Cow fertility is a major problem facing dairy farmers worldwide. Global farmers are reporting problems getting high genetic merit animals back in calf.
New Zealand’s seasonal systems makes it essential that cows get in calf within an eight-week window at the same time every year. Cows that don’t get back in calf, will be culled - as will bulls that sire infertile daughters.
A strictly seasonal calving pattern has ensured the indirect selection for fertility on New Zealand farms for more than 50 years. LIC sired cows have an average calving interval of 370 days, with over 50% of cows calving to first AI service.