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Twenty-two Costa Rican dairy herds were actively monitored for vesicular diseases between November 1991 and March 1992, in anticipation of the annual dry season occurrence of vesicular stomatitis (VS). Thirty-nine confirmed cases of VS were concentrated on nine farms, resulting in an average herd in...
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With increasing levels of anthelmintic resistance worldwide and a growing demand to produce more organic products, utilisation of control strategies for gastrointestinal nematodes (GIN) that minimize the use of anthelmintics becomes even more important. This study evaluated the farm-level performanc...
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The ELISA tests that are available to detect an infection with Mycobacterium avium subsp. paratuberculosis (MAP) have a limited validity expressed as the sensitivity (Se) and specificity (Sp). In many studies, the Se and Sp of the tests are treated as constants and this will result in an underestima...
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Blood was drawn from 1530 dairy cows in 51 herds. For antibodies against bovine leukemia virus, Mycobacterium avium subspecies paratuberculosis, and Neospora caninum, 37.4%, 2.7%, and 5.6% of cows were test positive, respectively, while 29.2% of herds had unvaccinated animals with > or = 1:64 for...
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Rev. of Bovine viral diarrhea virus: diagnosis, management and control, by S.M. Goyal and J.F. Ridpath
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Animal studies and epidemiological evidence suggest an association between prenatal exposure to drinking water with elevated nitrate (NO3-N) concentrations and incidence of congenital anomalies. This study used Geographic Information Systems (GIS) to derive individual-level prenatal drinking-water n...
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The objectives of this thesis were: 1) to determine which factors and biological samples were associated with the estimated amount of total arsenic (As) consumed from water and food; 2) to determine which factors were associated with the concentration of total and speciated As ([As]) in urine; 3) to...
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A study was conducted in sheep on Canadian farms to describe the relationship between packed cell volume (PCV) or fecal egg counts (FEC) and subjective clinical parameters that may indicate the severity of parasitic gastroenteritis. Twenty-one farms in Ontario (ON) and 8 farms in Quebec (QC) were pu...
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Kenyan community leaders called for strengthened sustainable livelihoods for farmers and in 1992 formed a self-help dairy group that was reorganized in 2009 to form the Wakulima Dairy Ltd. (WDL). At WDL, members sell surplus milk to the dairy and, through nongovernmental organization (NGO) partnersh...