Canadian gilt development standards are well known as having first breeding at 130 to 150 kg of bodyweight at a minimum 210 days of age. Henrik Jensen from Denmark has a different protocol that yields him 30 pigs/sow/year. Part of this protocol has him breeding at 160 kg or more at 270 days or older. For every 10 day increase in age at first conception, there is a result of 0.1 more pigs per litter. There can also be increases in first, second, and older parity sows litters as age of first conception increases. Fewer sows are removed from the herd due to poor farrowing performance or from becoming too large, and there were less repeat breeders. A heavier first litter sow at farrowing is better protected against lower milk production, slower litter growth, and poor subsequent reproductive performance. Some of the drawbacks include producing and weaning few pigs in their lifetime, being removed from the herd sooner, more non-productive days, and the fact that it is not very economical overall to breed this late. It is calculated that a day of 210 to 240 days is efficient. After some research, it is found that 130 to 150 kg and 210 to 240 days of first breeding is adequate. It varies from farm to farm however, so a farm must assess their options carefully before choosing to adopt new protocol.