Estimation of lactation yield from incomplete lactation records

Abstract

For estimating the lactation Yield of cattle and buffaloes daily milk is recorded at systematic time intervals during the entire lactation period for a sample of selected animals. But due to several reasons it may not be always possible to obtain milk records at every time interval for all the selected animals. In the present investigation two alternative estimators of average lactation yield under village conditions have been suggested. The first estimator is based on daily milk records of animals having complete lactation data using appropriate probabilities of obtaining the complete records and the second one makes use of the records of all the selected animals, having complete as well as incomplete lactation records.