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Objective of this study was to calculate the variability and heritability of  type traits in the nucleus herd of bull dams by using the linear method of  evaluation, and to determine their importance in selection of cattle. Study  included 127 Holstein-Friesian cows selected as bull dams on cattle farms of  PKB Korporacija, Belgrade. By applying the Least square method, main  variationstatistical parameters were calculated: arithmeitc mean, standard  deviation, variation coefficient, standard error and variation range. Bull  dams of Holstein- Friesian breed had average milk production of 10245.98 kg,  with variation range from 6514 kg to 13251 kg. Average milk fat yield was  361.95 kg, and milk fat content 3,53%. Average values for type scores of  Holstein-Friesian bull dams were: rump height 5.40, chest width 7.09, body  depth 7.38, rump position 5.39, rump width 6.55, dairy form 7.35, rear legs  set (rear view) 5.22, rear legs set (side view) 5.28, hoof angle 5.27, fore  udder 6.65, front teats placement 5.43, teat length 4.76, udder depth 6.96,  rear udder height 7.13, suspensory ligament 7.08 and rear teats placement  5.89. Also, heritability coefficients and errors were calculated for all milk  and type traits. Type and body development scores are very important  indicators of production ability of cows, their potential to consume  sufficient quantities of food, produce high quality milk from the  technological aspect, reduce the use of energy in production and remain as  long as possible in exploitation.

Variability and heritability of type traits of Holstein-Friesian bull dams