R.S. Chauhan born on September 10th, 1958 in a farmer's family, Dr. Chauhan completed his Bachelors (80.3%) with honours, Master (85.8%) and Doctoral degree (90.0%) in Veterinary Sciences with specialization in veterinary pathology from G.B. Pant University of Agric. & Tech., Pantnagar. He served the country in various capacities including Assistant Professor/ADIO (1983-96), Associate Professor (1996-1999), National Fellow (1999-2004) and Joint Director (CADRAD), IVRI, Izatnagar(2004-2009), Director & Vice-Chancellor(2009), ICAR-IVRI and Campus Director, IBT, Patwadangar (2009-2013). During his tenure as academician and scientist, he has written 112 books including 35 manuals and 1 monograph very popular among the students world over. He contributed 99 chapters in different books and published 235 research and 59 review papers. Besides, he participated in International / National Conferences and presented 178 papers. He is life member of 15 scientific bodies and has been in several executive committee such as Chairman, Panch Gavya Professionals’ Club; President, Cow Therapy Society; Secretary-General, Society for Immunology and Immunopathology; Vice President, Indian Society of Veterinary Educators; Zonal Secretary, Indian Association of Veterinary Pathologists and Joint Secretary, Indian Virology Society, President, Dr. J.L. Vegad Foundation, Expert Member Research Group, Committee for Certification of Pathologists, Vice-President, IAVP; Registrar, ICVP, etc.Based on his contributions and scientific achievements, he has been awarded with several prizes, medals and honours including Best Young Scientist Award (1992), IAAVR Award (1996), National Fellow Award (1999), Fellow NAVS (2000), Fellow SIIP (2001), K.S. Nair Memorial Award (1999), Vigyan Bharti Award (2000), Dr. C.M. Singh Trust Award (2002), Dr. Rajendra Prasad Award (2002), Shri Ramlal Agrawal National Award (2000), Best Paper Award SIIP (2003), Best Paper Award IAVA (2001, 2002, 2003), Best Teacher Award (2004) by GBPUAT, Fellow, IAVP (2006), Gopal Gaurav (2007), Bharat Excellence Award (2007), Diplomat, ICVP (2008), Intas ISVE Best Veterinary Scientist Award (2008), Best Academician Award (2012), Moropant Pingle Go Sewa National Award (2015), Outstanding Scientist Award (2019), Research Excellence Award (2020), Indo Asian Claude Bourgelat Distinguished Innovative Scientist Award-2020 in Animal Immunopathology and MAN OF COWPATHY at GADVASU Ludhiana etc. in recognition of his research and teaching endeavor. He has been inducted in many national and international scientific/advisory committees and boards including Member, WHO/IPCS Committee on Environmental Health Criteria. Dr. Chauhan has advanced scientific field in many new veterinary diseases including Enterotoxaemia, Pyometra, ETEC infection in camels, isolated camel pox virus, developed rapid diagnostic test DIA for the first time in India. He reported role of cell mediated immunity in rotavirus infection in calves. His pioneer work includes immunopathology due to pesticides, heavy metals, mycotoxins and nanoparticles. Dr. Chauhan developed a new method using MTT dye for detection of CMI response. He has scientifically validated Panchgavya and named it as “Cowpathy”.He have been recognized internationally as visiting Professor, University of Wageningen The Netherlands and as Scientific Advisor, The World Health Organization (WHO). Dr. Chauhan guided more than 50 scholars for their Masters and Doctoral research; most of them are placed as Professors, Scientists, Officers in Indian Army, banks and industry in India and abroad. At present he is working as Head Veterinary Pathology, Chairman Scientific Advisory Committee ICMR-NARFBR, Member AWBI and CPCSEA (Govt of India). Prof Chauhan superannuated on 30th June 2024 after distinguish service of 41.5 years and still contributing to the profession through lectures, writings and research and particularly developing literature/ books for the benefit of students and young scientists.

• 1 Introduction2 Understanding Panchgavya: Its Composition, Benefits, and Uses3 Career4 A Great Teacher (GURU) and A Renowned Scientist5 The Foundations of Compassion: Early Years6 Celebrating Dr. Chauhan Outstanding Achievement: A Testament to Dedication and Excellence7 A Trailblazer in Veterinary Science: Celebrated Journey of Excellence8 The Legacy of Dr. Chauhan: A Journey of Triumph and Compassion9 Personal Philosophy10 Future Goals of Dr. Chauhan in Expanding the Scope of Veterinary Science11 The Community Engagements of Veterinary Scientist Prof Chauhan in Animal Welfare Activities12 Peer Review: What Others Say About Dr. R.S. Chauhan13 Cowpathy Publications14 Some Important Moments in The Eyes of Camera