Semen characteristics.

<p>Semen characteristics (means ± 95% CI over averages of three ejaculates per stallion) after exposure to mares (A, C) or to stallions (B, D), plotted separately for mean sperm number (A, B), mean VCL (C, D), and each for stallions who were first exposed to other stallions and then to mares, and for stallions who were first exposed to mares and then to other stallions. The numbers of stallions per treatment are indicated in the figure (one stallion had to be euthanized before the last semen collection–see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0143185#sec002" target="_blank">Methods</a>). See Tables <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0143185#pone.0143185.t001" target="_blank">1</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0143185#pone.0143185.t002" target="_blank">2</a> for statistics.