ISSUE FOCUS 52 FEED & ADDITIVE MAGAZINE July 2025 Heat stress can alter estrus duration, uterine function, endocrine status, and follicular growth and development. Prolonged heat stress may also affect early embryonic development and survival, fetal growth, and colostrum quality. In addition, conception rates in dairy cows are negatively affected by extended periods of heat stress, resulting in longer calving intervals. Conception rates in high yielding dairy cows have been declining—often attributed to physiological changes, management changes and increased milk production. However, during periods of heat stress, conception rates decrease even further compared to periods without heat stress. One study found up to a 23% decrease in conception rate for heat stressed cows compared to non-heat stressed cows, and another found that body temperatures > 39.1° C caused conception rates to drop from 21% to 15%. Finally, a third study found that exposure to heat stress 3 weeks prior to artificial insemination can negatively affect conception rates. Only in the TNZ can dairy cows reach their full genetic potential at the lowest physiological cost and highest productivity. COUNTERACTING THE EFFECTS OF A COW’S KRYPTONITE There are several different approaches to significantly reduce the pressure of heat stress on cows. They all have the same goal: How can I get my herd to suffer fewer losses and less health stress during hot periods? These approaches range from housing conditions, such as the correct placement, orientation, and strength of fans and spray systems, to management with adapted feeding times, to our specialty: Feed technology. We are researching innovative approaches, including the use of phytogenic additives, to support the cow’s natural metabolic processes and sustainably reduce heat stress. Our results so far are very promising—stay tuned for this exciting new solution. Let’s take on this challenge together! About Dr. Melinda Culver A veterinarian with a strong interest in animal health and nutrition, Dr. Melinda Culver earned her Doctor of Veterinary Medicine degree in 2004. She pursued a Ph.D. in Animal Science at Washington State University (2006), focusing on muscle and fat cell development. Dr. Culver transitioned from veterinary practice to the supplement industry, where she’s spent over 15 years using her knowledge to improve animal and human well-being through advancements in nutrition. She joined Biochem in 2022, bringing her extensive experience to the team. Photo: Freepik
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