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  • Author or Editor: Eugene D. Janzen x
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To determine seroprevalence of Neospora caninum infection in beef herds and the association between serologic status and rate of abortion, stillbirth, calf mortality, and reproductive failure.


Longitudinal study.


419 cows from 8 beef herds in central Alberta.


1,391 serum samples from a serum bank were analyzed, using ELISA, and results were compared, using logistic regression, with productivity data on individual cows obtained from a database established during a 4-year period.


30% of cows were seropositive at some point during the 4-year period. Risks of abortion (odds ratio [OR], 5.7) and stillbirth (OR, 2.8) in seropositive cows were significantly greater than in seronegative cows. Risks of being culled for any reason (OR, 1.9) or for reproductive failure (OR, 2.5) in seropositive cows were also significantly greater than in seronegative cows. Changes in titer with time in individual cows and a lack of association between serologic status of dam versus daughter suggest that postnatal transmission was possible in these herds. However, horizontal transmission did not appear to play a substantial role in abortions that occurred in these herds.

Clinical Implications

Neosporosis should be investigated as a potential source of economic loss to the beef industry. (J Am Vet Med Assoc 1998;213:685-690)

Free access
in Journal of the American Veterinary Medical Association


Objective—To investigate the effect of routine dental floating on weight gain, body condition score, feed digestibility, and fecal particle size in pregnant mares fed various diets.

Design—Randomized controlled clinical trial.

Animals—56 pregnant mares.

Procedure—Mares were randomly allocated to 1 of 4 feed groups (n = 14 mares/group). All horses were sedated and an oral examination was performed, after which dental floating was performed on 7 horses in each group. Body weight was measured, and a body condition score was assigned before and at various times for 24 weeks after dental floating. Feed digestibility and fecal particle size were analyzed 7 and 19 weeks after dental floating.

Results—Weight gain, change in body condition score, feed digestibility, and fecal particle size were not significantly different between horses that underwent dental floating and untreated control horses. In contrast, weight gain was significantly associated with feed group. In the control horses, neither the number of dental lesions nor the presence of any particular type of lesion at the time of the initial oral examination was significantly associated with subsequent feed digestibility.

Conclusions and Clinical Relevance—Results suggest that dental floating does not result in significant short-term changes in body weight, body condition score, feed digestibility, or fecal particle size in healthy pregnant mares. Further studies are necessary to determine the clinical utility of regular dental floating in apparently healthy horses. (J Am Vet Med Assoc 2004;225:1889–1893)

Full access
in Journal of the American Veterinary Medical Association