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Use of Bimonthly Records in Herd Testing

New Zealand Dairy Board, Wellington, New Zealand

ABSTRACT

Records calculated from herd-testing figures obtained in alternate months (bimonthly records) were compared with those calculated from monthly herd testing, in a study involving 35 herds. Comparison of herd averages, within-herd ranking of cows, and repeatability of records under the two systems indicated that bimonthly records are suitable for within-herd comparisons but not for between-herd comparisons. The within-herd ranking of cows was almost identical and the repeatability of the bimonthly records was only 0.04 lower than that of the monthly records. Sire proofs calculated from the two sets of records in these herds ranked the bulls similarly.