The Diagnosis and Management of subclinical mastitis is a comprehensive treatise on the basics of Udder anatomy,physiology, pathology, and biochemical changes.It deals with the latest preliminary and confirmatory diagnostic methods in detail. It also describes preventive and curative measures to contain environmental and contagious pathogens with parenteral and intramammary antibiotics and other alternative therapies.Since antibiotic residual problem for affecting the quantity and quality of milk and detrimental effect on public health.So a number of alternatives are mentioned in full length. General management of farm and dairy parlor is detailed.The extensively researched medication with TriSodium citrate over a million of cows is discussed and suggested as a viable alternative to the antibiotic.