SPRING SUMMER BONUS MAGAZINE 2026

replacement rates. Many of these losses are not immediately visible as disease, but rather appear as reduced efficiency and profitability over time. The dry period should not be viewed as a resting phase, but as a metabolic reset window where the rumen, liver, endocrine system, immune system, and mammary gland prepare for the demands of the next lactation. One of the strongest predictors of success is maintaining adequate dry matter intake (DMI), with well-managed cows typically consuming at least 11 to 12 kg of dry matter per day. If intake declines during the dry period, it often remains suppressed after calving, increasing the risk of negative energy balance, ketosis, fatty liver, reduced milk production, and poorer fertility. Water intake is equally important, as even mild restrictions can reduce feed intake, rumen function, and nutrient utilisation. Cows entering the dry period in poor condition also tend to have reduced immune responsiveness, increasing their susceptibility to diseases such as mastitis and metritis after calving. Hoof health further influences transition success, as lameness reduces feed access and intake, making preventative claw trimming during late lactation a valuable management practice before the metabolic demands of early lactation begin. When cows become too fat or too thin Over-conditioned cows Over-conditioned cows at dry-off represent a high-risk metabolic group. These cows typically reduce feed intake 2–3 weeks before calving, resulting in a severe energy shortage as calving approaches. To compensate, they begin drawing heavily on their body fat reserves to meet their energy needs. This places strain on the liver, weakens the immune system, and increases the risk of metabolic disorders such as ketosis and fatty liver. The resulting metabolic imbalance can also increase the incidence of milk fever, retained placenta, and reduced fertility, often leading to delayed rebreeding and poorer overall performance during the next lactation. A further hidden cost is reduced immune resilience, which increases susceptibility to mastitis and uterine infections during early lactation. Under-conditioned cows Under-conditioned cows face the opposite challenge. With insufficient energy reserves, they are unable to support peak lactation demands and often fail to express their full genetic potential. This commonly results in delayed ovarian cyclicity, poor conception rates, extended days open, and increased disease susceptibility. Low Body Condition Score (BCS) delays ovulation and impairs follicular development. Importantly, the follicles responsible for early conception are formed 60–80 days before ovulation, meaning metabolic stress during this period directly compromises future fertility outcomes. After calving, restoring body condition is inefficient because most dietary energy is used for milk production rather than for rebuilding body reserves. Optimising cow condition before dry-off Effective transition management starts in late lactation, when BCS can still be corrected before dry-off. Thin cows should regain condition gradually, while over-conditioned cows must be prevented from gaining further fat. In the final 10–14 days before dry-off, concentrate should be reduced and roughage increased to stabilise the rumen and lower milk yield. Grouping is critical. A single-group system leads to inconsistent conditions at dry-off. Thin cows need higher-quality, energy-dense forage, while over-conditioned cows require controlled-energy, high-fibre diets. How De Heus technical advisors add value Successful transition management requires consistent monitoring and timely intervention. Technical advisors support farmers by: • Monitoring and targeting optimal dry-off BCS (3,0–3,5) • Identifying thin and over-conditioned cows early • Grouping cows by condition and production stage • Adjusting rations using feed efficiency (FE) • Supporting DCAB strategies to reduce milk fever risk • Implementing transition programmes like our Prelacto Concept • Monitoring locomotion and hoof health • Improving DMI and rumen adaptation during transition The objective is consistent: healthier cows that calve smoothly, peak efficiently, conceive earlier, and remain productive for longer. Spring/Summer 2026 BONUS www.agribonus.co.za 42