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http://dx.doi.org/10.5187/jast.2021.e49

Effect of low protein diets added with protease on growth performance, nutrient digestibility of weaned piglets and growing-finishing pigs  

Kim, Yong Ju (Division of Food and Animal Science, Chungbuk National University)
Lee, Ji Hwan (Division of Food and Animal Science, Chungbuk National University)
Kim, Tae Heon (Division of Food and Animal Science, Chungbuk National University)
Song, Min Ho (Department of Animal Science and Biotechnology, Chungnam National University)
Yun, Won (Division of Food and Animal Science, Chungbuk National University)
Oh, Han Jin (Division of Food and Animal Science, Chungbuk National University)
Lee, Jun Soeng (Division of Food and Animal Science, Chungbuk National University)
Kim, Hyeun Bum (Department of Animal Resource and Science, Dankook University)
Cho, Jin Ho (Division of Food and Animal Science, Chungbuk National University)
Publication Information
Journal of Animal Science and Technology / v.63, no.3, 2021 , pp. 491-500 More about this Journal
Abstract
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 (p < 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 (p = 0.006 and p = 0.014; p = 0.014 and p = 0.044, respectively) in the PT2 group than PT0 and PT1 groups. From weeks 16 to 20, ADG and G/F were higher (p < 0.001 and p = 0.009; p = 0.004 and p = 0.033, respectively) in the PT2 group than PT0 and PT1 groups. Crude protein (CP) digestibility was higher (p = 0.013, p = 0.014, and p = 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 (p < 0.001 and p = 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.
Keywords
Protein; Protease; Growth performance; Nutrient digestibility; Pigs;
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