CANADIAN geneticists claim the first 54 Prelude daughters classified were in high type herds, giving an unrepresentative daughter group. And, they say, the average Canadian bull has about 15% of his daughters re-scored for type but 24% of Preludes first daughters were re-scored upwards.
His 1149 new daughters were all in first classifications and scored lower than these original re-scored daughters.
When a new bull has daughters re-scored upwards, he is rewarded when he has more daughters scored upwards than other bulls, say the geneticists. But when Prelude added his second crop daughters the number of re-scored daughters dropped. Also if Preludes mates in the second crop were better than average and re-scored more than average mates the dam effect would reduce Preludes proof, they claim.
Prelude saw his first crop proof climb from +13 to +16 as his daughters were re-scored. If his second crop daughters follow the same pattern as his first, geneticists expect his proof to increase to perhaps +8, which is where his first classification proof pegs him now. To avoid this yo-yo affect, which has happened to other Canadian bulls, such as Astro Jet, all Canadian bulls proofs will be based on the first type classification made on individual daughters – and not reclassifications – as from January 1996 evaluations.