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Irish dairy farmers are being urged to balance beef genetics, replacement needs and calving targets before ending AI breeding programs.
As the June Bank Holiday approaches, many dairy farmers are preparing to scale back or end their artificial insemination (AI) programs and allow stock bulls to finish the breeding season. However, advisers are warning producers not to switch too quickly to dairy-beef genetics without first securing enough dairy replacement heifers for future herd needs. The widespread use of sexed semen in recent years has already tightened replacement heifer supply across many dairy systems.
Strong prices for dairy-beef calves have encouraged farmers to maximize beef-sired calf production, but the market for quality dairy replacements has also remained firm. Analysts suggest breeding a few extra contingency heifers this season could protect farms against future shortages and help maintain sustainable replacement rates. Farmers who still need additional replacements are being advised to act immediately, as late-calving heifers can create long-term production and management challenges.
The article highlights that every dairy operation requires its own tailored cut-off point for dairy AI, depending on factors such as soil type, grazing conditions and calving structure. Farms on heavier soils may prefer a later calving pattern, while free-draining operations often target tighter, earlier spring calving. Producers are being encouraged to strike a balance, since calving too early raises feed costs, while calving too late reduces overall milk production efficiency.
With an average gestation length of 283 days, the timing of AI serves directly determines next season’s calving profile. Industry guidance suggests replacement heifers should ideally calve within the first three weeks of the calving season. For most farms, dairy AI cut-off dates should fall within the first half of June, while the broader breeding season should conclude between July 1 and July 15 to avoid excessive numbers of late-calving cows.
Bull management also remains critical during the final stages of breeding. A mature stock bull can generally cover around 30 cows within three weeks, while younger bulls are more suited to smaller groups of heifers. Farmers are advised to maintain additional bull capacity or continue AI support where repeat heats occur in concentrated periods. Synchronization programs, meanwhile, often require AI during the first repeat cycle to avoid overworking bulls and compromising conception rates.
Source: Agriland – When will farmers be finishing up with AI?
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