[Total protein, sulfur and bound amino acid content in the hoof horn of cows].

Comparative investigations were carried out for the evaluation of the total protein and sulfur in the sole hoof horn of cows of the breeds Bulgarian Brown and Black and White with normal and diseased hooves as well as of the bound amino acids in the hoof horn of the same hooves of cows of the Black and White breed. It was found that the total protein as indicated above did not show any essential differences in the two breeds. The amount of total sulfur in Bulgarian Brown cows was relatively higher than that in Black and White cows. It was also found that the lower content of sulfur in the diseased hooves indicated lower resistance. The content of bound amino acids in the hoof horn of Black and White cows with both normal and diseased hooves showed certain variations. Generally, it proved lower in diseased hooves of the hind limbs than in affected hooves of the forelimbs.