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A COMPARISON OF BIMONTHLY AND QUARTERLY TESTING WITH MONTHLY TESTING FOR ESTIMATING DAIRY CATTLE PRODUCTION 1

By N. D. Bayley, M. Liss and J. E. Stallard

Abstract

One method of effecting economies in production testing of dairy cattle involves increasing the interval between tests. Several studies have been pub-lished concerning the amount and importance of the accuracy lost when this interval is lengthened. At least seven investigators have reported the accuracy of lactation records computed from monthly butterfat tests and milk weights as compared with an accuracy from daily measures (2, 5, 6, 7, 8, 11, 12). Their results indicate an average deviation of the monthly records from the daily records of about-+-2 per cent for milk yield and ± 3 per cent for fat yield. McCarthy and Boyle (7) reported that 95 out of 100 of the errors they observed in monthly milk records were between + 6.16 and- 5.35 per cent. Campbell (2) found that 86 out of 100 errors regarding milk yield were less than ± 5 per cent. Seventy-six out of 100 errors in fat records were within + 5 per cent in his data. Comparisons concerned with the accuracy of computing lactation records from weights taken every 2 too. have indicated that bimonthly milk yield records var

Year: 2008
OAI identifier: oai:CiteSeerX.psu:10.1.1.128.4446
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