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Early selection of dairy cows. VI. Effect of 1st lactation yield and age at 1st calving on yields in later lactations in different groups of cows



Early selection of dairy cows. VI. Effect of 1st lactation yield and age at 1st calving on yields in later lactations in different groups of cows



Pol' nohospodarstvo 18(4): 345-353



Further calculations of results up to the age of 72 months were carried out for the 2 groups described in parts IV and V restricted to cows for which full details of yield and age were known (27 cows in group (i) and 45 in group (ii)). A negative correlation between 1st lactation yield and total yield up to 72 months of age was found for cows of group (i) with 1st lactation yields of less than or equal to 2600 kg. In group (ii), the correlation was positive.

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