Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Influence of Corn Processing and Rumen Undegradable Protein Levels on Performance of Holstein Cows during the Transitional Period

옥수수 가공형태와 RUP 수준이 전환기 젖소의 생산성에 미치는 영향

  • Kim, H.S. (Dairy Cattle Division, National Livestock Research Institute, RDA) ;
  • Lee, J.S. (Department of Dairy Science, Chungnam National University) ;
  • Kim, Y.G. (Department of Dairy Science, Chungnam National University) ;
  • Lee, W.S. (Dairy Cattle Division, National Livestock Research Institute, RDA)
  • Published : 2005.12.31
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Abstract

This study examined the effect of corn processing with varying rumen undegradable protein (RUP) on feed intake, milk yield, its composition and, blood characteristics in Holstein cows during the transitional period (21 days pre partum to 21 days post partum). Twenty Holstein cows were randomly assigned to four diets (five cows/diet), ground corn with 30 % RUP (GCR30), ground corn with 40 % RUP (GCR40), flaked corn with 30 % RUP (FCR30), and flaked corn with 40 % RUP (FCR40). The processed corn with varying RUP was fed in total mixed rations (TMR) to cows. Dry matter intake (DMI) was higher with 40 % RUP diet than with 30 % RUP diet, resulting in higher protein and energy intake by cows during pre and post partum (p＜0.05). However, it was not affected by corn processing during pre and post partum. Similarly milk yield was higher with 40 % RUP diet than with 30 % RUP diet. and milk yield was affected by corn processing at RUP 30 % level. Corn processing did not affected the milk fat and protein contents in dairy cows. The concentration of blood non esterified fatty acid (NEFA) were effected by RUP level with flaked corn, however, it was non-significant with RUP levels when given with ground corn. It is concluded that increasing RUP from 30 % to 40 % in iso-nitrogenous diet could increase milk yield in dairy cows during the transitional phase.

본 연구는 젖소에서 곡류의 가공형태 및 RUP수준이 효과를 구명하기 위하여 분만 전 3주부터 분만 후 3주까지 전환기 Holstein종 경산우 20두(4처리 5반복)에게 TMR 사료를 GCR30 (파쇄옥수수+RUP 30%), GCR40 (파쇄옥수수+RUP40%), FCR30 (후레이크옥수수+RUP 30%), FCR40 (후레이크옥수수+RUP 40%)로 하여, 건유기와 비유기로 구분하여 배합하여 급여하였다. 본 연구로부터 얻어진 결과를 요약하면 다음과 같다. 분만전 사료의 건물 섭취량은 처리별로 평균 14～15kg이었으며, 건유기간 중 사료섭취량에는 유의한 차이가 없었으나, 분만 후 건물섭취량에서는 RUP 40%에서 섭취량이 RUP30%보다 높게 나타났다 (P＜0.05). 유량은 RUP 40 % 사료를 급여한 구 (FCR40과 GCR40)에서 유의하게 높은 결과를 보여주었다. 유단백질과 유지방을 분석한 결과, 유지방에 있어서는 옥수수 가공 형태인 후레이크와 파쇄처리에 따른 유의있는 결과를 보여주지는 않았다. 혈액 내 대사물질은 분만 전에 비하여 분만 당일의 수치가 모든 처리에서 상승하는 것을 볼 수 있었으며, 분만전ㆍ후의 NEFA의 농도를 보면 모든 처리구에서 분만을 기점으로 상승하였으며, 특히 분만 후에 유량이 높았던 FCR40에서 NEFA 수준이 전반적으로 높은 경향을 보였다 (p<0.05). Glucose와 cortisol 수준은 포도당 농도에서 FCR40구의 건유기가 다른 구보다 유의하게 높았으나 타 처리구간에서는 유의차가 인정되지 않았다. Insulin 농도에 있어서도 분만 전에 처리 간에 유의한 차이가 없으나, 분만 후에는 타처리와 비교하여 FCR40 처리에서 유의하게 높은 농도를 보여 주었다 (p<0.05). 이 시험에서는 옥수수의 가공형태보다는 동량의 단백질에 RUP 함량을 30 %에서 40 %로 증가시킴으로서 에너지, 단백질 이용 효율을 높여 젖소의 생산성을 높일 수 있을 것으로 생각된다.

Keywords

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