Adipic Acid and Benzoic Acid for Mink in the Growing Period

Urinary infections can be a big problem in mink farms. Especially in June and July, we find infections in the bladders of very fast growing male kits. They eat a lot of feed and thereby have a high excretion of waste products in the urine. Most often the problems stop when we start to use fish silage in the feed. The mineral acids from the fish silage are excreted in the urine, and thereby the urinary pH is lowered, crystals, if any, are dissolved and the growth of bacteria is restrained. I is recommended that the urine pH should be in the range between 6.0 and 6.6 (Case et al, 1995).
From the time when the kits start to eat and until silage is added to the feed, there might be a problem with bladder infections.
Addition of ammonium chloride lowers the urine pH, but using it daily in too high amounts might reduce feed intake (Clausen, 2000).
Adding other kinds of acids that do not influence the taste of the feed in a negative way, could be interesting.
A pilot study in the N-balance stable showed, that addition of adipic acid or benzoic acid might be a possibility (Lisbjerg, 2005).