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USDA, ARS, El Reno, OK and Oklahoma State University, Stillwater 74078
Abstract
Two N metabolism experiments were conducted to determine whether the frequency with which a protein supplement was fed would affect nutrient digestibility and N utilization of diets composed primarily of low quality native grass hay. In each experiment, 12 steers were randomly assigned to one of four treatments: (1) control—mature native range hay; (2) range hay with protein supplement fed daily; (3) range hay with protein supplement fed on alternate days and (4) range hay with protein supplement fed every fourth day. A 3-wk preliminary period was followed by four consecutive 8-d total fecal and urine collection periods. In Exp. 1, the supplement was cottonseed meal (CSM) fed at a daily rate of .45 kg. The hay contained 8% crude protein and feeding frequency did not influence (P>.05) nutrient digestion or N utilization. However, regardless of feeding frequency, supplementation with CSM resulted in a 14% increase (P<.05) in crude protein digestibility and tended to increase N retention. In Exp. 2, approximately 12 kg small-grains forage (SGF) daily was the protein supplement. The addition of SGF to the control diets increased (P<.05) digestibility of both dry matter (36.7 to 43.7%) and of N (–17.1 to 46.5%). When N digestibility was the response criterion, interaction between feeding frequency and period was observed (P<.05). The steers were marginal to negative in N balance, even when SGF was fed. A significant feeding frequency x period interaction was also evident for N balance.
1 Journal Article 3920 of the Agr. Exp. Sta., Oklahoma State Univ., Stillwater. This research was conducted by the USDA, ARS, Southern Region, in cooperation with Oklahoma State Univ.
2 Southwestern Livestock and Forage Research Station, USDA, ARS, Rt 3, El Reno, OK 73036.
3 Present address: Alfalfa Co. Feeders, Box 246, Cherokee, OK 73728.
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