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Evaluation of the use of dry cow antibiotics in low somatic cell count cows.

Scherpenzeel, CG, den Uijl, IE, van Schaik, G, Olde Riekerink, RG, Keurentjes, JM and Lam, TJ (2014) Evaluation of the use of dry cow antibiotics in low somatic cell count cows. J Dairy Sci, 97 (6). pp. 3606-3614.

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The goal of dry cow therapy (DCT) is to reduce the prevalence of intramammary infections (IMI) by eliminating existing IMI at drying off and preventing new IMI from occurring during the dry period. Due to public health concerns, however, preventive use of antibiotics has become questionable. This study evaluated selective DCT in 1,657 cows with low somatic cell count (SCC) at the last milk recording before drying off in 97 Dutch dairy herds. Low SCC was defined as <150,000 cells/mL for primiparous and <250,000 cells/mL for multiparous cows. A split-udder design was used in which 2 quarters of each cow were treated with dry cow antibiotics and the other 2 quarters remained as untreated controls. The effect of DCT on clinical mastitis (CM), bacteriological status, SCC, and antibiotic use were determined at the quarter level using logistic regression and chi-squared tests. The incidence rate of CM was found to be 1.7 times (95% confidence interval = 1.4-2.1) higher in quarters dried off without antibiotics as compared with quarters dried off with antibiotics. Streptococcus uberis was the predominant organism causing CM in both groups. Somatic cell count at calving and 14 d in milk was significantly higher in quarters dried off without antibiotics (772,000 and 46,000 cells/mL, respectively) as compared with the quarters dried off with antibiotics (578,000 and 30,000 cells/mL, respectively). Quarters with an elevated SCC at drying off and quarters with a positive culture for major pathogens at drying off had a higher risk for an SCC above 200,000 cells/mL at 14 d in milk as compared with quarters with a low SCC at drying off and quarters with a negative culture for major pathogens at drying off. For quarters that were culture-positive for major pathogens at drying off, a trend for a higher risk on CM was also found. Selective DCT, not using DCT in cows that had a low SCC at the last milk recording before drying off, significantly increased the incidence rate of CM and SCC. The decrease in antibiotic use by drying off quarters without DCT was not compensated by an increase in antibiotic use for treating CM. Total antibiotic use related to mastitis was reduced by 85% in these quarters.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Scherpenzeel, CG
den Uijl,
van Schaik, G
Olde Riekerink, RG
Keurentjes, JM
Lam, TJ
Date : 2014
DOI : 10.3168/jds.2013-7655
Uncontrolled Keywords : intramammary infection, mastitis, selective dry cow therapy, Animals, Anti-Bacterial Agents, Cattle, Cell Count, Corynebacterium, Dose-Response Relationship, Drug, Escherichia coli, Female, Klebsiella, Lactation, Logistic Models, Mammary Glands, Animal, Mastitis, Bovine, Milk, Parity, Prevalence, Staphylococcus aureus, Streptococcus
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 10:29
Last Modified : 24 Jan 2020 19:25

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