Economic evaluation of productive and reproductive indicators in dairy cows with different ages at first calving, in grazing systems
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Abstract
province, Argentina. Fifty members from each of the following three age groups at first calving were randomly chosen: Group 1: 750 days (24 months), Group 2: 840 days (27 months) and Group 3: 1,098 days (32 months). Group characterization was based on values of the following indicators: total productive life, total milk production, milk index, productive days, number of calvings, production per lactation and mean calving interval. Significant differences between groups (p<0.05) were only
observed for total productive life. Although all three groups produced similar amounts of milk, cows in the late calving age group resulted in higher incomes. It is concluded that indicators calving interval, efficiency in rearing, age at first calving and longevity, all of which are easy to register, acquire relevance when evaluating their impact while modeling the final economic result of the establishment, thus enabling the technical and managerial decision making, aimed to improve system profitability.
Key Words: dairy cows, age at first calving, calving interval, longevity
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