Abstract #T3

# T3
Effect of heifers rearing in early age on their behavior during first lactation.
J. Broucek*1, M. Uhrincat1, P. Kisac1, A. Hanus1, M. Soch2, 1National Agricultural and Food Centre, Research Institute of Animal Production Nitra, Luzianky, Slovakia, 2South Bohemia University, Ceske Budejovice, Czech Republic.

Aim of the study was tested hypotheses that the cow’s behavior is affected by the method of rearing from the second week of life to weaning. Fifty-one Holstein cows were reared in 3 groups from d 7: A, pen with the milk drinking feeder, n = 19; B, hutch, bucket with nipple, n = 19; C, pen with nursing cows, n = 13. After weaning at 8 wks, all heifers were kept in group pens, after parturition in free-stall housing. The learning ability (8 × 14 m closed maze) was tested in mo 4 of first lactation. Cows solved 6 tasks during 3 days. Tasks 1 and 2 required a left-side solution, tasks 3 and 4 a right-side solution, and 5 and 6 a central solution. Each task had 2 runs. The time of standing in maze and speed of traversing the maze were recorded. At 7th month of first lactation, during 3 d (12 tests) the animals were subjected to test in an aversion alley (16.3 m long, 1.86 m wide). There was applied to a positive treatment on d 1 (brushing), a negative treatment on d 2 and 3 (single noise 128 dB.s−1 and electric shock 1.5 kV.s−1). The time of run across the alley was recorded. The data were analyzed using a GLM ANOVA. Group A was the fastest in the first 4 tasks, group B ran through the maze the fastest in the fifth and sixth tasks. The average time of traversing the maze for 6 tasks was the highest in C (170 ± 122 s) and the lowest in A group (108 ± 97 s; P < 0.05). Differences (P < 0.05) at time of standing in maze and a speed of traversing the maze (P < 0.05) were found between groups C and A. We did not find out any significant differences in aversive behavior among groups. After negative treatment on the 2nd day the group B needed longer time to across the aversion alley than groups A and C (67 ± 41 s, 54 ± 31 s, 56 ± 44 s). On third day, the time to across the alley increased in all groups (98 ± 78 s, 98 ± 69 s, 90 ± 88 s). The results show that the method used to rear heifers may have a significant impact on their maze behavior; however, the rearing conditions had little long-term effect on the aversive behavior. This study was possible through projects APVV 15-0060 and QK1910438.

Key Words: dairy cattle, rearing, behavior