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Use of Test-Day Milk Yield for Genetic Evaluation in Dairy Cattle: A Review

G. Bilal and M. S. Khan1

University College of Veterinary and Animal Sciences, Islamia University of Bahawalpur;
1Department of Animal Breeding and Genetics, University of Agriculture, Faisalabad, Pakistan


    The use of appropriate method for genetic evaluation of dairy animals is an important aspect of dairy cattle production. Traditional 305-day lactation model does not account for the changes in environmental factors within 305-day lactation and may involve unjustified projection of incomplete lactations. The use of test-day model in the recent past has made it possible to economize the genetic evaluation with a better accuracy. This paper reviews the recent developments in genetic evaluation of dairy cattle in the developed production set ups and explores the possibility of using test-day model for genetic evaluation of dairy cattle in Pakistan. Different options within test-model approach are also discussed. This is expected to provide food for thought in place in countries like Pakistan where production recording and genetic evaluation systems are getting.

Key words: Test-day milk yield, genetic evaluation, dairy cattle, test-day model.


ISSN 0253-8318 (Print)
ISSN 2074-7764 (Online)