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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1995;8(1): 75-82.
https://doi.org/10.5713/ajas.1995.75    Published online February 1, 1995.
Ruminal and post-ruminal digestion and nitrogen balance in early weaned calves fed soybean meal and heated soybean meal
T. Obitsu, T. Morooka, M. Okubo, Y. Asahida
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 0.5kg. 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 0.7kg/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 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

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