Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Dietary Effects of Varying Levels of Calcium and 25-hydroxycholecalciferol on Hatching Egg Production and Eggshell Quality in Aged Egg-Type Breeder Hens

칼슘의 수준별 급여 및 25-hydroxycholecalciferol의 사료 내 첨가가 종란 생산성 및 후기 난각질에 미치는 영향

  • Kim, Eun-Jib (Division of Animal Care, Cheonan Yonam College) ;
  • Ahn, Byoung-Ki (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University) ;
  • Kang, Chang-Won (Animal Resources Research Center, College of Animal Bioscience and Technology, Konkuk University)
  • 김은집 (천안연암대 동물보호계열) ;
  • 안병기 (건국대학교 동물생명과학대학 동물자원연구센터) ;
  • 강창원 (건국대학교 동물생명과학대학 동물자원연구센터)
  • Received : 2009.02.20
  • Accepted : 2009.08.18
  • Published : 2009.08.01
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Abstract

This experiment was conducted to investigate the effects of dietary calcium (Ca) and vitamin $D_3$ metabolite on eggshell quality and hatching egg production in aged egg-type breeder hens. A total of five hundred and forty 60-week-old Hy-Line Brown breeder hens were randomly allocated to nine treatments in a $3\times3$ factorial design to determine the effects of dietary Ca levels (3.3, 3.9, and 4.5%), combined with three levels of 25-hydroxycholecalciferol [25-$(OH)D_3$ 0, 75, and $150{\mu}g/kg$], on eggshell quality and egg production for 10 weeks. There were significant Ca and 25-$(OH)D_3$ effects (P<0.01) on egg production rate. There was a linear (P<0.01) increase in eggshell strength and thickness with increasing dietary Ca and 25-$(OH)D_3$ levels. Dietary 25-$(OH)D_3$ had a significant effect (P<0.05) on hatchability of egg although fertility was not influenced by dietarylevels of Ca and 25-$(OH)D_3$. Dietary Ca levels affected Ca content in tibia (P<0.05). These results indicated that relatively high levels of dietary Ca in combination with 25-$(OH)D_3$ had a beneficial effect on improving eggshell quality and reproductive performance in aged egg-type breeder hens.

본 실험에서는 사료 내 Ca 공급 수준의 증가 및 25-$(OH)D_3$의 첨가 급여가 산란종계에서 후기 난각질 강화 및 종란 생산성에 미치는 영향을 검토하기 위한 목적으로 수행하였다. 60주령 Hy-Line Brown 산란종계 암탉 540수와 수탉 54수를 공시하여 사료 내 Ca을 3.3%, 3.9% 및 4.5% 로 하고, 25-$(OH)D_3$를 각각 0, 75 및 $150{\mu}g/kg$ 수준으로 첨가한 총 9개 실험사료를 10주간 급여하였다. 주별로 사료섭취량을 조사하였고, 산란율과 난중은 매일 조사하였다. 종란율과 부화율 조사를 위해 생산된 종란을 주별로 처리하였다. 실험사료 급여 후 주별로 생산된 계란을 반복구별로 10개씩 수집하여 난각질 측정에 이용하였다. 실험 종료 시 반복구별로 평균체중이 비슷한 개체를 선발하여 채혈 후 희생시킨 다음 경골을 적출하였다. 채취한 경골은 화학적 조성의 분석을 위한 시료로 이용하였고, 얻어진 혈액에서도 성분 분석을 실시하였다. 산란율은 Ca 3.9% 첨가구가 Ca 3.3%와 Ca 4.5% 첨가구에 비해 유의한 증가가 나타났으며(P<0.01), 25-$(OH)D_3$의 무첨가구에서 25-$(OH)D_3$ 첨가구에 비해 유의하게(P<0.01) 높게 나타났다. 난각강도는 Ca 4.5% 첨가구가 Ca 3.9%와 Ca 3.3% 첨가구에 비해 유의하게 개선되었으며(P<0.01), 25-$(OH)D_3$ $150{\mu}g/kg$ 첨가구에서 25-$(OH)D_3$ $70{\mu}g/kg$ 첨가구와 25-$(OH)D_3$ 무첨가구에 비해 유의하게 개선되었다(P<0.01). 수정율은 Ca 급여수준 변화 및 25-$(OH)D_3$의 첨가 급여에 따라 처리구간에 큰 차이는 없는 것으로 나타났으나, 입란대 부화율은 25-$(OH)D_3$ $150{\mu}g/kg$ 첨가구에서 25-$(OH)D_3$ 무첨가구에 비해 유의하게(P<0.05) 높게 인정되었다. 경골내 Ca 함량은 Ca 4.5% 급여구에서 Ca 3.3% 급여구 및 Ca 3.9% 급여구에 비해 유의한 차이가 나타났으나(P<0.05), 25-$(OH)D_3$의 첨가 효과는 인정되지 않았다. 상기의 결과로부터 산란종계의 후기 난각질 개선을 위해서는 사료 내의 Ca 수준을 비교적 높게 설정하는 것이 유리하며, 25-$(OH)D_3$의 첨가에 의해서도 난각질이 개선될 수 있는 것으로 나타났다. 또한 25-$(OH)D_3$를 $150{\mu}g/kg$ 첨가에 의해 입란대 부화율이 유의하게 개선되는 결과가 시사되었다. 그러나 25-$(OH)D_3$를 $150{\mu}g/kg$ 수준으로 첨가했을 때 관찰된 산란율의 저하에 대해서는 그 원인을 밝히기 위한 추가적인 연구가 필요하겠다.

Keywords

References

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