Journal of The Korean Society of Grassland and Forage Science (한국초지조사료학회지)

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Effects of Dietary Herbaceous Peat on In Vitro Fermentation and Milk Production in Dairy Cows

허브부식토의 사료내 첨가에 따른 In Vitro 발효특성과 젖소의 유생산성에 미치는 영향

  • Kim, Hyeon-Shup (National Institute of Animal Science, RDA) ;
  • Park, Joong-Kook (National Institute of Animal Science, RDA) ;
  • Kim, Hong-Yun (School of Animal Life and Environment Science, Hankyong National University) ;
  • Kim, Sang-Bum (National Institute of Animal Science, RDA) ;
  • Yang, Seung-Hak (National Institute of Animal Science, RDA) ;
  • Kim, Chang-Hyun (School of Animal Life and Environment Science, Hankyong National University) ;
  • Ahn, Jong-Ho (School of Animal Life and Environment Science, Hankyong National University)
  • 김현섭 (농촌진흥청 국립축산과학원) ;
  • 박중국 (농촌진흥청 국립축산과학원) ;
  • 김홍윤 (한경대학교 동물생명환경과학부) ;
  • 김상범 (농촌진흥청 국립축산과학원) ;
  • 양승학 (농촌진흥청 국립축산과학원) ;
  • 김창현 (한경대학교 동물생명환경과학부) ;
  • 안종호 (한경대학교 동물생명환경과학부)
  • Received : 2011.03.07
  • Accepted : 2011.04.21
  • Published : 2011.06.30
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Abstract

This study was conducted to determine effects of dietary herbaceous peat on in vitro fermentation and milk production in dairy cows. Ruminal pH, gas production, VFA (volatile fatty acid), Ammonia-N, and rumen degradability were examined by the addition of three times over 0, 1, and 5% herbaceous peat with substrate of timothy hay, and the change of rumen fermentation characteristics were evaluated. In 0, 3, 12 and 24 hours cultivation, all treatments did not show a significant difference but the control at 6 hours appeared significantly lower pH compared to 1 and 5% treatments (p<0.05). The gas production of the treatments significantly increased until 12 hours of cultivation compared to control (p<0.05), the rumen ammonia concentration showed a tendency to increase until 24 hours in all treatment groups, and there was no significant difference between treatments. About the rumen degradability, 5% treatment showed higher rumen degradability in all hours than control and 1% treatment (p<0.05). Meanwhile, for in vivo trial, 16 heads of Holstein lactation dairy cows were selected for experiment for four weeks in order to research the change of milk yield, milk compositions and change of somatic cell counts of lactation dairy cows by herbaceous peat feeding. The milk yield of vitamin C and herbaceous peat treatments (T3) was 25.0 kg but the control was 23.2 kg, herbaceous peat treatment (T1) was 23.1 kg, and vitamin C treatment (T2) was 23.4 kg, so there was linear increase effect of milk yield by T3. The partial significance of the milk (fat, milk protein, lactose, MUN and SNF) and change of somatic cell count before and after experiment by the control and treatments about change of milk and somatic cell counts (p<0.05) were recognized. About change of milk in the first half (1~2 weeks) and latter half (3~4 weeks) during four weeks of experiments period, the herbaceous peat supplement treatments showed a tendency of significant decrease of quality of milk protein and SNF. The control and treatments did not show significant change of blood nutrients (total protein, cholesterol, NEFA, BUN), liver function component (AST, GGT) and minerals (Ca, P, Mg) before and after experiment. In summary, it is judged that herbaceous peat feeding for lactation dairy cows would be recommendable based on the results of milk, somatic cell count physiologically.

본 연구는 허브 부식토를 이용하여 첨가 수준별 in vitro 반추위 발효특성 평가와 젖소를 이용하여 급여시 유생산성에 미치는 영향을 조사하기 위하여 본 연구를 수행하였다. 시험 1에서는 티머시 건초를 기질로 하여 허브부식토(herbaceous peat)를 0,1 및 5%를 3반복으로 각각 첨가하여 in vitro 반추위내 pH, 가스발생량, VFA (volatile fatty acid), ammonia-N 및 건물분해율을 조사하여 반추위내 발효성상의 변화를 평가하였다. pH 변화는 0, 3, 12 및 24시간 배양에 있어서 모든 처리구에서 유의한 차이를 보이지 않았지만 6시간. 대조구에서 1 및 5% 첨가구와 비교하여 유의하게 낮은 pH를 나타냈다(p<0.05).가스 발생량은 배양 12시간까지 처리구에서 대조구와 비교하여 유의하게 증가 하였으며(p<0.05), 반추위액내 암모니아 농도는 모든 처리구에서 24시간까지 증가하는 경향을 나타냈으며, 처리간 유의한 차이는 없었다. 건물분해율은 모든 시간에서 5%구가 대조구 및 1%구와 비교하여 건물분해율이 높았다(p< 0.05) 따라서 허브부식토를 0, 1 및 5% 수준으로 각각 첨가하여 반추위내 in vitro 배양시간 별 반추위 발효특성은 대부분 조사항목에서 처리구가 대조구에 비해 개선효과를 나타냈으며, 시험 2에서는 젖소를 이용하여 사양시험을 통해 유생산성을 평가하였으며, 우유생산량 변화와 유성분 및 체세포 수 변화를 조사하기 위해 홀스타인 착유우 16두를 공시하여 4주간 사양 시험을 실시하였다. 산유량은 T3구가 25.0 kg으로 대조구(23.2 kg), 부식토 처리구(23.1 kg), 비타민 C 처리구(23.4 kg)와 비슷하여 수치적으로 증가하였다. 대조구와 처리구별 시험 시작 전 유성분(유지방, 유단백, 유당, MUN 및 SNF) 및 체세포 수의 변화는 일부 유의성이 인정되었다(p<0.05). 4주간의 시험 기간 중 전반기(1~2주)와 후반기(3~4주)의 유성분 변화를 보면 부식토 첨가구에 있어서 유단백질과 SNF가 유의적으로 증가하는 경향을 나타내었다. 대조구와 처리구의 시험 시작 전 의 혈액내 영양성분 (총단백질, 콜레스테롤, NEFA, BUN), 간기능 성분(AST, GGT) 및 무기물(Ca, P, Mg)에서 뚜렷한 변화를 나타내지 않았다. 이상의 결과를 종합해 볼 때 착유우에 부식토를 급여하는 것이 유성분, 체세포 수 및 생리적으로 긍정적인 영향을 줄 것으로 판단된다.

Keywords

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