Bagasse Complete Rations Employing Urea or Urea Plus Fishmeal as Supplemental Nitrogen Sources

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Abstract
Eighteen Brown Swiss and Holstein cows were in a replicated experiment involving preliminary, adjustment, and comparison periods of 35, 7 and 105 days to compare three complete rations containing 25% bagasse and 75% concentrates. The nitro- gen supplement contained urea and tuna- fish meal in the following respective pro- portions: Ration U2, 1~ and :(/2 (15.9% crude protein); Ration U3, 3~ and 1~ (15.9% crude protein); and Ration U4, 1 and 0 ()6.8% crude protein). The ra- tions were group-fed at nearly ad )ibitum intake. Daily feed consumptions per head dur- ing the comparison averaged 22.39, 19.98 and 17.10 kg for Rations U2, U3 and U4. The corresponding urea consumptions were 336, 450 and 513 g. Daily fat corrected milk productions were 21.97, 19.65 and )8.07 kg, Ration U2 being superior to U4 (P < .05). Milk solids-not-fat and pro- tein contents decreased as urea increased. Higher urea was also associated with slightly higher ratios of ration crude pro- tein to milk protein (4.44 to 4.74), slightly lower ratios of ration dry matter to fat- corrected milk (0.895 to 0.828), and less daily gain in shrunk liveweight (0.40 to

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