사료내 조단백질 수준이 진도성견의 질소균형에 미치는 영향
Effects of Crude Protein Levels on Nitrogen Balance in Adult Jindo Dog
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본 연구는 진도성견의 단백질 급여수준이 질소균형에 미치는 영향을 조사하여 단백질 급여 표준을 설정하기 위한 기초 자료를 얻기 위하여 실시하였다. 진도견 성견초기(생후 36~38주령)와 성견후기(생후 45~49주령)의 암컷 12두를 대상으로 단백질 수준을 17, 19 및 21%로 설정한 실험사료를 급여하여 체중, 사료섭취량 및 분뇨 배설량을 측정하였다. 성견초기의 일당 증체량은 조단백질 함량 17, 19 및 21%구에서 각각 －38.33, －16.25 및 －12.71g으로 나타났으며 17% 조단백질 사료급여구가 19 및 21% 급여구에 비하여 유의하게 낮았다(p<0.05). 축적된 질소량은 각각 －0.29, －0.04 및 －0.03g/kgBW0.75/d로 계산되었으며 조단백질 17% 급여구가 19 및 21% 급여구에 비하여 유의하게(p<0.05) 낮은 결과를 나타내었다. 질소섭취량(x)과 질소축적량(y)간에 y=0.7484x－1.18(R2=0.9923)의 회귀식이 도출되었으며, 이 식으로부터 성견초기의 유지 조단백질 요구량은 9.85g/kgBW0.75/d로 추정되었다. 진도견 성견후기의 일당 증체량은 실험구 별로 각각 －34.05, －28.71 및 －28.28g으로 17% 단백질 사료급여구가 다른 구에 비하여 낮게 나타났으나 유의한 차이는 아니었다. 축적된 질소량은 각각 －0.33, －0.06 및 －0.09g/kgBW0.75/d로 계산되었으며 17% 조단백질 급여구가 19 및 21% 급여구에 비하여 유의하게(p<0.05) 낮은 결과를 나타내었다. 질소섭취량(x)과 질소축적량(y)간에 y= 0.8823x－1.0894(R2=0.9982)의 회귀식이 도출되었으며 이 식을 이용하여 계산한 결과 성견후기의 유지 조단백질 요구량은 7.72g/kgBW0.75/d로 추정되었다. 본 연구는 우리나라에서 진도견을 대상으로 한 영양소 요구량을 설정하기 위한 최초의 연구로 생각되며 연구의 결과는 진도견의 단백질 요구량을 설정하는데 기초 자료가 될 것으로 생각된다. 그러나 진도견의 단백질 요구량을 최종적으로 설정하기 위해서는 전 생애에 걸쳐서 성별 및 사육환경에 따른 영양소 요구량에 대한 추가적인 연구가 필요하다고 사료된다.
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(R2=0.9923) and y=0.88231x－1.0894(R2=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.
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