The critical spring mating period is under way on most of the country's dairy farms, but heavy rain, slips and floodwaters have closed key roads in the South Island, making it difficult to reach a number of flood-hit farms and get cows in-calf.
Despite the tough conditions, agritech and herd improvement co-operative LIC says it is using small planes and helicopters to make sure semen straws are still delivered to farmers on time.
National Artificial Breeding Manager David Hale said the co-op understood the importance of delivering semen to all farms on schedule, regardless of weather conditions.
"The dairy cow cycle takes roughly between 18-24 days. If insemination doesn't occur at the right time during that cycle, it means a three week wait until the cow is in heat again.
"This three week loss can have a number of negative flow-on effects for farmers, including the potential loss of three weeks' worth of milk supply and an impact on calving periods the following year".