A dairy cow eats 20 kg of dry matter from cut corn silage (Mg content 1.2 g/kg DM).
She is fed 5 kg of standard kibbles (DM-90%) with a 5 g/kg DM Magnesium content.
What is the magnesium content in the ration? And is it sufficient?

Total Mg content in 5 kg of kibble = 5 x 90% = 4.5 x 5 = 22.5 g
Total Mg content in ration is thus (24 + 22.5) / (20 + 4.5) = 1.90 g/kg DM
The standard is 2.1–2.4 g/kg DM, depending on production level. Thus, this is insufficient.

a. 1.43 g/kg DM. This is insufficient b. 1.90 g/kg DM. This is insufficient c. 1.96 g/kg DM. This is insufficient d. 4.09 g/kg DM. This is more than sufficient Check Answer Reset