Studies on in vitro degradation and in vivo digestion of a slow ammonia releasing urea product.
a slow ammonia releasing urea product (Uromalt) has been produced by autoclaving and drying of germinated barley and urea. In vitro degradability of nitrogen (IVDN, Raab et al., 1983) was in average 62 +/- 9% in 4 hours, compared to 76 +/- 8% with an autoclaved and dried mixture of urea and not-germinated barley. Mixtures of urea with Leucaena l. or Azadarichta indica (Neem cake) showed degradabilities of about 80 and 93%, respectively, when dried at 39 degrees C, but of 65% when dried at 100 degrees C. For comparison, degradabilities of proteins of ground nut, guar, sunflower, mustard, rape and sesame cake/meal have been determined. When growing lambs were fed a ration containing 15% Uromalt, faecal N-excretion was significantly higher on the expense of urinary N-excretion, compared with groups fed isonitrogenous rations containing soya bean meal with or without urea and molasses. N-retention was not significantly affected. It is concluded that this slow ammonia releasing urea product can be used in cases where molasses or other feedingstuffs rich in rapidly fermentable carbohydrates are not available.
Virk
A S
AS
Institute of Animal Nutrition, University of Hohenheim, Stuttgart.
Steingass
H
H
Menke
K H
KH
D000641:Ammonia / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D002417:Cattle; D005260:Female; D001467:Hordeum; D008297:Male; D009584:Nitrogen / Q000378:metabolism; D012756:Sheep / Q000378:metabolism*; D014508:Urea / Q000378:metabolism*
D000641:Ammonia; D014508:Urea; D009584:Nitrogen