Rajapaksha, R. M. C.2024-09-062024-09-062014https://ir.lib.pdn.ac.lk/handle/20.500.14444/738The objective of this study was to determine the association between fertility and mastitis in dairy cows in Galnewa veterinary division . Other factors that affect on reproductive performance also were examined in 80 milking cows in Galnewa veterinary division. Cows were sorted into sub fertile group (n=40) and fertile group (n=40). A pre tested interviewer based questionnaire was used to collect data and all cows were clinically examined by me. The Jersey cross bred cows have 0.8 odds (95% CI =0.33-2.0) of getting sub fertility than Sahiwal cross bred cows. The cows older than 6 years had 0.39 odds (95% CI =0.15-1.0) of getting sub fertility compared to those who were less than 6 years of age. The cows with higher yield of milk had 3.4 odds (95% CI =1-10.6) of reporting sub fertility compared to those who produce less than 6 liters per day. When the parity of the cows were more than 3 the odds of reporting subfertility was 2.5 (95%CI=1-6.4) compared to those who were younger. The cows with Body Condition Score (BCS) less than 2.75 had 4.6 odds(95%CI=1.59-13.49) of getting sub fertility compared to those who had BCS higher than 2.75. Dystocia has no significant odds 0.5 (95% CI =0.04-5.59) to be reported in relation to sub fertility. The cows with retained placenta had 2.6 odds (95% CI =0.625-10.95) of reporting sub fertility compared to those who did not have retained placenta.The proportion of uterine prolaps and metritis is among the cows studied with subfertility were 5% and 7.5% respectively. Mastitis positive cows have 3.7 odds (95% CI =1.29-11.05) of getting subfertility than cows without mastitis. Out of fourty cases 50% of cows show normal inter oestrous interval. Cows havingfollicular cyst and luteal cyst, as clinically diagnosed were 7.5% and 5% respectively from among the cows with sub fertility. It can be concluded that mastitis increase the odds of getting sub fertility.en-USCowMastitisFertilityThesis