Reproductive Cloning
Asexual Reproduction
Overview of the Reproductive System
Aging
Disorders of the Female Reproductive System
Disorders of the Male Reproductive System
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Updated: Feb 7, 2026

Ultrasonography in Experimental Reproductive Investigations on Rats
Published on: December 2, 2017
Mariana Bertoncelli Tanaka1, Ashok Agarwal2, Sandro C Esteves3,4,5
1Division of Urology, Department of Surgery, University of Campinas (UNICAMP), Campinas, Brazil.
Advanced paternal age over 40 is linked to poorer semen quality. Its impact on fertility treatment success and offspring health requires more research, though risks are seen in natural conception.
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