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In Vitro Studies of Dried Alfalfa and Complementary Effects of Dehydrated Alfalfa and Urea in Ruminant Rations^{1 ,2,}

University of Nebraska⁴, Lincoln 68583

Abstract

Alfalfa which was oven-dried at temperatures greater than 60 C produced less (P<.05) ammonia in vitro in 4 hr than soybean meal. Alfalfa which was freeze-dried or oven-dried at temperatures of less than 60 C produced slightly, although not significantly, less ammonia in vitro in 4 hr than soybean meal.

A lamb balance trial was conducted to evaluate dehydrated alfalfa (dehy) or a dehy-urea combination in rations containing 60% wheat straw. Lambs fed urea retained less (P<.05) nitrogen than lambs fed rations that contained soybean meal, dehy-urea or dehy. Lambs fed dehy or dehy-urea retained as much nitrogen as lambs fed soybean meal (1.17 and 1.06 m 1.05g/day).

A steer growth trial was conducted to evaluate dehy and urea as nitrogen supplements in 50% corn cob rations. Steers fed dehy-urea combinations required less (P<.05) feed per unit gain than steers fed urea (7.01 vs 8.12) and no more (P<.05) feed per unit gain than steers fed soybean meal.

¹ Published with the approval of the Director as Paper No. 5304.Journal Series, Nebraska Agricultural Experiment Station.

² The authors gratefully acknowledge Dr. George Kohler of the Western Regional Research Laboratories for supplying the freeze-dried and drum-dried alfalfa samples used in these studies.

³ Present address: University of Nebraska, Northeast Station, Concord 68728

⁴ Department of Animal Science.

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