author(s)
D Borpujari, K Sarma, FA Ahmed and K Lalrintluanga

abstract
The effect of clinical mastitis on reproductive performance in crossbred cows (Jersey +Holstein Friesian) under hilly condition was studied during the month of August, 2016 to May, 2018 in and around Aizawl district of Mizoram. The reproductive records of cows with clinical mastitis (n = 10) during transition period were compared with the records of cows without mastitis (n = 10). Clinical cases of mastitis were identified at every milking by the herd personnel based on abnormal milk or swelling of the mammary gland. Haematology showed significant (P<0.05) increase in leukocyte (12.47±0.28) in mastitic cows. Higher granulocytes level and lymphopenia was observed in mastitis affected cows. Biochemical estimation revealed significantly (P<0.05) higher level of Calcium and lower level of Phosphorus in mastitis affected cows compared to healthy one. Mastitic cows showed more duration of calving to first service (215±44.90 days) and calving to conception (297±34.80 days) than non-mastitic cows (78.88±3.86 and 133.32±12.90 days).