Fig. 4.

Proportion of percent of clinical mastitis cases of different stage of lactation period in different parity of Holstein dairy cows in autumn (a) and winter (f); Lowess curves of clinical mastitis cases which show the general trend of clinical mastitis incidence during a lactation period in different parity in autumn (b) and winter (g); Occurrence time (day) of clinical mastitis in different parity of each lactation period in autumn (c, d, and e) and winter (h, i, and j). Different symbols show significant different between bars (p < 0.05).