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Effects of different levels of crude protein and protease on nitrogen utilization, nutrient digestibility, and growth performance in growing pigs

한국축산학회지 2020년 62권 5호 p.659 ~ 667
김용주, Kim Tae-Heon, 송민호, 안지선, Yun Won, 이지환, 오한진, 이준성, 김곡미, 김현범, 조진호,
소속 상세정보
김용주 ( Kim Yong-Ju ) - Chungbuk National University Division of Food and Animal Science
 ( Kim Tae-Heon ) - Chungbuk National University Division of Food and Animal Science
송민호 ( Song Min-Ho ) - Chungnam National University Department of Animal Science and Biotechnology
안지선 ( An Ji-Seon ) - Chungbuk National University Division of Food and Animal Science
 ( Yun Won ) - Chungbuk National University Division of Food and Animal Science
이지환 ( Lee Ji-Hwan ) - Chungbuk National University Division of Food and Animal Science
오한진 ( Oh Han-Jin ) - Chungbuk National University Division of Food and Animal Science
이준성 ( Lee Jun-Soeng ) - Chungbuk National University Division of Food and Animal Science
김곡미 ( Kim Gok-Mi ) - Yonam College Department of Beauty Art
김현범 ( Kim Hyeun-Bum ) - Dankook University Department of Animal Resources Science
조진호 ( Cho Jin-Ho ) - Chungbuk National University Division of Food and Animal Science

Abstract


This study was conducted to evaluate the effects of different levels of crude protein (CP) and protease on nitrogen (N) utilization, nutrient digestibility, and growth performance in growing pigs. A total of six crossbred ([Landrace × Yorkshire] × Duroc) barrows were individually accepted in 1.2 m × 0.7 m × 0.96 m stainless steel metabolism cages. The pigs (average initial body weight of 27.91 ± 1.84 kg) randomly assigned to six diets with six weeks (6 × 6 Latin square design). The experiment was carried out in an environment with a temperature of 23 ± 1.5°C, a relative humidity of 83 ± 2.3% and a wind speed of 0.25 ± 0.03 m/s. The dietary treatments were arranged in a 2 × 3 factorial design with two levels of CP (15.3% or 17.1%) and three levels of protease (0 ppm, 150 ppm, or 300 ppm). The average daily gain and gain to feed ratio (G:F) tended to increase (p = 0.074) with increasing amounts of protease. The low CP level diet reduced (p < 0.050) urinary and fecal N concentrations, the total N excretion in feces, and increased (p < 0.050) N retention. Different protease levels in the diet did not affect (p > 0.05) at N intake, but supplementation of the diets with 300 ppm protease decreased (p < 0.050) the N concentration in urine and feces and tended to increase (p = 0.061) the percentage of N retention retained of the total N intake. The dietary CP level did not affect (p > 0.050) the apparent total tract digestibility (ATTD) of dry matter, digestible energy (DE), and metabolic energy (ME), but diet supplementation with 300 ppm protease showed higher (p < 0.050) ATTD of DE and ME than in the protease-free diet. Therefore, a low protein diet with protease could improve the utilization of nitrogen, thereby reducing the negative effect of N excretion into the environment while maintaining or increasing growth performance compared to a high protein diet.

키워드

Protein; Protease; Nitrogen; Digestibility; Growing pigs

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