Monitoring the changes in the composition of milk fat and milk solids not fat in cow milk before and after the occurrence of mastitis at different lactation stages

A study was conducted to determine how clinical mastitis affects the composition of major milk constituents in dairy cows before and after occurrence of mastitis at different lactation stages. The milk samples were collected local farmers from western districts of Tamil Nadu. For each dairy cow Fat percent and Solids Not Fat percent before and after mastitis at an interval of 10 days was recorded. A total of 54 mastitis affected milch cows were selected. 18 milch cows were studied in each stages during early lactation, mid lactation and late lactation. Six milch cows from each breed viz., Kankayam, Holstein Friesian cross breed, Jersey cross breed were selected in in each stages during early lactation, mid lactation and late lactation. Mean of highest fat percent for Kankayam breed was recorded in late lactation period (5.56±0.06) and the lowest fat percent after 10 days of mastitis affected. Kankayam breed was recorded in early lactation period as (3.95±0.11). Mean of highest fat percent for Holstein cross breed milch cows was recorded in late lactation period (3.72±0.01) and the lowest fat per cent after 10 days of mastitis affected Holstein cross breed milch cows was recorded in early lactation period (3.01±0.02). Mean of highest fat percent for Jersey cross breed milch cow were recorded in late lactation period (3.72±0.01) and the lowest fat per cent after 10 days of mastitis affected. Jersey cross breed were recorded in early lactation period (3.01±0.02). The fat per cent of Kangayam milch cows, Holstein cross breed milch cows, Jersey cross breed milch cows in early, mid and late lactation period before mastitis and 10 days after mastitis infection differed significantly. (p?0.05). Mean of highest Solids Not Fat per cent for Kankayam breed was recorded in early lactation period (8.41±0.05) and the lowest Solids Not Fat per cent for Kankayam breed was recorded in late lactation period 10 days after mastitis infection as (7.98±0.13). Mean of highest Solids Not Fat per cent for Holstein cross breed milch cows was recorded in early lactation period (7.75±0.03) and the lowest Solids Not Fat per cent after 10 days of mastitis affected Holstein cross breed milch cows was recorded in early lactation period (7.01±0.1). Mean of highest Solids Not Fat per cent for Jersey cross breed milch cows were recorded in early lactation period (8.55±0.03) and the lowest Solids Not Fat per cent after 10 days of mastitis affected breed Jersey cross was recorded in late lactation period (7.99±0.11). The Solids Not Fat per cent of Kankayam breed milch cows, Holstein cross breed milch cows Jersey cross breed milch cows in early, mid and late lactation period before mastitis and 10 days after mastitis infection differed significantly. (p?0.05).