Required Levels of Selenium

Se

Dietery levels - DM basis (ng/g)
  • Deficient 

  • Marginal 

  • Adequate 

  • Toxic (cattle)

<50

50-100

100-300*

5000

* NRC standard for dairy cows

 

Natural levels of Se in forages:  20-30ng/g (KZN Midlands).

Whole blood levels-dairy cattle (ng/g)
  • Deficient 

  • Marginal 

  • Adequate 

  • Toxic (cattle)

<100

100-199

200-500

1800

Many herds to this day are still in the deficient - marginal range.