛋白（HP）组（分别为=0.013、=0.014和=0.035）。在第4周和20周时，LP日粮组的血液尿素氮（BUN）水平低于HP日粮组（分别为<0.001和=0.001）。因此，添加蛋白酶的低CP日粮可提高断奶仔猪和生长育肥猪的生长性能及CP消化率。
