Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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A Study on Estimation of Factors Affecting Duration of Milk Flow and Milk Flow Rate and Their Relationships with Milk Yields of Dairy Cattle

유우의 착유 지속시간과 유속에 미치는 요인 및 산유량과의 상관관계 추정에 관한 연구

  • Cho, Y.M. (National Livestock Research Institute, RDA.) ;
  • Park, B.H. (National Livestock Research Institute, RDA.) ;
  • Ahn, B.S. (National Livestock Research Institute, RDA.)
  • Published : 2004.08.31
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Abstract

The objective of this study was to investigate the environmental effects on duration time of milk flow, peak milk flow, and average milk flow in teats, and to estimate their relationships with milk yields in morning and evening milking, and to provide fimdamental information for the further study on their relationships with clinical mastitis and somatic cell in milk. A total of 6,768 milking records were studied in 72 Holstein cows. The influences of season, parity, lactation month, and milking interval on characteristics of milk flow considering in linear model were significant(p<.05). Duration of milk flow was longest at milking in fall, past first parity and second month of lactation, and with milking interval over than 13.5hrs. Average milk flow rate and peak milk flow rate were highest at milking in summer, past first parity and 8${\sim}$10 months of lactation, and with milking interval over than 13.5hrs. Milk flow rate was positively correlated to milk yield, and negatively correlated to the duration of milk flow. However duration milk flow was positively correlated to the milk yield with high level of correlation coefficient(+.60). For the establishment of optimum selection criteria on these traits, other aspects such as the udder health, disease and respective economic weights of milk flow characteristics in this study must be considered to develop the indices.

본 연구는 유우의 착유 지속시간, 평균 유속 및 최대 유속에 영향하는 환경 요인을 추정하고 이들 형질들과 산유량간의 관련성을 규명하여 진공압에 의한 착유기를 이용한 여건에서 비유 특성에 대해 알아보고 또한 향후 진행될 수 있는 착유우의 유방관련 질병과의 관계에 대한 연구 기초자료를 제공하고자 실시하였다. 조사된 착유 지속 시간 및 유속에 대해 분석 모형에 고려한 분만계절, 산차, 비유 월수 및 착유 시간 간격의 환경 요인들이 대부분 유의적인 효과를 가지는 것으로 추정되었다. 착유 유량과 착유 지속 시간 및 유속간의 상관관계 조사를 통해 유속이 빠를수록 유량이 많아지고, 착유 지속 시간과 유속간의 부의 상관관계가 존재하여, 착유 시간에 대한 경제적 가치를 고려한 투입비용의 절감을 위해 착유시간이 짧은 착유우가 바람직하면서 동시에 착유 유속이 빠르고 착유 유량이 많아질 것으로 기대할 수 있으나, 착유 유속과 유성분내의 체세포 수 및 유방염의 발생 빈도에 대한 기존의 보고들을 고려할 때 질병 발생에 따른 치료비용 및 유질의 저하로 인한 손실을 주의해야 하며, 착유 유량과 착유 지속 시간간의 높은 상관으로 인해 형질간 상관 반응에 대하 해석에 주의가 필요한 것으로 생각되므로 본 연구에서 조사한 착유 유량, 착유 유속 및 착유 지속 시간 뿐만 아니라 체세포 수와 유방염 자료 조사를 통해 다각적인 경제 가중치가 고려된 종합적인 지수식으로 해석하는 것이 적절하며 이에 대한 추가적인 연구가 필요할 것으로 생각된다.

Keywords

References

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