Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effect of Electrolytic Material Feeding on Blood and Carcass Traits of Broiler under Intense Heat Condition in Summer

폭염 시 육계 출하 전 전해질 급여가 닭고기 도체 및 혈액에 미치는 영향

  • 채현석 (농촌진흥청 국립축산과학원) ;
  • 최희철 (농촌진흥청 국립축산과학원) ;
  • 나재천 (농촌진흥청 국립축산과학원) ;
  • 김민지 (농촌진흥청 국립축산과학원) ;
  • 강환구 (농촌진흥청 국립축산과학원) ;
  • 김동욱 (농촌진흥청 국립축산과학원) ;
  • 김지혁 (농촌진흥청 국립축산과학원) ;
  • 조수현 (농촌진흥청 국립축산과학원) ;
  • 이종언 (농촌진흥청 국립축산과학원) ;
  • 김남영 (농촌진흥청 국립축산과학원) ;
  • 최양호 (경상대학교 축산학과) ;
  • 박병성 (강원대학교 동물생명공학과)
  • Received : 2012.07.04
  • Accepted : 2012.08.29
  • Published : 2012.09.30
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Abstract

This study was conducted to investigate the effect of feeding the electrolytic materials on blood and carcass traits of broiler during transportation exposed under intense heat condition in summer. The broilers were selected on the day when the outside temperature was about $32^{\circ}C$ to provide heat stressed environment. Broilers reared for 33 d were selected and fed with the electrolytic materials ($NaHCO_3$, NaCl, KCl) for 2 days. Treatments were as follows; feeding the underground water for control, $NaHCO_3$ (1.0%) + NaCl (0.5%) for treament 1, KCl (0.5%) + NaCl (0.5%) for treatment 2, KCl (1.0%) + NaCl (0.5%) treatment 3, KCl (0.5%) + $NaHCO_3$ (1.0%) + NaCl (0.5%) for treatment 4 and KCl (1.0%) + $NaHCO_3$ (1.0%) + NaCl (0.5%) for treament 5. pH of chicken meat increased for treatments group of electrolytic material, especially, that of treatment 3 was highest when compared to the other treatments. The frequency rate (%) of $1^+$ quality grade were 33.3, 60.0 and 83.3% at control, treatment 3, 4 and treatment 5, respectively. Occurrence rates of PSE were 50% for control and 13.3% for treatment 5. Corticosterone increased at the post-harvest period compared to the pre-harvest period of broiler and have small disparity between pre-and post-harvest only except treatment 3 when compared to control. $pCO_2$ partial pressure of blood at the pre-harvest period was low in all treatments by heat stress, the disparity value of control was high for control, and those of treatment 4 and 5 were low compared to other treatments.

본 연구는 육계 출하 2일 전부터 전해물질을 급여한 후 출하 직전에 혈액을 채취하고, 출하 시 고온 수송 스트레스를 받게 한 후 닭의 혈액을 채취하였으며, 도계 후 닭고기 도체 특성을 조사하여 전해질 종류($NaHCO_3$, KCl, NaCl) 및 급여수준에 따라 혈액 및 도체 특성을 구명하기 위하여 실시하였다. 음수량의 변화에서는 고온 하에서 육계를 출하시 대조구에 비하여 처리 2구를 제외하고 전해물질을 급여한 모든 처리구에서 약간씩 증가하는 경향을 나타내었으며, 특히 처리 4구에서 음수량이 가장 높았다. 계분의 수분 함량은 처리 5구에서 87.13%로 가장 높은 수분량을 나타내었고 대조구에서 수분 함량이 가장 낮았다. 조지방과 조단백질은 대조구에서 가장 높은 함량을 나타내었다. 닭고기 도체의 pH 변화는 대조구에 비하여 전해질을 급여한 모든 처리구에서 증가하였고, 특히 처리 3구에서 가장 높은 pH 값을 나타내었다. 닭고기 $1^+$ 등급 출현율은 대조구가 33.3%인 반면에 처리 3, 4구는 60%, 처리5구는 83.3%으로 고온 스트레스 하에서 전해질 물질을 충분히 급여함에 따라 닭고기 $1^+$ 등급 출현율을 증가시켰다. 닭고기의 PSE 발생율도 대조구는 50%를 나타내었으나, 처리 5구는 13.3%를 나타내어 매우 낮은 수준을 나타내었다. 육계를 출하 시 고온스트레스에 대한 육계의 혈액 중 corticosterone의 변화는 출하 전보다 출하 후 측정값이 상승하였으나, 처리 3구를 제외하고 대조구에 비하여 출하 전과 출하 후의 차이가 적은 것으로 나타났다. ACTH에 대한 변화에서도 출하 전보다 출하 후에 모든 처리구에서 상승하였으며, 출하 후에 처리 5구에서 가장 낮은 ACTH의 함량을 나타내었고, 출하 전 후 차이값도 가장 낮게 나타났다. 혈액의 $pCO_2$ 분압은 출하 전보다 고온 스트레스를 받은 후 전체적으로 낮아졌으며, 출하 전 후의 차이 값은 대조구에서 가장 높았고, 처리 4, 5구에서 대체적으로 낮은 차이 값을 나타내었다. 혈액의 $pO_2$ 분압은 출하 전 후에서 처리별로 일정한 경향을 나타내지 않았다. 이상의 결과로 고온에서 육계 출하 시 수송 스트레스를 저하시키고 닭고기의 품질을 높이기 위하여 전해 물질($NaHCO_3$, NaCl, KCl)을 고루 혼합한 처리 4, 5구가 비교적 우수한 것으로 나타났다.

Keywords

References

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