This study aims to determine the environmental factors effected to lactation length (LL), lactation milk yield (LMY), calving intervals (CI) of Anatolian buffaloes in Bartın. In this study, 1511 milk yield data belonging to 762 Anatolian buffaloes and 957 CI data belonging to 543 Anatolian buffaloes which has been reared in different environmental conditions between 2015-2019 under the scope of the Anatolian Buffalo Breeding Project being conducted in Bartın province. The least squares method was used for determining the effect of environmental factors, and Tukey multiple comparison tests were used for multiple comparison. Mean and standard deviations relevant to the LL, LMY, and CI were detected as 260.26 ± 1.33 days, 1035.5 ± 8.21 kg, and 426.35 ± 2.91 days, respectively. County, calving year, and season, age, and lactation number's effects on those parameters were investigated. The effect of calving year (P<0.001) county and season (P<0.01) on LL; county, calving year (P<0.001) and calving age (P<0.05) on LMY; lactation number (P<0.001) and calving age (P<0.01) and season (P<0.05) on CI were found statistically significant. Meanwhile, a highly significant positive phenotypic correlation was calculated between LMY and LL (r = 0.66, P <0.001). There are no adequate studies related to the environmental factors influencing lactation length, lactation milk yield, calving intervals of Anatolian buffaloes. Significant environmental factors detected in this study should be considered in selection programs.

The aim of this study was to investigate the effects of some environmental factors like calving year, season, buffalo cow age and village on some milk yield traits of Anatolian buffaloes, such as daily milk yield for lactation length (MYLL), total lactation milk yield (TLMY), lactation length (LL), and daily milk yield for calving interval (MYCI). 1838 milk yield records obtained from 851 Anatolian buffaloes reared under different environmental conditions from 2015 through 2019 within the scope of the Bartın Anatolian Buffalo Breeding Project were assessed. The 2 least square means and standard errors for MYLL, TLMY, LL, and MYCI were 4.07  0.02 kg, 1078.6  7.54 kg, 263.83  1.16 days, and 2.75  0.03 kg, respectively. As a result of the study, the effects of village, calving year and age (P<0.001) and calving season (P<0.05) on MYLL; village, calving year and age (P<0.001) on TLMY; village, calving year and age (P<0.001) and calving season (P<0.05) on MYCI; calving age, village (P<0.001) and calving year (P<0.05) on LL were found statistically significant.Moreover, high positive phenotypic correlations between TLMY and MYLL (r = 0.78, P<0.001) and LL and TLMY (r = 0.67, P<0.001) were estimated. The results revealed that milk production traits might be improved by considering calving season and age in breeding studies and stud-selection programs in Anatolian buffaloes. Besides, it will remarkably contribute to the number of limited studies that have focused on this breed.