Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Effects of Increasing Market Weight of Finishing Pigs on Backfat Thickness, Incidence of the 'Caky-fatty' Belly, Carcass Grade, and Carcass Quality Traits

비육돈의 출하체중 증가가 등지방두께, '떡지방' 삼겹살 발생률, 도체등급 및 도체의 품질 특성에 미치는 영향

  • Park, Man Jong (Regional Animal Industry Center, Gyeongnam National University of Science and Technology) ;
  • Park, Byung Chul (Sunjin Co., Ltd.) ;
  • Ha, Duck-Min (Regional Animal Industry Center, Gyeongnam National University of Science and Technology) ;
  • Kim, Jin-Bo (Pusan and Kyungnam Cooperative Swine Farms Association) ;
  • Jang, Kyoung-Soon (Regional Animal Industry Center, Gyeongnam National University of Science and Technology) ;
  • Lee, Do-Hyun (Korean Institute for Animal Products Quality Evaluation) ;
  • Kim, Gwan-Tae (Korean Institute for Animal Products Quality Evaluation) ;
  • Jin, Sang-Keun (Regional Animal Industry Center, Gyeongnam National University of Science and Technology) ;
  • Lee, C. Young (Regional Animal Industry Center, Gyeongnam National University of Science and Technology)
  • 박만종 (경남과학기술대학교 동물생명산업센터) ;
  • 박병철 ((주)선진 기술연구소) ;
  • 하덕민 (경남과학기술대학교 동물생명산업센터) ;
  • 김진보 (부경양돈농협) ;
  • 장경순 (경남과학기술대학교 동물생명산업센터) ;
  • 이도현 (축산물품질평가원) ;
  • 김관태 (축산물품질평가원) ;
  • 진상근 (경남과학기술대학교 동물생명산업센터) ;
  • 이철영 (경남과학기술대학교 동물생명산업센터)
  • Received : 2013.05.17
  • Accepted : 2013.06.21
  • Published : 2013.06.30
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Abstract

The present study was undertaken to investigate the effects of increasing pig market weight on the incidence of the 'caky-fatty' belly, carcass grade and carcass quality traits. To this end, 500 (Yorkshire ${\times}$ Landrace) ${\times}$ Duroc market pigs consisting of equal numbers of barrows and gilts were slaughtered at body weights ranging from 85 to 150 kg and their carcasses were analyzed. Backfat thickness (BFT; mm) of the barrows and gilts regressed on live weight (kg) linearly as follows: BFT (y) = 0.1827x + 3.4825 ($r^2$ = 0.4671) and y = 0.2015x-0.6972 ($r^2$ = 0.4736), respectively. The caky-fatty belly, which, by definition of the present study, had = 55% fat by weight in the dorsal-side half of a 5 cm-wide belly strip between the $11^{th}$ and $12^{th}$ ribs, was found in 10 carcasses from barrows. However, no belly was condemned as 'caky-fatty' by the retailers. Total number of carcasses which were down-graded on account of overweight was as many as 101 (20.2%). The $1^+A$-grade carcasses exhibited a superior intramuscular fat score to all other grades, but except for this and the defective quality traits, no visible differences were found in carcass quality among different carcass grades. In conclusion, the current carcass grading system, which is sparingly reflective of the carcass quality and also under-evaluates the larger but otherwise normal carcasses, may as well be revised. Moreover, the incidence of the caky-fatty belly appears not to be a critical factor to be considered when increasing the pig market weight.

본 연구는 돼지 출하체중 증가가 '떡지방' 삼겹살 발생률, 도체등급 및 도체의 품질 특성에 미치는 영향을 구명하기 위해 수행되었다. 본 목적을 위해 85~150 kg 체중 범위의(Yorkshire ${\times}$ Landrace) ${\times}$ Duroc 교잡종 거세돼지와 암퇘지 각각 250두를 도살하여 그 도체를 분석하였다. 거세돼지와 암퇘지의 등지방두께(y; mm)는 각각 다음과 같이 생체중(x; kg)에 선형으로 회귀하였다: y = 0.1827x + 3.4825 ($r^2$ = 0.4671) 및 y = 0.2015x-0.6972 ($r^2$ = 0.4736). 삼겹살의 제 11~12 늑골부 5 cm 폭의 등쪽 반절편의 지방조직 중량비가 55%를 초과하는 경우를 떡지방의 기준으로 설정했을 때 떡지방 삼겹살은 거세돼지에서 10건 발생하였으나 소매상에서 떡지방 삼겹살로 판정된 경우는 없었다. 과중량으로 인해 도체등급이 강등된 도체는 총 101건(20.2%)에 달하였다. $1^+A$ 등급 도체는 다른 모든 등급 도체보다 근내지방도가 높았으나, 근내지방도와 도체 결함 특성을 제외하면 도체등급간 가시적인 품질 상의 차이는 발견되지 않았다. 결론적으로 도체 품질을 충분히 반영하지 못하고 크기만 클 뿐 정상적인 도체에 대해서는 평가절하는 현행 도체등급 판정 기준은 개정되어야 좋을 것이다. 또한 돼지 출하체중을 증가시킬 때 떡지방 삼겹살 발생률은 중요한 고려 사항이 아닌 것으로 사료된다.

Keywords

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  2. Effects of the Plane of Nutrition on Physicochemical Characteristics and Sensory Quality Traits of the Muscle in Finishing Pigs vol.34, pp.4, 2014, https://doi.org/10.5851/kosfa.2014.34.4.516
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