사료내 조단백질 수준이 진도성견의 질소균형에 미치는 영향

Abstract

This study was conducted to determine the protein requirement level in adult Jindo dog (Korea Jindo Dog) through nitrogen balance experiments. 12 female dogs aged 36~38 weeks old (for early stage) or aged 45~49 weeks old (for late stage) were fed one of 3 diets containing 17, 19 and 21% of crude protein. Body weight of dogs were measured during the 12 days of feeding trial, and feces and urine were collected last 3 days of the trial period. In early stage of Jindo dog, average daily gain of dogs fed experimental diets containing 17, 19 and 21% of crude protein were 38.33, 16.25 and 12.71g/d, respectively. There was a significant differences between 17 and 21% of crude protein treatments (p<0.05) and calculated retained nitrogen were 0.29, 0.04 and 0.03g/kgBW .75 /d, respectively. In late stage of Jindo dog, average daily gain of dogs fed experimental diets containing 17, 19 and 21% of crude protein were 34.05, 28.71 and -28.28g/d, and calculated retained nitrogen were 0.33, 0.06 and 0.09g/kgBW .75 /d, respectively, and were significantly higher (p<0.05) in dogs fed 21% of crude protein diet than those of other dogs. In early stage and late stage of adult Jindo dog, a calculated linear regression equation for nitrogen intake (x) and nitrogen retention (y) were y = 0.7484x 1.18 (R 2 = 0.9923) and y = 0.88231x 1.0894 (R 2 = 0.9982) and the requirement of crude protein were estimated as 9.85g/kg BW .75 /d and 7.72g/kg BW .75 /d from above equation.