16/07/2026
When should you scan your cows for pregnancy diagnosis? π
Most farmers scan once. But when you scan - and whether you scan again - determines how much value you actually get from it. Here are the two scanning windows every dairy and beef farmer should know.
1οΈβ£ FIRST SCAN: FROM 28 DAYS AFTER AI
The earliest reliable window for pregnancy diagnosis. Days 28-32 after AI is the recommended time for accurate ultrasound detection.
What you learn:
β Pregnancy confirmed - definitive yes or no at the cow, no lab wait
β Open cows identified - rebreed sooner, stop wasting resources on empty animals
β Cycle stage assessed - know where non-pregnant cows are in their cycle for precise rebreeding
β Breeding success evaluated - see how your bull or AI programme performed
2οΈβ£ RECHECK: 45+ DAYS
The scan most farmers skip - and the one that catches hidden losses.
5-20% of confirmed pregnancies are lost in the first 60 days. A meta-analysis of 19,723 records found average losses of 13% between days 30-45 and 7% between days 45-60. Without a recheck, those losses go completely undetected.
What the recheck reveals:
β Pregnancy losses caught - cows that lost since first scan, now identified for rebreeding
β Twin detection - twins are more visible now. After 12 weeks, detection becomes difficult
β Foetal viability confirmed - heartbeat confirms pregnancy is alive and developing
β Foetal s*xing possible - determine calf s*x for breeding and marketing decisions
π° EVERY DAY COUNTS
Every empty day costs β¬3.81 per cow (Teagasc). A cow missed for 60 days costs β¬229 in delayed conception alone - plus feed, housing, and β¬1,800 per replacement heifer if culled.
Ultrasound also reveals what milk testing never will: uterine health, ovarian structures, reproductive disorders, and embryo or foetal death. Catching these early means acting before they drain your herd's performance.
π EVERY SCAN GIVES YOU MORE THAN JUST A YES OR NO
Ultrasound goes beyond pregnancy status:
β Uterine assessment - detect fluid or abnormalities affecting fertility before they cost you cycles
β Ovarian structures - follicles, corpus luteum, cysts. Precise AI timing
β Reproductive disorders - catch conditions early before they drain performance
β Embryo/foetal death - detect losses milk testing cannot find. Get the cow back in the programme immediately
π¬ At what day after AI do you normally perform your first pregnancy check? Let us know in the comments.
π www.scaninsights.org