author(s)
Brejesh Singh, PC Shukla, DK Gupta, Amita Tiwari and Arun Mourya

abstract
Subclinical mastitis (SCM) is considered more severe than clinical mastitis, as early detection is impossible without regular monitoring. In this study, a total of 668 lactating goats were tested using modified california mastitis test (MCMT), somatic cell count (SCC), milk pH and electrical conductivity (EC). The overall occurrence of infected animals was found to be 29.94 per cent on animal basis and 28.65 per cent on udder halves basis. The occurrence was higher in right udder halves and breed wise higher in Jamnapari goats. The age wise occurrence of SCM showed i.e. highest in goats of 4 years and above age. The lactation / parity wise occurrence of SCM showed i.e. highest in 4^th and more lactation and early lactation stage of each parity. Apparently healthy lactating goats had mean value of SCC 5.66 ± 0.33 × 10⁵ cells/ml. The mean SCC in SCM (15.16 ± 0.31 × 10⁵ cells/ml) was significantly (p≤ 0.05) increased as compared to control. Apparently healthy lactating goats had mean value of Milk pH 6.57 ± 0.04. The mean milk pH in SCM (7.39 ± 0.04) was significantly (p≤ 0.05) increased as compared to control. Apparently healthy lactating goats had mean value of EC 4.36 ± 0.05 mS/cm. The mean EC in SCM (6.51±f 0.04 mS/cm) was significantly (p≤ 0.05) increased as compared to control.