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Effects of Buffers on Ruminal Rate of Passage and Degradation of Soybean Meal in Steers¹

University of Guelph, Guelph, Ontario, NIG 2W1

³ Dept. of Anim. and Poul. Sci. Please direct reprint requests to J. G. Buchanan-Smith.

Abstract

Eight rumen-fistulated steers were randomly assigned to medium- and high-concentrate diets supplemented with 0, .75, 2.5 and 5% of either sodium bicarbonate or an artificial saliva salts mixture. Each animal was fed for 21 d at 75 g dry matter/kg body weight^.75. Rates of soybean meal (SBM) degradation were predicted by adjusting digestion rates in nylon bags with respective passage rates of chromium-mordanted SBM particles. Measures of rumen fermentation were made during the incubation period. Liquid dilution rate was determined with ⁵¹Cr-EDTA. The high-concentrate diet produced higher (P<.05) liquid dilution rates than the medium-concentrate diet, but there were no differences in response to the two buffers (P>.05). The liquid dilution rates averaged across diets for 0, .75, 2.5 and 5% levels of buffer were 6.2, 6.3, 8.5 and 8.7%/h (SE = .03) and passage rates for SBM were 5.2, 5.2, 6.5 and 6.7%/h (SE = .025). The 2.5 and 5% levels of buffer increased the rate of disappearance of SBM from the nylon bags and buffers fed at these levels also increased rumen pH and NH₃-N concentration. Rumen pH was correlated with N disappearance from the nylon bag (r = .903, P<.05). Buffer levels did not affect degradation rates of SBM.

¹ This research was supported by the Natl. Sci. and Engin. Council of Canada grant A 5934 and the Ontario Ministry of Agr. and Food. We are grateful to Y. T. Yao for technical assistance and to Dr. F. D. Horney for surgically preparing the animals.

² Present address: Dept. of Anim. Sci., Univ. of Nigeria, Nsukka.

⁴ Dept. of Biomed. Sci.

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