16 octubre 2015
In horse breeding, stallions are usually used to establish a breeding line. In some cases, however, the maternal lineage plays a more important role. Researchers have looked at the gestation length of different mare families and discovered that the length of gestation varies significantly from lineage to lineage. Certain families also produce more female offspring than male foals.
http://www.sciencedaily.com/releases/2015/10/151016084848.htm
