The periparturient period is a crucial Window of Impact. At this stage the dairy industry’s drive to maximise output undoubtedly increases the risk of suboptimal health, production and fertility. This results in extended calving intervals and increased culling rates, reducing the average age of the herd and subsequent production potential. The Anupro Dairy-Catalyst programme addresses these needs to deliver optimal health and fertility whilst achieving high levels of production. The Anupro Dairy-Catalyst Programme deliberately focuses on the physiological needs of the cow at a detailed level. We have developed very specific techniques and nutritional synergies to optimise each critical time point; Window of Impact, during the pre- and post-calving period, with each acting as a catalyst for the next. The programmes embrace a precise approach to optimise cell and system recovery, cell metabolism, liver function and rumen transition to deliver optimal production, fertility and longevity. Our focus on preparing the cow pre-calving, and recovery post-calving, delivers a simultaneous increase in milk yield and energy intake to alleviate negative energy balance and metabolic stress. The rapid acceleration in dry matter intake and subsequent absorption and metabolic capacity allows the cow to quickly address all metabolic needs effectively to optimise production, health and fertility. This approach eliminates metabolic imbalances caused by nutritional stress, such as ketosis, fatty liver syndrome and severe negative energy balance, all of which have a dramatic impact the productive and reproductive capacity of the cow.