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Proc Biol Sci. 1999 September 7; 266(1430): 1759–1764.
PMCID: PMC1690205

Sperm mobility determines the outcome of sperm competition in the domestic fowl.

Abstract

The aim of this study was to establish whether the mobility of sperm of the domestic fowl, as measured by an in vitro assay, predicted the outcome of sperm competition. Thirteen pairs of New Hampshire roosters, comprising one male categorized as having high-mobility sperm and the other as having average-mobility sperm, were used. Each male provided 25 x 10(6) sperm, which were mixed and artificially inseminated into between four and seven New Hampshire hens, each of which produced 2-11 offspring. The experiment was conducted twice, such that the same pair of males inseminated the same females. Paternity was assigned by using microsatellite markers. There was a clear effect of sperm-mobility phenotype on the outcome of sperm competition: in all 13 pairs the high-mobility male fathered the majority of offspring (75.3% overall; p < 0.0001). The proportion of offspring fathered by the high-mobility male within pairs varied significantly between male pairs (p < 0.0005). This effect was associated with the difference in sperm-mobility scores between males within pairs; there was a significant positive relationship between the proportion of offspring fathered by the high-mobility male and the ratio of mobility scores between males (p < 0.05). In addition, compared with their success predicted from the non-competitive situation, in the competitive situation high-mobility males were disproportionately successful in fertilizing eggs compared with average-mobility males. This may occur because female sperm storage is limited in some way and a greater proportion of high-mobility sperm gain access to the female's sperm storage tubules. There was no evidence that female effects accounted for any of the variation in paternity.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Wilson N, Tubman SC, Eady PE, Robertson GW. Female genotype affects male success in sperm competition. Proc Biol Sci. 1997 Oct 22;264(1387):1491–1495. [PMC free article]
  • Zeh JA, Zeh DW. The evolution of polyandry II: post-copulatory defenses against genetic incompatibility. Proc Biol Sci. 1997 Jan 22;264(1378):69–75. [PMC free article]

Articles from Proceedings of the Royal Society B: Biological Sciences are provided here courtesy of The Royal Society