Abstract #M49
Section: Animal Health (posters)
Session: Animal Health Posters 1
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Exhibit Hall A
Session: Animal Health Posters 1
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Exhibit Hall A
# M49
Prevalence of subclinical ketosis and its effects on milk production and blood chemistry in high-yielding dairy cattle.
F. M. Shohel Al*1, H.-W. Lee2, B. Park3, S. Jin1, S.-S. Lee1, S. Kwon4, E. Kim5, Y.-I. Cho1, 1Sunchon National University, Suncheon-si, Republic of Korea, 2Mari Animal Medical Center, Yongin-si, Republic of Korea, 3Animal Clinic of Hongseong Naknong Nonghyup, Hongseong-gun, Republic of Korea, 4Woo Sarang animal clinic, Yongin-si, Republic of Korea, 5National Institute of Animal Science, Cheonan-si, Republic of Korea.
Key Words: subclinical ketosis, prevalence, milk yield
Prevalence of subclinical ketosis and its effects on milk production and blood chemistry in high-yielding dairy cattle.
F. M. Shohel Al*1, H.-W. Lee2, B. Park3, S. Jin1, S.-S. Lee1, S. Kwon4, E. Kim5, Y.-I. Cho1, 1Sunchon National University, Suncheon-si, Republic of Korea, 2Mari Animal Medical Center, Yongin-si, Republic of Korea, 3Animal Clinic of Hongseong Naknong Nonghyup, Hongseong-gun, Republic of Korea, 4Woo Sarang animal clinic, Yongin-si, Republic of Korea, 5National Institute of Animal Science, Cheonan-si, Republic of Korea.
The objectives of this study were to determine the prevalence of subclinical ketosis (SCK) and evaluate the effects of SCK on milk production and blood chemistry of Holstein cows in Korean dairy farms. The study was carried out from 2017 to 2018 in 6 provinces of South Korea with 49 herds and 905 Holstein cows. Experimental animals were selected randomly from 5 different lactation period. Milk production, parity, and stages of lactation were recorded from each farm. Blood samples were analyzed by using Biochemical Analyzer to determine 11 biochemical indices. Statistical analysis was done using SPSS 16.0 and data were presented as mean ± SE. Animals were categorized into normal (<1.2 mmol/L), sub-clinical (1.2–2.9 mmol/L) and clinical (>2.9 mmol/L) ketosis (CK) groups based on their β-hydroxybutyric acid concentration in blood. Overall, the prevalence of SCK was 23.60%, which varied among herds. Among 49 herds, 8 herds had > 40% of SCK, and 15 herds had 20–40% SCK. The highest prevalence of SCK was observed in 1st parity with 33.33%, followed by 30.27%, 20.57%, and 5.12% in 2nd, 3rd, and 4th parities, respectively. However, the CK prevalence was highest in 3rd parity (25%). The SCK prevalence was highest (31.03%) at early lactation stages (0–49 DIM) compared with other lactation periods. The milk yield decreased significantly by 11% in SCK (normal: 38.79 ± 4.98, SCK: 34.49 ± 1.64 L/day; P = 0.028) animals. The animals with SCK had significantly higher aspartate aminotransferase (normal: 109.16 ± 1.53, SCK: 110.66 ± 2.29 IU/L; P = 0.035) and total bilirubin (normal: 0.39 ± 0.01, SCK: 0.44 ± 0.02 mg/dl; P = 0.001) concentrations and significantly lower blood glucose (normal: 51.08 ± 0.51, SCK: 46.15 ± 0.86 mg/dl; P = 0.001) concentration than normal animals. This is a recently conducted population based study that shows the nationwide prevalence of SCK in Korea. The results of this study will provide important information to farm practitioners and producers to be aware of the milk yield loss due to SCK during farm management.
Key Words: subclinical ketosis, prevalence, milk yield
