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The relative accuracy of different sampling procedures for estimating total lactation yield of milk and milk constituents


The relative accuracy of different sampling procedures for estimating total lactation yield of milk and milk constituents



Irish Journal of Agricultural Research 27(1): 31-38



ISSN/ISBN: 0578-7483

The relative accuracy of 15 different methods for estimating total lactation yield of milk and milk constituents were compared using production records from 730 spring calving dairy cows. For each method, total lactation yield to milk and milk constituents were estimated using the centering date method. A linear model was used to analyse the difference between actual and estimated yield for each of the methods compared. Absolute deviations between actual and estimated yields were also calculated. The actual milk yield per cow was estimated from yields recorded on 3-5 days per week. Total lactation yield of milk constituents were estimated from one test day analysis per week. The most accurate method for estimating total lactation yield was based on one day's recording per week. The error increased as the interval between recordings increased. The majority of yields were within 5% of the true yield when recording was frequent. They deviated more with less frequent recordings. The error associated with estimating the totoal yield of milk constituents was greater than that for milk yield for each of the methods compared.

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Accession: 001983204

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