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RUMINAL AND POST-RUMINAL DIGESTlON AND NITROGEN BALANCE IN EARLY WEANED CALVES FED SOYBEAN MEAL AND HEATED SOYBEAN MEAL

  • Obitsu, T. (Faculty of Applied Biological Science, Hiroshima University) ;
  • Morooka, T. (Faculty of Agriculture, Hokkaido University) ;
  • Okubo, M. (Faculty of Agriculture, Hokkaido University) ;
  • Asahida, Y. (Faculty of Agriculture, Hokkaido University)
  • Received : 1994.04.16
  • Accepted : 1994.09.26
  • Published : 1995.02.01

Abstract

Two digestion trials were conducted to investigate the effect of feeding heated soybean meal (HSBM) on ruminal and post-ruminal digestion of organic matter (OM) and nitrogen (N), bacterial N flow to the duodenum and N balance in young calves weaned at 6 weeks of age. In trial 1, calves were fed concentrate diets containing soybean meal (SBM) or HSBM and hay mixed in the ratio of 6:4 to support daily weight gain of 0.5 kg. The same concentrate diets were used in trial 2, but the ratio of concentrate to hay was 7:3 to support body weight gain of 0.7 kg/d. Measurements were made 10 and 13 weeks of age in trial 1, and at 10 and 15 weeks in trial 2. Ruminal OM digestibility increased with advancing age in both trials. Ruminal OM digestion was not affected by the diets in trial 1, but it was greater for the SBM diet than for the HSBM diet at 10 weeks in trial 2. Net N loss from the rumen was lover for the HSBM diet than for the SBM diet in trial 1, but it was not affected by the diets in trial 2. Bacterial N flow to the duodenum, N digestion in the total digestive tract and N retention were not affected by the diets in either of the trials.

Keywords

Degradability;Soybean Meal;Bacterial Nitrogen;Calves