Proximity sensors provide an accurate alternative for measuring maternal pedigree of lambs in Australian sheep flocks under commercial conditions

Context Proximity sensors were used recently to determine the maternal pedigree of lambs on a small plot with high accuracy. If this accuracy is maintained under commercial grazing conditions, method could be useful alternative improving genetic gain in sheep, including reproduction traits. Aims To investigate using proximity and define level interactions required confidently irrespective differences ewe age, lamb birth type, paddock size, flock size or stocking rate conditions. Methods We compared determined DNA profiling (n = 10 flocks) lambing rounds 16 flocks). Ewes 7315) 8058) fitted normal conditions for each property 1–3 days. Flocks varied age (adults, hoggets lambs), (up 100 days old, except 1 flock), type (singles, multiples), (0.25–320 ha), (37–420 lambs) (2–100 dry sheep equivalents/ha, flock). Key results An interaction ratio >2 was confident ewe–lamb match (ewe most second-most lamb). Using criterion, average success at matching 95% 97% accurate when from DNA. For matched successfully, over 90% achieved first 7 h 99% 20 h. While not influenced significantly by rate, time achieve sensor quicker singles than twins higher smaller paddocks rates. Conclusions Our showed that can establish effectively accurately across range experienced properties. Implications Private industry now develop more cost-effective technologies greater confidence will enhance recording and, hence, industry.