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Effect of grazing heifers in the rearing of their performance
KUKLOVÁ, Jana
The aim of this work is to evaluate the course of rearing Red Pied heifers reared with use of graze and stable and review effect of graze use on subsequence performance in 1st lactation. In selected breed was monitored process of heifer grow by periodical weighting in three months interval, furthermore was taken for these heifers these reproduction indices: 1st insemination age, insemination index, 1st calve age. Heifers are divided by rearing form (graze, stable) and compared differences in grow intesities and reproduction efficiency between particular groups. Subsequently, for cows on first lactation were monitored and compared these indices: level of milk performance, content of milk elements, degree of physical condition, indices of fertility. Dairy cows are divided into groups according to how they were reared as heifers (graze, stable). When comparing growth of heifers, grazed heifers reaches higher values than group of not grazed heifers. Grazed heifers grows more quickly: at age 3 months was their average weight 93,26 Kg against 88,30 Kg not grazed heifers. At age 6 months was weight of grazed heifers 169,51 kg against 161,80 kg not grazed heifers, At age 9 months was values 236,47 kg for grazed heifers, 228,07 kg for not grazed heifers, at age 12 months 326,62 kg and 299,87 kg, at age 15 months 366,11 kg and 359,98 kg. From reproduction indices have been found statistically significant differences in age at 1st insemination, when the grazed heifers were flushed in average age of 18,43 months against not grazed heifers in age of 17,12 months. In addition, was found statistically significant differences in age at first calving, when the values obtained for the group of grazed heifers was 28.63 months and for not grazed heifers 27,73 months. First calving heifers reared on graze produce in lactation average 7 782,4 Kg of milk, first calving heifers reared in stable produce in lactation average 7 064,40 Kg of milk. Differences was statistically significant. Average duration of lactation at first calving heifers reared on graze was 359,47 days, duration of lactation at first calving heifers reared in stable was 329,01 days. Differences was statistically highly significant. From the linear description is clear that graze has positive effect on heifers muscling and limbs. In overall assessment made grazed heifers higher rating points 81,43 for heifers reared on graze and 81,00 point for heifers reared in stable. These differences could not be statistically demonstrated.
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