Speed of sperm on ejaculation

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The fertilization success in SAT treatment likely reflects the maximum possible success because of the relative high sperm density used in our assays. Only clutches of 20— yellowish, translucent eggs were used for IVF. We found no evidence that the subsample identity and hence preejaculation sperm age had any differential effect on offspring viability subset effect: Nadeau JH Do gametes woo? Males were stripped by gently squeezing in the cranio—caudal direction using a smooth-edged forceps, and the ejaculate was collected using a microcapillary aspirator tube assembly for details see ref. The potential role of diploid and haploid expression. Lindeman LCet al.

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Freely available online through the PNAS open access option.

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Haploid selection within a single ejaculate increases offspring fitness

In a broadcast spawning ascidian, Styela plicatalonger-lived sperm sired offspring with higher early-life survival 13and in the Atlantic salmon, Salmo salarsperm with intermediate longevity sired faster-hatching offspring One spermatogenic cycle in zebrafish lasts for about 6 d as shown by BrdU labeling and continuous sampling at different time points after BrdU exposure S6which is unusually repeat-rich 29 and did not feature in either of its bias comparisons Figs. An open question is whether within-ejaculate sperm variation is based on genetic mechanisms. Sperm size and number under gametic control. The exact IVF conditions differed slightly between experiment 1A and 1B and are described separately below. We will not speculate on the functional basis of these results with respect to specific genes or genomic regions at this point, because we need a stronger dataset with more males to support such speculation.

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