Plan now for spring calving success First lactation heifers and high yielding cows can be given a bit of help to get back in calf this autumn by using GnRH. It’s effective when used at insemination, particularly on farms where conception rates are below 40%, as a holding injection. But it also has a key role to play in maintaining a pregnancy when injected at day 11 after service. The only licensed product which does this is Receptal® which helps to boost the signal sent by the embryo to the dam, supports the corpus luteum and maintains a pregnancy. With this year’s weather patterns affecting the amount and quality of grazing on many farms throughout summer, it could be that some high yielding cows have been on poorer diets. As a result, follicle development and quality will be adversely affected which, in turn, will determine whether a cow becomes pregnant or not. Sometimes, the result is smaller follicles, in the worst case scenario, no ovulation, or it may just be that heats are of very low intensity. An injection at service with Receptal, may help to induce ovulation in "delayed ovulation" cases. Where grazing quality is still poor going into autumn, cows will need buffer feeding. The most dietary-challenged cows may also benefit from an injection of Receptal on day 11 following service – on average a 10% boost in pregnancy rate may be achieved. To discuss the possible role of Receptal in your herd further, contact the practice.