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American Zoologist 1973 13(1):85-90; doi:10.1093/icb/13.1.85
© 1973 by The Society for Integrative and Comparative Biology
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Use of Bullfrogs in Biological Research

DUDLEY D. CULLEY, JR.
School of Forestry and Wildlife Management, Louisiana Stale University Baton Rouge, Louisiana 70803

This paper points out some deficiencies of bullfrogs now used in biological research. The need for obtaining stocks with information on geographical origin, age, nutrition, general health, and environmental conditions under which they were maintained or reared is paramount and can be obtained from commercial dealers. Growth rates and food utilization data with regard to bullfrog age and geographical origin are discussed in relation to the effects these characteristics may have on data interpretation in many research projects. The logic of utilizing only large bullfrogs in research is discussed. Motile sperm of males grown under laboratory conditions can be obtained in three months after metamorphosis, and in females, eggs approaching maturity are produced in six months after metamorphosis.


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