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Physicochemical Properties of Colostrum by Milking Time of Gyeonggi Province

경기지역의 착유회수에 따른 초유의 이화학적 특성

  • 정석근 (농촌진흥청 국립축산과학원) ;
  • 함준상 (농촌진흥청 국립축산과학원) ;
  • 김동훈 (농촌진흥청 국립축산과학원) ;
  • 안종남 (농촌진흥청 국립축산과학원) ;
  • 채현석 (농촌진흥청 국립축산과학원) ;
  • 유영모 (농촌진흥청 국립축산과학원) ;
  • 장애라 (농촌진흥청 국립축산과학원) ;
  • 권일경 (강원대학교) ;
  • 이승규 (농촌진흥청 국립축산과학원)
  • Published : 2009.08.31

Abstract

Colostrum samples were collected from 36 dairy farms in Gyeonggi-do and one dairy farm in the National Institute of Animal Science (NIAS) for testing. Colostrum samples were analyzed for phisycochemicals (specific gravity, pH, titratable acidity), general components (fat, protein, lactose, total solid, solid non-fat (SNF)), fatty acids, amino acids, minerals, microflora, somatic cells, and Ig (Immunoglobulin). The first colostrum revealed the following data: fat contents were $6.16{\pm}2.39%$, proteins were $14.78{\pm}4.30%$, lactose $2.57{\pm}0.77%$, total solid $24.28{\pm}4.36%$, and SNF $18.12{\pm}4.08%$, whereas the 2nd (or $12^{th}$) colostrum revealed $5.56{\pm}1.76%$ fat, $3.46{\pm}0.41%$ proteins, $4.19{\pm}0.43%$ lactose, $13.90{\pm}1.76%$ total solid, and $8.34{\pm}0.81%$ SNF. Also, the first colostrum revealed the contents of major amino acids as 0.89% aspartic acid, 0.71% threonine, 0.86% serine, 1.75% glutamic acid, 0.64% valine, 0.95% leucine, 0.83% lysine, and 0.95% proline, and those in the 10th colostrum were 0.25% aspartic acid, 0.15% threonine, 0.19% serine, 0.59% glutamic acid, 0.19% valine, 0.35% leucine, 0.31% lysine, and 0.34% proine. Major amino acid contents rapidly decreased as milking times increased. In the first colostrum, the following mineral contents were observed: there were 2,168 ppm in Ca, 1,959 ppm in P, 914 ppm in K, 761 ppm in Na, 287 ppm in Mg, 1.7 ppm in Fe, 14.3 ppm in Zn, and 1.0 ppm in Cu; while in the 10th colostrum, the following ppm contents were 1,389 in Ca, 1,323 in P, 838 in K, 427 in Na, 131 in Mg, 1.0 in Fe, 4.7 in Zn, and 1.3 in Cu. The mineral contents in a colostrum rapidly decreased as milking times increased.

국내산 젖소 초유의 산차별, 착유 횟수별 성분특성을 구명하고 농가에서 이용 가능한 초유의 적정이용방법을 모색하여 잉여 초유의 저장성 향상 및 자원의 활용성을 높이고자 초유의 특성을 분석한 결과를 요약하면 다음과 같다. 초유의 유성분에 영향을 미치는 요인은 산차, 착유횟수, pH, 적정산도, 비중 등으로 확인되었다. 산차별 유성분의 변화를 보면 유지방은 산차에 따른 변화는 없었으며, 유단백질과 무지고형분은 산차가 높을수록 증가하였다. 분만 후 첫 회 착유한 초유의 유성분 중 유지방, 유단백질, 유당, 총고형분, 무지고형분은 각각 $6.16{\pm}2.39$, $14.78{\pm}4.30$, $2.57{\pm}0.77$, $24.28{\pm}4.36$, $18.12{\pm}4.08%$이었으며, 초유의 품질은 1-4회 착유분이 초유의 특성을 가지고 있었다. 초유의 착유횟수에 따른 체세포수는 분만 후 첫 회에는 $6.39{\pm}0.46$ log10 cell/mL 수준으로 매우 높게 나타나, 초유 납유시 체세포수를 고려한 품질관리에 관심을 가져야 할 것으로 나타났다. 분만 후 첫 회 착유한 초유의 aspartic acid, threonine, serine, glutamic acid, valine, leucine, lysine, 및 proline 등 주요 아미노산 함량은 각각 0.89, 0.71, 0.86, 1.75, 0.64, 0.95, 0.83, 및 0.95%이었고 착유횟수가 증가할수록 감소 하였다. 첫 회 착유한 초유의 myristic acid, palmitic acid, stearic acid, 및 oleic acid같은 주요 지방산 함량은 각각 총지방산의 14.3, 47.7, 7.41, 및 25.9%이었고, myristic acid, palmitic acid는 착유 횟수가 늘어남에 따라 증가하였으나 stearic acid와 oleic acid는 감소하였다. 첫 회 착유한 초유의 Ca, P, K, Na, Mg, Fe, Zn, 및 Cu함량은 각각 2,168, 1,959, 914, 761, 287, 1.7, 14.3, and 1.0 ppm이었고, 108시간 후 착유시에는 각각 1,389, 1,323, 838, 427, 131, 1.0, 4.7, 및 1.3 ppm으로 감소하였으며, Mn은 검출되지 않았다. 초유의 총 미생물수가 $3.0{\times}10^6$, 대장균군이 $1.4{\times}10^3$, 효 모곰팡이가 $1.6{\times}10^2$ CFU/mL이었다.

Keywords

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