Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Comparisons between Two Different Eggshell Lines on Egg Traits and Egg Production Rate in Layers

계란의 형질들 및 산란율에 대한 난각색이 다른 두 계통간의 비교 연구

  • 석윤오 (삼육대학교 생명자원과학부 응용동물학과)
  • Published : 2002.09.01
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Abstract

The objective of this study was to compare the two different eggshell lines of commercial layers on egg traits and egg production rate. Hy-line W-98 (white shell line; WSL) and Hy-line Brown (brown shell line; BSL) were used as experimental stocks. The birds in each line were allocated to three floor pens each containing 25-birds. They were fed a ration containing 15.5% CP and 2,700 ㎉/kg ME, and were supplied 16 h of light per day throughout the experimental Periods. The egg traits and egg Production rate were measured from 53 to 56-wk-old and 20 to 56-wk-old, respectively. The mean egg weight and the mean percentage albumen were significantly heavier and higher (P<0.05) in the BSL than in the WSL, respectively. The mean eggshell thickness and the mean percentage shell were also significantly thicker and higher (P<0.05) in the BSL than those in the WSL, respectively. However, the mean percentage yolk and the yolk to albumen ratio showed a reverse trend as shown in the mean percentage albumen or percentage eggshell. Although the WSL birds started laying 4 d earlier than the BSL ones, the overall mean egg Production rate for BSL during 20 to 56 wk of age was significantly higher (P<0.05) by 6.6% than the WSL. It was concluded that the eggs of brown eggshell line had heavier egg weight and thicker shell, and they had more percentage of albumen, but less percentage of yolk than those of the white eggshell line. These results suggest that the brown eggshell line raised on the floor might be more beneficial than the white eggshell line not only for the preference of the table egg consumers, but also for the efficient production of the eggs.

백색란 계통인 Hy-line W-98과 갈색란 계통인 Hy-line Brown을 이용하여 주요 계란형질들과 산란율에 대한 닭의 계통간의 차이를 구명하고자 시험한 결과, 각 시험주령별 평균 난중에 있어서 백색란 계통과 갈색란 계통간에 유의한 차이는 나타나지 않았으나, 전체 평균 난중은 백색란 계통이 63.57 g 이었고, 갈색란 계통이 64.43 g으로서 갈색란 계통의 계란이 0.86 g이 더 무거운(P<0.05) 것으로 나타났다. 전체 난중에 대한 난백의 비율은 54주령시를 제외한 나머지 모든 주령에서, 그리고 전체 평균 난백의 비율에서도 갈색란 계통은 백색란 계통보다 유의하게 (P<0.05) 더 높은 것으로 나타난 반면에, 난중에 대한 난황의 비율은 모든 시험주령 및 전체 평균치에 있어서 갈색란 계통이 백색란 계통보다 유의하게(P<0.05) 더 낮았다. 한편 난중에 대한 난각의 비율 및 난각의 두께는 갈색란 계통이 백색란 계통보다 유의하게(P<0.05) 더 높거나 더 두터운 것으로 나타났다. 전체 난중에 대한 난황 : 난백의 비율은4개 시험주령중 3개 시험주령에서 갈색란 계통이 백색란 계통보다 유의하게(P<0.05) 더 낮은 것으로 나타났다. 초산시(20주령)부터 56주령시까지의 전체 평균 Hen-day 산란율은 백색란 계통이 63.7%이었던 반면에, 갈색란 계통은 70.3%로서 갈색란 계통이 백색란 계통보다 6.6% 정도 산란율이 유의하게(P<0.05) 더 높았다. 결론적으로 계란소비자가 상대적으로 더 선호하는 갈색란 생산 계통을 사육하는 것이 성계의 체중과 가금티푸스와 같은 질병문제를 개량한다면 난중, 난백의 비율, 난각의 두께 및 산란율에 있어서 백색란 생산계통의 사육보다 더 바람직함을 알 수 있었다.

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