*Induction and Synchronization of Estrus DOI: http://dx.doi.org/10.5772/intechopen.90769*

is well established [3]. Other examples include Aloes, Heat-Up, Fertivet, Heat-raj, etc. These can be applied in delayed puberty, postpartum anestrus, and other problems. Though they can induce estrus in crossbred cows, the conception rate is remained unchanged. *Aegle marmelos* and *Murraya koenigii* are two medicinal plants used for the treatment of reproductive problems in livestock as well as laboratory animals [4–6]. Feeding the leaves of these plants individually or combined can help in starting the cascade of reproductive cycle. It is believed that they act like the gonadotropins. The other possible mechanism behind its efficacy is the antioxidant effect of the plant-derived substances enhancing the luteal function. The demand and usefulness of the plant-derived medicines are increasing day by day. As these are easily available, are economical, and have fewer side effects, these preparations can be successfully utilized especially in village level. Many times, the poor farmers cannot afford the cost of the hormonal estrus inducers which are not always available also. In this situation, herbal mixtures have emerged as a better option. A large comparative study is required to use these drugs as alternative to hormones. It is also recommended that these should be used along with vitamin and mineral supplementation. Kumar and Singh [7] have also reported about the use of the pigeon waste in estrus induction. They fed 100 gm dried pigeon waste for 3 days to anestrus cows and heifers and successfully induced estrus in 40% cows and 44% heifers. This may be due to the high iron, zinc, and other mineral content in the pigeon waste.
