Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effect of Stocking Density and Dietary Protein Level on Performance, Meat Quality and Serum Corticosterone of Slow-Growing Korean Meat-Type Chicken (Hanhyop 3)

사육밀도와 사료 단백질 수준이 저속 성장 육계(한협 3호)의 성장, 육질, 혈청 Corticosterone에 미치는 영향

  • 이준엽 (국립축산과학원 축산환경과) ;
  • 이정헌 (강원대학교 동물생명과학대학) ;
  • 이명호 (강원대학교 동물생명과학대학) ;
  • 송영한 (강원대학교 동물생명과학대학) ;
  • 이종인 (강원대학교 동물생명과학대학) ;
  • 오상집 (강원대학교 동물생명과학대학)
  • Received : 2016.10.07
  • Accepted : 2016.11.17
  • Published : 2016.12.31
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Abstract

A total of 720 slow-growing Korean meat-type (Hanhyop 3) chicken were used to evaluate the effect of stocking densities and dietary protein levels on growth performance, meat quality, bone mineral composition, and serum corticosterone. Three (6.3, 9.5, and $12.6birds/m^2$) stocking densities and two dietary protein levels (19% and 18%) were factorially ($3{\times}2$) arranged for six treatments. Overall body weight gain (BWG) was highest (p<0.001) at the lowest stocking density ($6.3birds/m^2$). The feed intake (FI) of birds at the highest density ($12.6birds/m^2$) was lower than that of birds at the other densities, but resulted in better feed/gain (F/G). Among 18% protein groups, the overall FI of birds at $9.5birds/m^2$ was higher than that at the lowest density; therefore, birds at $9.5birds/m^2$ had poorer F/G than birds at the lowest density during days 61~75. Difference in F/G among densities was only significant (p<0.05) during days 61~75 but not significant (p>0.05) during days 41~60. Although there were no significant differences (p>0.05) in BWG and F/G between 19% and 18% dietary protein levels, FI of the 18% protein diet was less (p<0.05) than that of the 19% diet. Although there was no difference (p>0.05) in meat TBARS values, meat color differed (p<0.05) with stocking density and dietary protein levels. There was no effect (p>0.05) of stocking density and dietary protein levels on bone mineral composition. Serum corticosterone concentration increased (p<0.05) with increasing stock density but was not affected (p>0.05) by dietary protein levels. This study indicated that a density of $12.6birds/m^2$ is not recommended for slow-growing chickens. Between 19% and 18% dietary protein levels, 18% would be recommended for the Korean Hanhyop 3 chicken in the finishing stage.

세 수준(6.3, 9.5, 12.6 수/$m^2$)의 사육밀도와 사료 단백질 수준(19%, 18%)이 저속성장 육계(한협 3호)의 육성성적, 영양소 이용률, 닭고기 저장성, 육색, 계육 성분 및 뼈의 광물질 조성과 혈청 corticosterone 함량에 미치는 영향을 조사하였다. 사육 밀도는 한협 3호 육성성적에 유의적인 영향을 미치는 것으로 나타났다. 증체량은 저 밀도인 6.3 수/$m^2$ 구에서 가장 높았으며, 고밀도(12.6 수/$m^2$) 구에서 가장 낮았다. 특히 고사육 밀도에서는 사료섭취량이 유의적으로 감소한 것으로 나타났다. 그러나 낮은 사료섭취량으로 인하여 고사육 밀도 계군의 사료요구율이 타 사육 밀도 계군의 사료요구율에 비하여 상대적으로 낮았다. 고밀도 계군에서의 사료 섭취량 저하와 낮은 사료요구율은 41~60일 구간보다는 61~75일 구간에 현저하게 나타났는데, 그 영향으로 전 사육기간의 사료섭취량과 사료요구율도 차이가 나타났다. 본 연구에서 사료 단백질 1% 차이는 증체량과 사료요구율에 차이를 나타내지 않았다. 다만 41~75일 구간 사료섭취량은 단백질 19% 구에 비하여 오히려 18% 구에서 낮았다. 저장 중 계육의 TBARS 값은 처리구간에 차이가 없었다. 하지만 계육의 적색도와 명도는 사료 단백질 수준에 따라, 황색도는 사육 밀도에 따라 차이가 나타났다. 가슴육의 단백질 함량과 다리육의 Ca과 P의 함량은 각각 사료 단백질 수준과 사육밀도에 영향을 받았다. 사료의 단백질 수준과 사육밀도는 뼈의 회분함량 및 회분 중 Ca과 P의 함량에는 영향을 미치지 않았다. 혈청 corticosterone 함량은 사육밀도가 낮을수록 낮게 나타났으나, 사료 단백질 수준에 따른 차이는 없었다. 본 연구 결과, 저속성장 육계 한협 3호 사육후기 단계에 고사육 밀도(12.6 수/$m^2$)로 사육하는 것은 생산성을 하락시킬 뿐 아니라, 혈청 corticosterone 함량도 높이므로 바람직하지 않음을 알 수 있었다. 또한 한협 3호 육계의 후기 사료 단백질을 18% 수준으로 설계하더라도 생산성에 차이가 없음을 알게 되었다.

Keywords

References

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