Despite of foreign invasions, Ayurveda physicians continued their contributions and recorded their experiences in almost every century without deviating from the original principles laid by the seers at beginning. Books were written on veterinary science. A voluminous book on diseases of elephants is called Palakapya Samhita. The book on diseases of horses is called Shalihotra Samhita which contains 12000 verses, which is equivalent to the number of verses contained in Charaka Samhita. The similarity does not end with the number of verses. Just as Ayurveda is divided into 8 sections, this science has also been divided into 8 sections. Shalihotra Samhita has been translated into Persian, Arabic, Tibetan and English. The Persian translation dates back to 1387 AD. The section describing the diseases of cattle is called Gava Ayurveda. Senaak Ayurveda is the science of birds. The book written on plants, their diseases and propagation is Upavana Vinoda.
It can be said that the knowledge of Ayurveda came from a divine origin or from the findings of the deep thought, meditation of sages or from the instinct, experiment and experience of generations of humanity.
Ancient eight branches of Ayurveda are as follows