Browse > Article
http://dx.doi.org/10.5187/JAST.2009.51.4.265

Analysis of Daily Milking Flow in Holstein Dairy Cow Using the LactoCorder  

Cho, Kwang-Hyun (National Institute of Animal Science, RDA)
Choi, Jun-Pyo (JP Solution)
You, Byung-Wha (Namyangju Agricutural Extension Center)
Lee, Deuk-Hwan (Hankyong National University)
Kong, Hong-Sik (Hankyong National University)
Park, Kyung-Do (Hankyong National University)
Lee, Hak-Kyo (Hankyong National University)
Publication Information
Journal of Animal Science and Technology / v.51, no.4, 2009 , pp. 265-272 More about this Journal
Abstract
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 7.44 kg 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 0.14 kg, 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 3.03 kg/min, 2.94 kg/min and 2.05 kg/min, respectively and the average milking speed in Imsil-gun was slower than other regions. The average of tS500(time to reach 0.5 kg/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 0.58 min (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 6.81 mS/cm and 7.58 mS/cm, respectively. The average of ELMAX (maximum electrical conductivity) was 7.48 mS/cm and that of ELAD (beginning peak difference of the electrical conductivity) was 0.61 mS/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.
Keywords
Milk flow; tMGG; Electrical conductivity; Somatic cell;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Boettcher, P. J., Dekkers, J. C. M. and Kolstad, B. W. 1998. Development of an udder health index for sire selection based on somatic cell score, udder conformation and milking speed. J. Dairy Sci. 81:1157-1168.   DOI   ScienceOn
2 Dzidic, A., Kaps, M. and Bruckmaier, R. M. 2004. Machine milking of Istrian dairy crossbreed ewes : udder morphology and milking characteristics. Small Ruminant Research. 55:183-189.   DOI   ScienceOn
3 SAS User’s Guide : Statistics, Ver 9.1 Edition. 1999. SAS Inst., Inc., Cary, NC.
4 Schmidt, G. H., Van Vleck, L. D. and Hutjens, M. F. 1988. Principles of dairy science. 2nd ed. pp 78.
5 Zwald, N. R., Weigel, K. A., Chang, Y. M., Welper, R. D. and Clay, J. S. 2005. Genetic evaluation of dairy sires for milking duration using electronically recorded milking times of their daughters. J. Dairy Sci. 88:1192-1198   DOI   ScienceOn
6 농협중앙회. 2008. 2007년도 한국 유우군 능력검정 사업보고서. p23-24
7 안병석, 전병순, 백광수, 박성재, 이현준, 이왕식, 김상범, 박수 봉, 김현섭, 주종철, 아즈말칸. 2005. 착유우의 연속유량, 유량 변이, 유성분, 체세포수, 비유지속시간, 비유속도에 대한 산차, 착유시간, 유기 및 착유간격의 효과. 한국동물자원과학회지. 47(6):919-924