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  • Author or Editor: Mark Carpenter x
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Abstract

Objective

To produce and characterize cell lines from canine primary appendicular osteosarcomas that induce transplantable tumors in athymic nude mice.

Animals

57 six- to 8-week-old female athymic nude mice.

Procedure

Canine primary appendicular osteosarcoma tumors were harvested and cell lines were produced. Canine osteosarcoma (COSCA)-Toby (COSCA-T; 10 mice), COSCA-Princess (COSCA-Pr; 16) or canine osteosarcoma D-17 (ATCC CCL-183; 31) cells were injected into the proximal portion of the left tibia of nude mice to evaluate tumor production from each cell line; the right tibia served as the control. Tibial measurements were taken on alternating days to evaluate tumor growth during a 6-month period. Student's t-tests were used to determine whether size of the proximal portion of the left and right tibias differed significantly during the observation period.

Results

88% of mice receiving COSCA-Pr and 50% of mice receiving COSCA-T cells developed a tumor at the injection site by 9 days after implantation. The D-17 cells induced tumors in 50% of injected tibias; however, tumors were not detected for 79 days. Tumors generated from COSCA-Pr and COSCA-T cells in nude mice were histologically similar to the canine tumor from which they were developed.

Conclusion

New osteosarcoma cell lines that can reliably and rapidly induce transplantable tumors in nude mice were developed.

Clinical Relevance

Use of cell lines will allow evaluation of new treatments of canine primary appendicular osteosarcoma in a nude mouse model. (Am J Vet Res 1998;59:359–362)

Free access
in American Journal of Veterinary Research

Objective

To estimate the marginal contribution of pasteurization of waste milk and colostrum to gross margin per calf at weaning and to estimate the minimum number of cattle on a dairy farm for pasteurization to be profitable.

Design

Randomized, controlled, clinical trial.

Animals

300 Holstein calves.

Procedure

The performance of calves fed pasteurized colostrum and waste milk was compared with the performance of calves fed nonpasteurized colostrum and waste milk. Costs, revenues, and gross margins for the 2 groups were compared.

Results

Calves fed pasteurized colostrum and waste milk were worth an extra $8.13 in gross margin/calf, compared with calves fed nonpasteurized colostrum and waste milk. The minimum number of cattle for which feeding pasteurized colostrum and waste milk was calculated to be economically feasible was 315 calves/d (1,260-cow dairy farm).

Clinical Implications

An economic benefit was associated with feeding pasteurized colostrum and waste milk. Additional benefits that may accrue include higher mean weight gain and lower mortality rate of calves as well as calves that have fewer days in which they are affected with diarrhea and pneumonia (J Am Vet Med Assoc 1996;209:751–756)

Free access
in Journal of the American Veterinary Medical Association