Journal of Food, Agriculture and Environment

Vol 3, Issue 2,2005
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Prevalence of risk factors for bovine subclinical mastitis in two major dairy areas of Trinidad


Lisa Benjamin, Abiodun Adesiyun*, Winthrop Harewood

Recieved Date: 2004-12-19, Accepted Date: 2005-03-11


A study was conducted in two major dairy areas (Carlsen Field and Waller Field) to determine the risk factors associated with subclinical mastitis and antimicrobial residues in milk. A comprehensive questionnaire was administered to all 151 farms in both areas and used to determine the prevalent risk factors following which 5 farms each were selected from each area. A maximum of 5 milking cows per farm in early lactation were selected. The California mastitis test (CMT) was then performed on composite milk samples collected from each of the ten farms fortnightly for a period of 12-months to determine the prevalence of subclinical mastitis. Most of the farms were categorized as employing fair sanitary practices, 38 (51.4%) of 74 in Carlsen Field and 50 (64.9%) of 77 in Waller Field (P>0.05; χ²). Hand-milking, as opposed to machine-milking, was practised by most farms in both areas, 67 (90.5%) of 74 farms in Carlsen Field and 64 (83.1%) of 77 farms in Waller Field. The use of tanks for storage of water from the water service provider, was more prevalent in Carlsen Field (45.9%) than in Waller Field (29.9%) (P>0.05). Daily water shortages were reported more frequently in Carlsen Field (33.8%) than in Waller Field (5.2%) (P<0.05; χ²). In Carlsen Field, 56 (75.7%) farms routinely screened for mastitis compared with 56 (72.7%) in Waller Field (P>0.05); teat dipping was practised by 24 (32.4%) and 21 (27.3%) farms respectively (P>0.05) and the frequency of use of dry cow therapy was 63.5% (47 of 74) and 50.6% (39 of 77) respectively (P>0.05). Over the 12-month study period the prevalence of subcilinical mastitis was 17.6% (97 of 469 observations) on 6 farms with four or more risk factors for subclinical mastitis compared with a prevalence of 20.7% (97 of 469) for 4 farms with 4 or less risk factors (P>0.05). It was concluded that the interplay of various types of the risk factors present on dairy farms in Trinidad affected the prevalence of subclinical mastitis on the farms.


Risk factors, bovine, subclinical mastitis

Journal: Journal of Food, Agriculture and Environment
Year: 2005
Volume: 3
Issue: 2
Category: Food and Health
Pages: 56-61

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