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The evaluation of productive and reproductive indicators by grazing reared heifers
PALČISKOVÁ, Barbara
On the school farm were selected a total of 33 heifers, 13 heifers, pasture bred heifers and 20 team-bred manner. For these two groups was observed fertility (age at first calving, insemination interval, service period) and milk yield (kg of milk, fat content in%, the amount of fat in kg,% protein content and protein in kg). Age at first calving was bred heifers on pasture lower, because the naturally% higher pregnancy rate than that of insemination. The positive effect of grazing is observed only for insemination interval was shorter in the pasture bred heifers. However, the achieved value of service period was favorable for the stable breeding heifers bred. Milk production (kg) was found higher in cows bred the stable breeding. The same was true even in the amount of fat (kg) and protein (kg), as a result of higher milk production overall. The percentage of fat and protein in milk was found almost no difference. The results come from a small set of heifers and objective assessment would be appropriate to verify this in order to discuss the impact of grazing on production and reproductive performance.
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