In 1969, the test interval method became the accepted procedure in the United States for estimating lactation yield from test day data. Daily yields from 658 Canadian Holsteins and information on US testing frequencies were used to determine if a best prediction method could estimate lactation yield more accurately than the currently used test interval method. For the traditional environment of near monthly tests, little difference was found between the two procedures in their accuracy of estimating actual milk produced. To determine if a change in estimation procedures is warranted, estimates from these methods should be compared for testing environments in which weights and samples are recorded at varying intervals and frequencies.

H. D Norman, J. R Wright, J. S Clay

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 343–346, 1998
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