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Journal of Animal Science, Vol 74, Issue 3 639-647, Copyright © 1996 by American Society of Animal Science

JOURNAL ARTICLE

Evaluation of the potential of supplements to substitute for low-quality, tallgrass-prairie forage

S. D. Stafford, R. C. Cochran, E. S. Vanzant and J. O. Fritz
Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506, USA.

Thirteen ruminally fistulated steers (260 +/- 15 kg) were used in an incomplete Latin square with 13 treatments and four periods to evaluate the potential for different supplements to substitute for intake of low-quality, tallgrass-prairie forage. Steers were given ad libitum access to forage and received either no supplement (control = CTL) or one of four supplements, each fed at three different levels of intake. Supplements included 1) moderate CP (17.5%) concentrate (MCP-CON), 2) high CP (32.7%) concentrate (HCP-CON), 3) long-stem alfalfa hay (LSAH; 17.2% CP), and 4) alfalfa pellets (AP; 16.3% CP). Concentrates were mixtures of sorghum grain and soybean meal. Supplements were fed to supply .05, .10, and .15% BW of CP/d. Forage intake and digestible DMI were increased (P < .01) for supplemented steers compared with CTL (22 and 96%, respectively). Steers receiving increasing MCP-CON exhibited a quadratic (P = .03) forage intake response. Offering MCP-CON higher than .10% BW of CP/d (approximately .59% BW of DM) resulted in a substitution rate of -.56 g of forage/g of supplement. Although effects were not significant for steers receiving LSAH, the decline in forage intake at the high level of supplementation (-.48 g of forage/g of supplement) was similar in magnitude to that for MCP-CON. Forage intake increased linearly (P < .01) across supplementation levels for HCP-CON and AP supplements. Passage rates were faster (P < .01) for supplemented steers. However, passage rates for HCP-CON and AP groups increased linearly (P < .01) with increasing supplement, whereas they declined at the highest supplementation rate for MCP-CON and LSAH (quadratic, P < or = .05). Most fermentation variables displayed positive responses to supplementation per se and to increasing amount of supplements offered. In conclusion, although supplementation effectively enhances the use of low-quality forage, supplement type may affect the likelihood of observing substitution effects.


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K. C. Olson, R. C. Cochran, E. C. Titgemeyer, C. P. Mathis, T. J. Jones, and J. S. Heldt
Prediction of the energy content of tallgrass prairie hay
J Anim Sci, June 1, 2008; 86(6): 1372 - 1381.
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Copyright © 1996 by the American Society of Animal Science.