diff --git a/share/Models/version6/Livestock/DairyCow/Excretion.nhd b/share/Models/version6/Livestock/DairyCow/Excretion.nhd
index fe5b4352..e31bd628 100644
--- a/share/Models/version6/Livestock/DairyCow/Excretion.nhd
+++ b/share/Models/version6/Livestock/DairyCow/Excretion.nhd
@@ -172,6 +172,7 @@ Richner, W., Flisch, R., Mayer, J., Schlegel, P., Zähner, M., Menzi, H., 2017.
 ?endif
 
 ### just for testing hidden inputs
+?if TESTING
 +hiddenAnimals
   type = float
   hidden = true
@@ -185,6 +186,7 @@ Richner, W., Flisch, R., Mayer, J., Schlegel, P., Zähner, M., Menzi, H., 2017.
     en = -
   ++description
     Just for testing.
+?endif
 
 *** technical ***