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Sampling Bulls from Planned Matings in Artificial Insemination

Select Sires, Inc., Plain City, OH 43064

ABSTRACT

Introduction

A bull's genetic worth for milk production can be measured only in terms of the progeny he leaves. An indirect measurement such as this may be subject to many different forms of bias. These biases are of varying degrees of complexity; some can be corrected for with relative ease, (i.e., record length); others are difficult (i.e., genetic trend).

Fortunately, from a genetic standpoint the incidence of single-herd proofs being used extensively is becoming less. Even syndicate proofs, where dairymen join together to purchase and progeny test a bull and have vested interest in the bull, are recognized as less than ideal. Because of declining numbers in some breeds, some organizations are forced to use this type of sire proving. However, in the Holstein breed this is the exception.

Most artificial insemination organizations have some form of young sire sampling program through which they hope to obtain at least part of their future proven sire battery.

¹ Address: Curtiss Breeding Service, Cary, IL 60013.