• KOREAN POULTRY JOURNAL
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• v.41 no.1
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• pp.182-185
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• 2009

채란업계에서는 산란계 닭을 단기간 혹은 장기간 절식시켜 강제적으로 환우를 유도하는 강제환우 기술이 널리 생산현장에서 실시되고 있다. 산란계의 유도환우는 산란계의 생산성과 난각질을 개선시킬 뿐만 아니라, 계란 생산 주기를 연장시켜 채란계산업의 이익을 증가시킨다. 일반적인 유도환우 방법은 일정기간 동안 사료 급여를 제한시켜 체중의 30%까지 감소시키는 방법이 주류를 이루고 있다. 이런 유도환우 방법은 (1) 육성경비의 절감 (2) 호우유니트의 개선 (3) 산란율의 개선 (4) 난각질의 개선과 이에 따르는 정상란 비율의 향상 등의 많은 장점을 가지고 있으나, (1) 과중한 스트레스에 의한 폐사의 증가 (2) 환우 후의 난중의 과대화 (3) 환우 중의 분변성상의 악화에 따른 작업환경 악화 등의 단점도 가지고 있다. 그러나 동물복지의 관점에서 닭의 사양환경이나 사육관리방법이 문제가 제기되고 있으며, 살모넬라 오염의 문제도 있어, 최근에는 새로운 유도환우법의 연구가 관심을 받고 있다.

• Korean Journal of Agricultural Science
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• v.33 no.1
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• pp.17-24
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• 2006

An experiment was conducted to investigate the effects of forced molting and egg storage time on the various egg qualities. A total of 240 ISA Brown layers (60 wk of age) were employed as the unmolted treatment (Control). Two hundred and forty ISA Brown layers, molted at the age of 55 wk, were used as a forced molting treatment (T1), and the same number and strain of layers, molted at the age of 70 wk, were also used as the another forced molting treatment (T2). A total of 120 eggs were sampled from each treatment, and divided into six sets, 20 eggs per set. These six sets were stored for 1, 3, 6, 9, 12, and 15 days at $18^{\circ}C$ temperature, respectively. Eggs from T1 were collected from laying hens at the age of 68 wk, which started molting at 60 wk of age and achieved 50% egg production at 63 wk of age. Eggs from T2 were collected from hens at 82 wk of age, which started molting at 70 wk of age and achieved 50% egg production at 78 wk of age. The eggshell strength of T1 was significantly (p<0.05) higher than the Control and T2, and the storing periods did not affect the eggshell strength at all. Neither the forced molting nor the storing periods did not exert any consistent effect on the egg weight, eggshell thickness, eggshell color and egg yolk color. The albumin heights of T1 and T2 were significantly (p<0.05) lower than the Control, and it was remarkably reduced gradually as the storage periods increased in all three treatments. The Haugh unit showed very similar trends as the albumin height, indicating that both albumin height and Haugh unit were very much related to each other. In conclusion, the forced molting improves the eggshell strength, but decreases the albumin height and Haugh unit. The storage of eggs also decreases the albumin height and Haugh unit regardless of molting.

• KOREAN POULTRY JOURNAL
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• v.10 no.8 s.106
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• pp.111-117
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• 1978

양계업이 하나의 기업인 한 추구하는 궁극적 목표는 수익에 있다. 새로운 품종, 새로운 시설, 그리고 사양관리에 관한 새로운 기법 등 양계업에 있어서 새로운 모든 것은 수익이 전제되어야 그 가치가 있는 것이다. 강제환우도 예상되는 사항에 대한 주의깊은 검토가 있은 후에 선택되어야 하는 것으로 수익을 보다 높일 수 있는 방법으로써 활용되어야 한다.

• Korean Journal of Poultry Science
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• v.29 no.4
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• pp.243-247
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• 2002

A study was conducted to investigate the effect of induced molting on the relative weight and hormone levels of thyroid, ovary, and adrenal glands in spent laying hens. Three hundred sixty 77-wk-old, Babcock White hens were divided into 36 experimental units of 10 hens each and induced to molt for seven weeks. A diet containing 16% CP and 2,800 kcal ME/kg was fed ad libitum from 84 to 126 weeks of age. Thirty-six birds were randomly selected for blood collection and slaughtered at Pre-molt, 5% egg Production, Peak, and end Phase of the egg Production. Weights of the thyroid, ovary, adrenal glands, and plasma T3, T4, cortisol, and estradiol contents were measured at each stage. Weight of the thyroid reached its highest level at 5% e99 Production stage. The ovary weight was greatly reduced during molting, but started to increase after induced molting until the end of the egg Production Phase (P<0.05). Plasma T3,T4 and cortisol were found to be the highest at the start of the Post-molt Production stage, but reached their minimum at the end Phase of e99 Production. Plasma estradiol was the lowest at the 5% egg Production stage. The Present study demonstrated that molting is a complex Process that require the involvement of endocrine glands to trigger their specific hormones, which play a key role in molt induction.

• KOREAN POULTRY JOURNAL
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• v.14 s.158
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• pp.64-65
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• 1982

• KOREAN POULTRY JOURNAL
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• s.103
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• pp.48-54
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• 1978

• KOREAN POULTRY JOURNAL
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• v.30 no.7 s.345
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• pp.144-145
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• 1998

• KOREAN POULTRY JOURNAL
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• v.7 no.6 s.68
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• pp.36-39
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• 1975

• KOREAN POULTRY JOURNAL
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• s.96
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• pp.89-93
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• 1977

• KOREAN POULTRY JOURNAL
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• v.10 no.6 s.104
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• pp.123-128
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• 1978