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KMID : 1025520090510040265
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Journal of Animal Science and Technology
2009 Volume.51 No. 4 p.265 ~ p.272
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Analysis of Daily Milking Flow in Holstein Dairy Cow Using the LactoCorder
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Cho Kwang-Hyun
Choi Jun-Pyo
You Byung-Wha
Lee Deuk-Hwan
Kong Hong-Sik
Park Keong-Do
Lee Hak-Kyo
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Abstract
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A total of 486 milk records were collected from 16 diary farms in Imsil-gun, Jeollabuk-do. Results obtained were as follows: The average 3MG(amount of milk within the first three minute) was 7.44kg and 55% of total milk yield was produced within 3 min. The average of SPL(% of foam in milk) was 33.93% and the average of MNG(strip yield) was 0.14kg, which was less than 1% of total milk yield. The averages of HMF(highest milk flow), HMG(maximum milk flow rate in one minute) and DMHG(average milk flow in the main milking phase) were 3.03kg/min, 2.94kg/min and 2.05kg/min, respectively and the average milking speed in Imsil-gun was slower than other regions. The average of tS500(time to reach 0.5kg/min at beginning) was 0.23min(about 14 seconds) and that of tMGG(duration of the total milking) was 7.75min. The average tMBG(duration of the dry milking phase) was 0.58min(35 seconds) and that of tMNG(duration of the stripping phase) was 0.42min(14 seconds). The averages of ELHMF(electrical conductivity at highest milk flow) and ELAP(beginning peak level of the electrical conductivity) were 6.81mS/cm and 7.58mS/cm, respectively. The average of ELMAX(maximum electrical conductivity) was 7.48mS/cm and that of ELAD(beginning peak difference of the electrical conductivity) was 0.61mS/cm. While the total milk yields for DMHG, tMHG(duration of the main milking phase), tPL(duration of the plateau phase), tAB(duration of the descending phase) and tMGG were positively correlated(0.35~0.54), those for tMBG and SPL were negatively correlated(－0.11 and －0.27). As the DMHG increased, tMHG, tPL, tAB, tMGG and SPL decreased. While the cows with higher electrical conductivity at the beginning of milking had less somatic cell counts, cows with higher electrical conductivity after the peak of milk yield had more somatic cell counts. The results of this experiment indicated that through milking based on milking and lactating standards and the regular checking of milking status, the qualities of milk and milk yields could be improved.
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KEYWORD
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Milk flow, tMGG, Electrical conductivity, Somatic cell
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