The impact of DNA parentage verification on breeding value estimation and sire ranking in South African Angora goats

Abstract

Pedigree integrity plays a crucial role in the achievement of genetic progress in livestock selection programmes. DNA marker-based parentage testing has become a useful tool for amending inaccuracies in on-farm pedigree records. In the current study, the extent of inaccurate and incomplete pedigree records was quantified in 381 South African Angora goats using a 12 microsatellite markers. Eight half-sib families with a total of 317 Angora kids,40 kids with unknown sires and an additional 16 putative sires were included in the study.14.3% of the on-farm pedigrees were amended, including incorrect (according to the DNA verification) or incomplete records. Estimated breeding values (EBV) for fleece traits (fibre diameter and fleece weight) as well as body weights (birth weight and weaning weight)were calculated for 21 sires using ASREML, firstly for the breeder’s recorded pedigree and secondly for the DNA-verified pedigree. An overall greater effect was observed in bodyweight traits than in fleece weight traits with regard to sire EBVs and the ranking there of. The significant change realised in sire ranking after DNA marker-based pedigree verification emphasises the importance of pedigree integrity in maximising selection accuracy for the production of the highest quality mohair clip in the South African Angora goat industry.