Contraception can Lead to Trophic Asynchrony between Birth Pulse and Resources
Figure 2
Time between final contraceptive inoculation and first parturition from feral horse (Equus caballus) females.
Births shown are from horses at Little Books Cliffs Wild Horse Range, CO, USA and Pryor Mountain Wild Horse Range, MT, USA as a function of consecutive annual porcine zona pellucida (PZP) inoculations, 2005–2011.