Published online by Cambridge University Press: 20 November 2017
Fishmeal is a suitable protein source for pregnant and lactating ewes, providing higher levels of undegradable protein (UDP) than vegetable protein sources, with an improved biological value (Robinson, 1987). The lower amounts of UDP supplied by vegetable protein sources may however be improved by formaldehyde treatment. The objective of the current experiment was to compare the effects of feeding concentrates containing fishmeal with concentrates containing vegetable protein sources with or without formaldehyde treatment.