Animal-level factors affecting the results of the first single intradermal test for bovine tuberculosis in dairy calves in Chiang Mai, Thailand

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Tawatchai Singhla
Sukolrat Boonyayatra
Scott J. Wells


The objective of this study was to identify animal-level factors affecting bovine tuberculosis (bTB) status as determined by the single intradermal tuberculin (SIT) test firstly applied to 1 year-old dairy cattle in Chiang Mai, Thailand. A total of 137 6-month-old calves were randomly selected from 28 small-holder dairy farms in Chiang Mai province, Thailand. Individual data of calves including history of bTB of the farms, bTB status of the dams, general farm management, average dairy gain (ADG) of the calves, occurrence of other diseases, and contacts with other animal species, were collected monthly for 6 months. At ≥ 12 months of age, calves were firstly tested for bTB using the SIT test. Firth penalized logistic regression was used to analyze the associations of factors affecting bTB status of calves. The result showed that more SIT reactors were detected among selected calves from farms with a history of bTB (11.5%, 7/61) compared to those farms with no history of bTB (1.3%, 1/76) (p < 0.05). From the logistic regression analysis, we found that calves with high ADG were less likely to become SIT reactors at their first SIT test compared to those with low ADG (p < 0.01). To control bTB in dairy cattle, farm practices to limit contact between adult cattle and young calves, together with proper nutritional management for calves are recommended

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Singhla, T., Boonyayatra, S., & Wells, S. J. (2017). Animal-level factors affecting the results of the first single intradermal test for bovine tuberculosis in dairy calves in Chiang Mai, Thailand. Veterinary Integrative Sciences, 15(3), 147–155. Retrieved from
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