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KMID : 1023520150380030155
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Korean Journal of Veterinary Service
2015 Volume.38 No. 3 p.155 ~ p.162
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Investigation of the incidence rate of second grade milk in dairy farms on the central-southern region of Korea
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Jung Ji-Young
Yu Do-Hyeon
Shin Sung-Shik
Son Chang-Ho
Oh Ki-Seok
Suh Guk-Hyun
Hur Tai-Young
Jung Young-Hun
Choi Chang-Yong
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Abstract
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The incidence of second-grade milk production in 9 dairy farms of South Korea was investigated from May 2011 to March 2012, and the serum composition of cows producing first- and second-grade milk in 14 farms including the 9 farms was analyzed. The incidence rate of second-grade milk production of 402 cows in nine dairy farms located in the central and southwestern regions of Korea was 15.4% with the highest rate being 34.4%. Seasonal morbidity was higher during late winter (February) and early summer (June) with the highest rate observed in February (32.6%) followed by November (33.3%). Second-grade milk was most frequently found within one month postpartum (34.1%) while only 3.5% was found during the first 60∼90 days of lactating period (n=785, 5 herds). The morbidity increased thereafter (P＜0.05) with the highest observed between 270∼300 days of lactation (36.1%). The acidity was not significantly different between second-grade (0.159±0.026%) and first-grade milk (0.158±0.027%). Blood serum analysis of 371 cows in the 14 dairy farms indicated that aspartate aminotransferase (AST) level was significantly higher (P＜0.001) in cows producing second-grade milk while albumin was significantly lower (P＜0.001) than cows producing first-grade milk. Total protein and triglyceride was also significantly low along with glucose, non-esterified fatty acid and blood urea nitrogen in cows producing second-grade milk. Statistical analysis including sensitivity, specificity and positive/negative prediction values showed that lactating cows with high AST, low albumin, total protein and triglyceride levels in the serum tended to produce second-grade milk. It was concluded that serological parameters, especially live functional and metabolic-related serum compositions (AST, albumin, total protein and triglyceride), were significantly influenced in cows producing second-grade milk.
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KEYWORD
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Second-grade milk, Korean dairy farms, Serum analysis
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