Effect of Feeding Split Diets for a.m. and p.m. on Egg Shell Quality

산란계에 대한 오전용 사료와 오후용 사료의 별도 급여가 난각질에 미치는 영향

  • 이규호 (강원대학교 사료생산공학과) ;
  • 정연종 (강원대학교 사료생산공학과)
  • Published : 1996.03.01

Abstract

An experiment was conducted to investigate the effect of feeding split diets for a.m. and p.m. in laying hens on egg shell qualities, and to study the relationship among the methods of measuring shell quality with 480 ISA Brown layers during 32∼36, 52∼56 and 72∼76 wk of age, respectively. A total of 1,080 eggs were collected from 6 treatment groups in every laying period and weighed individually. Egg specific gravity, egg breaking strength, shell thickness and shell percentage of eggs were measured, and then correlation coefficients (r) and regression equations were calculated. By feeding the split diets for a.m. and p.m. differing in ME, CP, and Ca levels, and as the Ca level of the p. m. diet increased, eggshell qualities were improved(P<0.05). The correlation coefficient values indicate that shell percentage, shell thickness and egg specific gravity are highly correlated with the egg breaking strength(P<0.01).

산란계에 대한 오전사료와 오후사료의 별도 급여가 계란의 난각질에 미치는 영향을 조사하고, 난각질 조사항목 상호간의 관계를 조사하기 위해 ISA Brown 갈색산란계 480수를 공시하여 32~36주령과 52~56주령 및 72~76주령에 각각 4주간 사양시험을 실시하였다. 각 산란기별로 처리당 60개씩 모두 1,080개의 계란을 수집하여 난각질을 조사하고 난각질 조사항목 상호간의 관계를 연구한 결과는 다음과 같다. 1. 계란의 비중, 난각 강도, 난각 후도 및 난각 비율등은 모두 오전사료 와 오후사료를 별도급여한 시험구들(T$_1$-T$_{5}$)이 대조구(C)에 비해 향상되었으며(P<0.05), 오후사료의 Ca 수준이 증가할수록 향상되는 경향이었다(P<0.05). 2. 난각질 조사항목간의 상관계수(r)는 0.79~0.90 으로 모두 고도의 유의적인 상관관계가 있었다(P<0.01). 3. 난각질 조사방법간의 관계를 조사하기 위해 단순회귀방정식과 다중회귀방정식을 구하였다.

Keywords

References

  1. MSc. Thesis, Univ. Guelph A study of the hens nutrient intake as it relates to egg formation Chan,C.C.
  2. Biometrics v.11 Multiple range and multiple F tests Duncan,D.B.
  3. Poultry Sci v.60 The influence of time of dietary calcium intake on shell quality Lennards,R.M.;Roland,D.A. Sr.
  4. Poultry Sci v.52 Calcium metabolism in the laying hen. 4. The calcium status of the hen at night Roland,D.A. Sr;Solan,D.R.;Harms,R.H.
  5. 1992 SAS User's Guide : Statistics(Ver 5 ed) SAS Institute
  6. Poultry Sci v.50 The calcium requirement of laying hens and effect of dietary oyster shell upon egg shell quallity Scott,M.L.;Hull,S.J.;Mullenhoff,P.A.
  7. Biol Rev v.36 Calcium metabolism and avain reproduction Simkiss,K.
  8. Scientific Amer v.222 How an eggshell is made Taylor,T.G.
  9. Poultry Sci v.54 The effect of cropectomy on skeletal reproductive and physiological characteristics of laying hen Stonerock,R.H.;Ronald,D.A. Sr;Voitle,R.A.
  10. Poultry Sci v.53 A rapid and effective technique for cropectomy in mature or nearly mature chickens Voitle,R.A.;Roland,D.A. Sr;Harms,R.H.
  11. 한국가금학회지 v.21 난용계 산란기의 선택채식에 관한 연구 이규호;이덕수