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Highlights

Considerable societal and clinical concern exists with respect to the outcome of teen pregnancies. In companion papers published in this issue (pp. 343 and 351), Luther et al. demonstrate that adolescent female sheep that become pregnant before they have achieved their own full growth may not be able to supply sufficient nourishment for their fetuses to develop without physical deficits. Limiting the food intake of adolescent ewes during pregnancy impairs the nutrient supply to the fetuses and slows the growth of fetal soft tissue, possibly due to a change in the development of the blood vessels supplying nutrients to the uterus and placenta during pregnancy. These findings could shed light on human teen pregnancies, where there may be competition for nutrients between the developing fetus and the mother who has not yet stopped growing.

Justin Luther, Raymond Aitken, John Milne, Masatoshi Matsuzaki, Lawrence Reynolds, Dale Redmer, and Jacqueline Wallace. Maternal and Fetal Growth, Body Composition, Endocrinology, and Metabolic Status in Undernourished Adolescent Sheep. Biol Reprod 2007; 77:343–350. Published online in BOR-Papers in Press 2 May 2007; DOI 10.1095/biolreprod.107.061440

Justin Luther, John Milne, Raymond Aitken, Masatoshi Matsuzaki, Lawrence Reynolds, Dale Redmer, and Jacqueline Wallace. Placental Growth, Angiogenic Gene Expression, and Vascular Development in Undernourished Adolescent Sheep. Biol Reprod 2007; 77:351–357. Published online in BOR-Papers in Press 2 May 2007; DOI 10.1095/biolreprod.107.061457

Sneaker fish equipped with quick sperm.

Males of shell brooding fish from Lake Tanganyika exhibit four behavioral reproductive strategies to score with choosy females. The four tactics, defined in the paper by Fitzpatrick et al. on p. 280, are pirate, territorial, satellite, and sneaker. Even though sneaker males do not compete actively with other males, guard a territory, or court females, they are endowed with more competitive sperm that swim more rapidly than their male competition. Thus, they are able to dodge in and score and perpetuate their sneaky genomes despite their poor standing. Interestingly, there are no obvious morphological differences in sperm from sneaker males than males with other tactics, suggesting that their quick strike capabilities could be energetic.

J. L. Fitzpatrick, J. K. Desjardins, N. Milligan, R. Montgomerie, and S. Balshine. Reproductive-Tactic-Specific Variation in Sperm Swimming Speeds in a Shell-Brooding Cichlid. Biol Reprod 2007; 77:280–284. Published online in BOR-Papers in Press 25 April 2007; DOI 10.1095/biolreprod.106.059550

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