Long Scanning Calculator

Short Scanning

Tally Percentage

Long Scanning

Full Scan

Scanning percentages for ewes can be recorded in two different ways, Short Scanning or Long Scanning.

If you only have a short scanning percentage, the Short to Long Scan calculator can be used to calculate a theoretical long scanning figure based on your short scanning figures. While this will not be as accurate as a physical long scan, it will give a very good indication of what an equivalent long scan % would be.

Note. This calculator is based on theoretical numbers. Where your short scanning multiple % is a very high proportion of your flock, the calculated long scanning % can become unrealistic.

Short Scanning

Ewes are scanned, and results recorded as: dries, singles, multiples (where multiples are all treated as being twins)

Example: 50(8%) dries + 100(15%) singles + 500(77%) multiples
= 1,100 potential lambs (169%)

Short scanning is less accurate and, in all probability, is likely to underestimate the true scanning %.

Long Scanning

Ewes are scanned, and results are recorded as dries, singles, twins, triplets, quads

Example: 50(8%) dries + 100(15%) singles + 500 multiples - made up of 702(54%) twins + 429(22%) triplets + 24(1%) quads
= 1,255 potential lambs (193%)

Using long scanning percentages when calculating on farm performance will provide a more accurate measure of true performance.