Higher availability as a condition for economic yield
Low reactivity and subsequent high availability are important high-quality characteristics of hydroxy Cu, Zn, and Mn. As a result, in various animal trials, both under practical and controlled conditions, hydroxy trace minerals show higher rumen fermentation, dry matter digestibility, milk production, and (claw) health. Replacing sulphates, oxides, and chelates with hydroxy trace minerals has also shown improved fertility. This has been expressed as a higher percentage of successfully inseminated cows at first service, reduced interval calving/successful insemination, and lower percentage of cows needing more than three inseminations. These fertility improvements result in an important cost saving for the farmer.
Stressful periods (e.g., periparturient period, heat, weaning) are plentiful during life and always correlated with an increase in oxidative stress. To combat this stress, the animal needs high bioavailable Se. The periparturient period presents a big challenge to ruminants as they transition from late gestation to early lactation. The calving process and the increased metabolic activity and energy demand that marks this period, are linked to a high increase in oxidative stress. In literature, it is seen that supplementation of organic Se to Se-adequate cows during late gestation improves antioxidant function in early lactation. This leads to effective attenuation of oxidative stress. Plasma malondialdehyde, which is a biomarker for lipid peroxidation, and reactive oxygen species levels are lowered significantly postpartum with organic Se supplementation. The plasma total antioxidant capacity (T-AOC) is also significantly improved. These results show that storable Se has a big positive impact during stressful periods. Positive effects for organic Se are also seen for the immune system (e.g., neutrophils). This effect is beneficial in improving the mammary gland health, where the primary defense mechanism is the phagocytic activity of neutrophils and lowering the somatic cell count.
Birth to weaning also presents a huge challenge for calves and stress reduction is key. To enhance the Se status of calves during the first weeks, Se transfer from cows to their offspring via colostrum/milk is essential. When the effect of supplementation of different sources of Se on the Se concentrations in milk from dairy cattle was investigated, L-selenomethionine increased the milk Se level to the highest extend throughout the whole trial period (Vandaele et al., 2014).
To supplement feed with trace elements, it is important to choose a high-quality trace mineral source to guarantee the best supply of these essential nutrients to the animal. Hydroxy trace minerals and L-selenomethionine (Excential Smart & Excential Selenium 4000, Orffa Additives BV, The Netherlands), with no impact on rumen functioning, provide your animals with these nutrients in a safe and optimal way.