Molybdenum News Center

Molybdenum Toxicity

There has been much recent discussion in the farming press about ‘molybdenum toxicity’ and its role in cattle fertility. Despite the discussion, it is unclear how much of a role molybdenum toxicity actually plays in poor fertility.

There are two types of molybdenum toxicity. The first, which is well recognised, occurs on high molybdenum pastures (often referred to as ‘teart’ pastures) containing around 20 – 100 mg of molybdenum per kg. Within a few days of being placed on such pastures, cattle start scouring and develop stary, harsh coats. This can be effectively prevented by high doses of copper, because it has been demonstrated that such levels of molybdenum affect the absorption and metabolism of copper.

The second type of molybdenum toxicity, which is the type discussed recently in the press, is more controversial. This is the suggestion that at much lower levels of molybdenum (figures??, problems of toxicity can occur even in animals which are being fed more copper than their calculated dietary requirements and have an apparently normal copper status. It is suggested that in adult cattle affected by this version of molybdenum toxicity, the most common problem reported by the farmer is poor fertility. Like teart pasture toxicity, it is suggested that this “low level “ molybdenum toxicity also responds to further copper supplementation.

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