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How To Work Out Reproduction Parameters

Farmer's Weekly

May 25, 2018

Recording the reproduction of your ewe flocks during each breeding season will help you identify potential fertility problems.

Reproduction is key to survival in all livestock farming enterprises. It’s therefore important to measure the reproduction of ewe flocks during each breeding season. This will help you identify ewe and sire fertility problems early.

CONCEPTION RATE AND SCANNING PERCENTAGE

Both the conception rate at scanning (CRS), or number of ewes that were scanned in lamb, and the scanning percentage (SP), which is the number of scanned foetuses, are expressed relative to the number of ewes mated. They can only be calculated if producers scan their ewes for gestation about six weeks after the end of the mating season.

CRS cannot be above 100%; SP can range from below to above 100%, depending on the number of foetuses. These are the first measurements that will indicate the success or failure of a breeding season:

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