This study aimed to determine the factors affecting the colostrum quality in dairy farms located in the Menemen district of İzmir province. A total of 61 colostrum samples were collected in the first 6 hours after birth from six dairy farms having more than 100 head. The colostrum obtained from each cow was measured for density using a colostrometer. It was found that 40 of the colostrum samples were of good quality, 16 were of medium quality, and 5 were of poor quality. The current study identified a statistically significant effect of herd size (P