Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effects of Age of Hens, Egg Storage, and the Change of Egg Weight during Incubation on the Growth of Broiler Chicks

어미닭의 나이, 계란의 저장기간 및 부화중 난중의 변화가 육용계 병아리의 성장에 미치는 효과

  • Suk Y. O. (Department of Applied Animal Science, Division of Life Resources, Sahmyook University)
  • 석윤오 (삼육대학교 생명자원과학부 응용동물학과)
  • Published : 2004.12.01
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Abstract

The objective of this study was to investigate the influence of egg storage, broiler breeder age, and the change of egg weight during incubation on growth rate of chicks and 43-day-old dressing percentage. The trials involved hatching eggs obtained from 27-wk-old hens and stored for 6 d for the Young-EXP group, from 28-wk-old hens and stored for 0 d for the Young-CON group, from 51-wk-old hens and stored for 6 d for the Old-EXP group, and from 52-wk-old hens and stored for 0 d for the Old-CON group, The hens were two commercial broiler breeder flocks of the same strain (Cobb) but of different egg producing stages(early and middle stages of egg production). The chicks were grown on floor pens for 6 wks, The differences of setting egg weights between Old-CON and Old-EXP groups were 1 g, but those between Young-CON and Young-EXP groups were 2.9 g(P<0,05). The loss of egg weight during 18 d incubation did not greatly differ among four groups, but the loss of egg weight during 21 d incubation was significantly (P<0.05) more in the middle stage of egg production groups than in the early stage of egg production groups. The mean birth weights of the middle stage of egg production groups were significantly(P<0,05) heavier by 8,7 g than those of the early stage of egg production groups; however, the differences of 6-wk-old body weight were not significant between egg producing stages. The differences of body weights in both egg producing stages were not significantly influenced by egg storage period in overall wks of ages. Egg storage and hen age did not greatly influence to the 43 d dressing percentages, either, The correlations of the setting egg weight with 18 d egg weight during incubation, growth rate of chicks, or 43 d dressing percentage were not significant.

본 연구는 어미닭의 나이, 계란의 저장기간 및 부화중 난중의 변화가 병아리의 성장률에 미치는 영향을 조사하기 위하여 육용종계 Cobb종으로부터 산란초기 계군($27\~28$주령)과 산란중기 계군($51\~52$ 주령)으로부터 종란을 수집하여 $10^{\circ}C$에서 6일간 계란을 저장(Young-EXP 혹은 Old-EXP 그룹)하거나, 부화기 입란 당일에 수거(Young-CON혹은 014-CON그룹)하여 부화시킨 4-그룹의 병아리(female 11수 + male 12수/그룹)를 6주 동안 평사에서 사육하였다. 산란중기 두 그룹(old-CON, old-EXP)상호간 입란시 난중의 차이는 1 g정도였는데 비해서, 산란초기 두 그룹(Young-CON, Young-EXP) 상호간 입란시 난중의 차이는 2.9 g정도(P<0.05)로 산란중기보다 산란초기에 일령의 증가에 따라 난중의 변화폭이 더 큰 것으로 나타났다. 입란시 난중에 대한 부화 18일경 난중의 감소 비율($\%$)은 그룹간에 별 차이가 없었으나, 전체 부화기간(21일간)의 난중 감소 비율($\%$)은 산란초기 그룹들보다 산란중기 그룹들이 유의하게(P<0.05) 더 컸다. 산란중기 계군들은 산란초기 계군들보다 부화시 체중이 평균 8.7g정도 유의하게(P<0.05) 더 무거웠으나, 시험종료시인 6주령시 체중은 4-그룹 상호간에 유의한 차이는 없었고, 대부분 모든 주령의 체중에 있어서 계란의 저장기간 상호간에도 두 계군 모두 통계적인 유의한 차이는 없었다. 도체율에 있어서도 계란의 저장기간 또는 어미자의 나이 상호간에 별 차이가 없었으며, 입란시 난중과 부화 18일경 난중, 부화 후 성장률 및 43일령시 도체율 상호간에 유의한 상관관계는 나타나지 않았다.

Keywords

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