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The effects of semen collection on fertility in captive, naturally fertile, sandhill cranes

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Abstract

We tested to see if semen collection interferes with fertility in naturally fertile pairs of cranes. We used 12 naturally fertile, Florida sandhill crane (Grus canadensis pratensis) pairs for this study, 6 control and 6 experimental. All pairs had previously produced fertile eggs. Semen was collected on Tuesday mornings and Friday afternoons from 26 February 1993 to 4 June 1993. We used standard artificial insemination methods to collect and to evaluate the semen and spermatozoa. Semen collection had minimal effect on semen quality and semen quantity. Semen volume, sperm density, sperm motility, sperm morphology, sperm viability, sperm number per collection, and male response to semen collection exhibited significant daily variation. Although semen collection began 13 days before the first egg in the experimental group, we did not observe differences in the date of first egg laid or in fertility between experimental and control groups. Also, we observed no statistically significant differences in the interval between clutches or in the percentage of broken eggs between experimental and control groups. However, 4 eggs were broken by adults during the disturbance associated with capturing birds for semen collection. We found that females with mates from which we consistently gathered better semen samples produced fewer fertile eggs than females with sires producing poorer semen samples (r = 0.60). We interpret these results to mean that males that were successfully breeding with their mates had little left at the time of our collection.

Additional Publication Details

Publication type:
Book chapter
Publication Subtype:
Book Chapter
Title:
The effects of semen collection on fertility in captive, naturally fertile, sandhill cranes
Year Published:
2001
Language:
English
Publisher:
North American Crane Working Group
Publisher location:
Seattle, Washington
Contributing office(s):
Patuxent Wildlife Research Center
Description:
226
Larger Work Type:
Book
Larger Work Subtype:
Other Government Series
Larger Work Title:
Proceedings of the eighth North American crane workshop
First page:
185
Last page:
194
Number of Pages:
226