[The effects of feeding NaOH treated straw to dairy cows with special reference to the reaction of the kidneys (author's transl)].

Fattening bulls were given alkali-treated straw during 5--7 months. The daily intake of Na was 10 times greater than the requirement. The daily increase in body-weight was very high (1571--1898 g per day). No negative influence on animal health was recorded. The size of the kidneys did not increase, nor were there any histopathological abnormalities which could be attributed to the overfeeding with Na.