Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: Marla L. Truscott x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract

Objective—To compare efficacy of a topically administered nonantimicrobial cream with that of lincomycin for treatment of digital dermatitis in dairy cattle.

Design—Randomized clinical trial.

Animals—98 cows from a commercial Holstein dairy herd.

Procedure—Cows with active lesions of digital dermatitis identified on a single observation day were randomly assigned to receive a nonantimicrobial cream, lincomycin paste, or no treatment. Cows were examined approximately every 4 weeks for 130 days after treatment for lesion maturity score, score for signs of pain, lesion size, and lesion activity.

Results—29 days after a single treatment, both treated groups had significantly reduced scores for signs of pain, lesion activity, lesion size, and the decision to retreat, compared with findings in the untreated group. Efficacy of the 2 treatments was not significantly different for decreasing pain score or lesion activity or for increasing lesion maturity score, but lincomycin was significantly more efficacious in decreasing lesion size and avoiding retreatment. By use of multivariate logistic regression, lactation number was a significant treatment effect modifier on the outcome of a healed lesion after treatment. Cows with ≥ 3 lactations were more likely to have a healed lesion at 29 days, compared with first- and secondlactation cows.

Conclusions and Clinical Relevance—Because antimicrobial treatments for digital dermatitis in cows require a veterinarian's prescription, the nonantimicrobial cream could serve as a viable but less consistently effective alternative to antimicrobials and could be applied by veterinarians, hoof trimmers, and others. (J Am Vet Med Assoc 2001;219:1435–1438)

Full access
in Journal of the American Veterinary Medical Association

Abstract

Objective—To identify potential risk factors for embryonic loss before 35 to 42 days of gestation in dairy cattle.

Design—Prospective observational study.

Animals—381 cows.

Procedure—Body condition score was determined at the time of artificial insemination (AI; day 0) and on days 20, 23, and 27 and between days 35 and 41; serum progesterone concentration was measured on days 0; 20 or 21; and 23, 24, or 25. Cows were excluded from analyses if day 0 serum progesterone concentration was ≥ 1.0 ng/mL and classified as pregnant on day 23 if serum progesterone was > 1.5 ng/mL on day 20 or 21 and day 23, 24, or 25. Cows were examined via transrectal ultrasonography on day 27 or 28 and rectally palpated for pregnancy on days 35 to 41.

Results—39% of cows that were pregnant on day 23 lost their embryo by day 27, and 18% of cows that were pregnant on day 27 or 28 were not pregnant on days 35 to 41. Breeding a pregnant cow posed the greatest risk for embryonic loss at both time periods. Mean serum progesterone concentrations on day 21 or 22 and day 23, 24, or 25 were lowest for cows that lost an embryo between days 24 and 28. Cows with a linear somatic cell count score > 4.5 before AI were twice as likely to lose the embryo by 35 to 41 days, compared with cows with a score < 4.5.

Conclusions and Clinical Relevance—Results suggest that embryonic loss could be reduced by more accurate estrus detection, reducing mastitis, and strategies to improve progesterone concentration after breeding. (J Am Vet Med Assoc 2005;226:1112–1118)

Full access
in Journal of the American Veterinary Medical Association