Studies on the Effects of Economic Traits on the Frequency of Soft and Broken Eggs in Laying Hens 1. Correlation between Economic Traits on the Frequency of Soft and Broken Eggs in Colored Laying Hens

산란계의 경제형질과 연파란 발생비율에 관한 연구 1. 유색산란계 연파란율과 다른 형질과의 상관

  • Published : 1992.12.01

Abstract

This study was carried out to investigate the relationship between frequency of soft and broken eggs and the economic traits for colored laying hens using the data sampled 7 times in Korea from 1985 to 1991. In addition, the correlation coefficients of frequency of soft and broken eggs on the economic traits for colored laying hens in order to decrease the frequency of soft and broken eggs were studied. The results obtained were summarized as follows : 1. For colored laying hens, mean of the sexual maturity(SM) was 163.6 days, hen-day egg Production(HDEP) was 79.49%, hen-housed egg Production(HHEP) was 272.9 eggs, egg weight (EW) was 62.69g and the frequency of soft and broken eggs was 1.363% during 18∼72wks. For white laying hens, SM was 157.2 days, HDEP was 77.87%, HHEP was 265.1 eggs, EW was 60. 26g and the frequency of soft and broken eggs (FSBE) was 1.174% during 18∼72wks. 2. Statistical significances were observed in laying viability, SM, HDEP, FR, BW and FSBE during 18 ∼72wks and 18 ∼78wks by year for colored laying hens. 3. Sexual maturity was shortened from 168.5 days to 155.9 days. FSBE decreased from 1.4∼l.69% to 0.94∼o.89% during 18∼72wks, and HDEP was increased from 74.5∼75.1% to 77.8∼80.6%, HHEP was increased to 302.0∼304.6 eggs and FSBE was increased from 1.54∼2.02% to 0.98% during 18∼78wks in colored laying hens. 4. Estimate of correlation coefficients between FSBE and trait of SM, EW, 72 wks BW were 0.3985, 0.1072, 0.4225, and those of HDEP, HHEP, FR were -0.5662, -2896, -0.245 during 18∼72wks In colored laying hens, respectively. 5. Estimate of correlation coefficients between FSBE and traits of SM, EW, 78wks BW were 0.3791, 0.1171, 0.4609, and those of HDEP, HHEP, FR were -0.5041, -0.2372, -0.2421 during 18∼78wks in colored laying hens, respectively.

본 연구는 대한양계협회에서 1985년부터 1991년까지 7회에 걸쳐 실시한 산난계 경제능력 검정성적을 기초로 하여 유색산난계의 연파난 발생비율과 다른 형질간의 년차별 평균능력의 변화와 연파난 발생비율이 다른 형질들에 의해 변화되는 정도를 추정하여 상관계수를 구하여 산난계의 연파난 발생비율을 감소시킬 수 있는 산란계 개량 방향과 사양관리조건 개선에 대한 기초 자료를 제시하기 위하여 실시한 것으로 그 결과를 요약하면 다음과 같다. 1. 유색산난계의 18∼72주령 초산일령은 163.6일, 산난율은 79.49%, 산난지수는 272.9개, 난중은 62.69g이었으며, 연파난 발생비율은 1.141%이었고 백색산난계는 18∼72주령에 각 형질의 평균능력이 각각 157.2일, 77.87%, 265.1개, 60.26g이었으며 연파난 발생비율은 1.174%이었다. 2. 유색산난계의 18∼72주령과 18∼78주령에 조사된 각 형질의 능력에 대한 유의성 검정결과 생존율, 초산일령, 산난율, 사료요구율, 체중 및 연파난 발생비율은 고도의 통계적 유의성(P<0.01)이 인정되었다. 3. 유색산난계의 '85∼'91년 기간중 18∼72주령에는 초산일령은 168.5일에서 155.9일로 단축되었고 연파난 발생비율은 1.4∼l.69%에서 0.89∼0.94%로 감소하였으며, 18∼78주령에는 산난율은 74.5∼75.1%에서 77.8∼80.6%로 증가하였고, 산난지수는 302.0∼304.6개로 증가하였고, 연파난율은 1.54∼2.02%에서 0.98% 내외로 감소하는 경향을 나타냈다. 4. 유색산난계에 대한 각 형질의 능력에 따른 21∼72주령의 연파난 발생비율과의 상관계수는 초산일령 0.3985, 난중 0.1072, 72주령 체중은 0.4225로 정의 상관을 나타냈으며, 산난율은 -0.5662, 산난지수는 -0.2896, 그리고 사료요구율과는 -0.245로 부의 상관을 나타냈다. 5. 유색산난계의 21∼78주령 각 형질의 능력에 따른 연파난 발생비율과의 상관계수는 초산 일령 0.3971, 난중 0.1171 그리고 78주령 체중은 0.4609의 정의 상관을 나타냈고, 산난율은 -0.5041, 산난지수는 -0.2372 그리고 사료요구율은 -0.2421로 부의 상관을 나타냈다.

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