It provides 100% hydroxy-selenomethionine (OH-SeMet), helping build selenium reserves that support antioxidant defence, immune function, reproduction and animal performance.
Agvance is the exclusive New Zealand supplier of Selisseo®.
Talk to your local Agvance Consultant
Selisseo® has been studied across a range of ruminant production systems and compared with sodium selenite and other selenium sources.
Talk to your local Agvance Consultant
Not all selenium sources are used by the animal in the same way.
Selisseo® – Organic Selenium supplies selenium as hydroxy-selenomethionine. Once absorbed, it can be used to produce selenoproteins or stored in body tissues for later use.
Research has found higher selenium concentrations in plasma, milk, colostrum and body tissues with hydroxy-selenomethionine compared with sodium selenite.
This stored selenium can be particularly useful when demand increases.
Calving, early lactation and heat stress can all increase oxidative stress.
Research in dairy cows has linked hydroxy-selenomethionine supplementation with higher selenium concentrations in plasma and milk and improvements in antioxidant measures.
Under controlled heat-stress conditions, cows receiving hydroxy-selenomethionine also maintained antioxidant activity and tended to produce more milk than cows receiving sodium selenite.
Selisseo® can also be used across beef, sheep and goat systems.
In beef cattle, research has reported higher blood and meat selenium concentrations and differences in meat-quality measures.
In sheep and goats, selenium supplementation can be particularly relevant where animals are grazing selenium-deficient soils. Research has reported greater selenium transfer into milk, colostrum and newborn animals with hydroxy-selenomethionine compared with sodium selenite.
Call 0800 BALANCE or contact your local Agvance Consultant to find out how Selisseo® – Organic Selenium can fit into your mineral programme.
These studies examine hydroxy-selenomethionine, the organic selenium form supplied by Selisseo, across dairy cattle, beef cattle and lambs. Study design, selenium dose, livestock class and measured outcomes differ between trials.
Research on hydroxy-selenomethionine supplementation in lactating dairy cows, pregnant dairy heifers, beef cattle and lambs. Studies compared hydroxy-selenomethionine with inorganic sodium selenite, selenium yeast or unsupplemented diets, including research conducted during heat stress, late pregnancy and the beef finishing period.
Selenium concentrations in plasma, serum, milk, calves and meat, glutathione peroxidase and other antioxidant measures, milk production, oxidative-stress responses, calf selenium status and meat-quality measures including drip loss, lipid oxidation, tenderness and colour.
Publisher page: https://www.sciencedirect.com/science/article/pii/S0022030217308925
Publisher page: https://www.journalofdairyscience.org/article/S0022-0302%2818%2930979-2/fulltext
Publisher page: https://www.journalofdairyscience.org/article/S0022-0302%2819%2930460-6/fulltext
Publisher page: https://www.mdpi.com/2076-3921/9/12/1298
Publisher page: https://www.mdpi.com/2076-3921/10/4/596
The research provides direct evidence for hydroxy-selenomethionine across several ruminant production systems, but results from one livestock class or production stage should not automatically be applied to another.
A. Selisseo® is an organic selenium source containing hydroxy-selenomethionine. It supplies selenium in a form that can be used immediately or stored in body tissues for later use.
A. Sodium selenite is an inorganic selenium source. Selisseo® supplies hydroxy-selenomethionine, which research has shown can produce higher selenium concentrations in plasma, milk and body tissues.
A. Research in lactating dairy cows found that hydroxy-selenomethionine supported selenium and antioxidant status during heat stress. Cows receiving it also tended to maintain higher milk production than cows receiving sodium selenite.
A. Selenium demand can become more relevant around calving, early lactation and periods of environmental stress. Adequate selenium supports antioxidant and immune function during these periods.
A. Selisseo® should form part of the herd’s wider mineral programme. The right inclusion rate depends on dietary selenium supply and the needs of the herd. Your Agvance Consultant can help set an appropriate programme.
Call 0800 BALANCE or contact your local Agvance Consultant to discuss Selisseo® – Organic Selenium and give the right selenium to your animals.


