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Screening for Physiological Traits

Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada

ABSTRACT

Introduction

The word screening in the title assigned to my topic suggests that animal breeders are prepared to accept slightly lowered selection intensity on pedigree potential for milk yield or pay a higher price to sample young dairy bulls with additional genetic potential for other traits, or guaranteed extra potential for milk, or both. The screening process should be prior to the major investment of test mating to obtain progeny information for milk. I shall attempt to deal with the relevance of tests prior to purchase or at least in advance of sampling young bulls. Use of the adjective, physiological, suggests that the traits to be considered ought to be associated with functions of the animal and measurements ought to be objective. These measurements should relate directly or indirectly to the process of getting cows in calf or transmitting high milk yield. These are the two most important things a young dairy bull can do.