siring

verb

1. (form-of, gerund, participle, present)present participle and gerund of sire

noun

1. An act of procreation, especially between animals.

   “As the gestation length of horses and ponies is on average 336 days with a range of 315 to 365 days (Rossdale 1967), foals resulting from late May and early June sirings would be born throughout May the following year.”