Date of Award:
5-1-1979
Document Type:
Thesis
Degree Name:
Master of Science (MS)
Department:
Biology
Department name when degree awarded
Life Sciences:Biology
Committee Chair(s)
James A. Gessaman
Committee
James A. Gessaman
Committee
Keith L. Dixon
Committee
LeGrande C. Ellis
Abstract
1. Photoperiods of 12 or 15 hr duration stimulate testicular growth in captive black-billed magpies (Pica pica hudsonia) at both 2 and 20°C; 9-hr photoperiods do not initiate growth at 20°C. 2. Cold temperatures (2°C) inhibit testicular development at 12-hr photoperiods; a slight inhibition occurs at 15-hr photo-periods. The inhibitory effect of cold temperatures on testicular growth in magpies at 12-hr photoperiods is greater than in any species similarly investigated. 3. An estimate of the effect of cold temperature on vernal testicular growth in wild magpies is calculated, and the adaptive value of temperature modulation of photoperiodically induced testicular growth is discussed.
Recommended Citation
Jones, Lee R., "The Effect of Photoperiod and Temperature on Testicular Growth in Captive Black-Billed Magpies" (1979). Biology. 442.
https://digitalcommons.usu.edu/etd_biology/442
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