Variation in Milk Production of Brown Swiss Cows By Calving Season, Stage of Lactation and Year

Abstract

The objective of the present investigation was to determine the change of milk production by calving season, stage of lactation and year in Brown Swiss cows. The research was carried out on Brown Swiss cows (n=30) reared at a private farm in Konya region of Turkey. Daily milk yield (DMY) values of the current lactation and lactation milk yield (LMY) values of initial two years ( 2015 and 2016) were assessed to be milk production parameters. To evaluate DMY, two stage of lactation (SL; 1=<157d and 2=>= 157d) and calving season (CS; 1=from March to August and 2=from September to February) groups were designed. Group differences were tested by independent-samples t-test in SPSS. DMY means for SL1, SL2, CS1 and CS2 were calculated to be 20.25 kg, 17.79 kg, 17.85 kg and 19.69 kg, respectively. LMY means of two years were estimated to be 4975.53 kg and 5961.80 kg, respectively (P<0.001). It was concluded that milk yield level was positively affected by years in the evaluated dairy farm.