J. Anim Sci.
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Published online first on February 1, 2008
J. Anim Sci. 1910. doi:10.2527/jas.2007-0388
© 2008 American Society of Animal Science
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J. Anim Sci., doi: 10.2527/jas.2007-0388
©Copyright, 2008, The American Society of Animal Science

ARTICLE

Effect of fat supplementation and wheat pasture maturity on forage intake and digestion characteristics of steers grazing wheat pasture

D. A. Chabot 1, C. D. Chabot 1, L. K. Conway 1, S. A. Soto-Navarro 1*

1 Department of Animal and Range Sciences,New Mexico State University, Las Cruces 88003

* To whom correspondence should be addressed. E-mail: ssoto{at}nmsu.edu.


  Abstract

Nine ruminally cannulated mixed-breed steers were used in a split-plot design to evaluate effects of fat supplementation and forage maturity on intake, digestibility, and ruminal fermentation. Treatment was included in the main plot and stage of forage maturity was in the subplot. Treatments were supplements containing: mineral pack (M) offered at 114 g/d; M plus fiber as soybean hulls-wheat middlings (MF) offered at 0.50% BW; and MF plus tallow (MFT) offered at 0.625% BW. Stage of wheat maturity was used as a subplot (mid-March, MAR; and early April, APR). Steers grazed in a single wheat pasture with supplements offered individually at 0700 daily. There were supplement type x forage maturity interactions (P < 0.05) for forage OM, CP, and NDF intakes. During MAR, forage OM, CP, and NDF intakes were not affected (P > 0.05) by supplementation. During APR, forage OM, CP and NDF intakes differed (MF = M > MFT, P < 0.05). There was also supplement type x forage maturity interaction (P = 0.04) for forage OM digestibility. During MAR, OM digestibility differed (M = MF > MFT, P < 0.05). During APR, OM digestibility differed (MF > M > MFT, P < 0.05). Crude protein digestibility was affected by supplement type (M > MF > MFT, P < 0.05) and stage of forage maturity (MAR > APR, P < 0.01). Rates of DM and NDF ruminal disappearance were not affected (P > 0.05) by supplement or forage maturity. Supplementation increased (P < 0.05) ruminal propionate concentration (19.7, 21.4, and 25.1 ± 0.49 mol/100 mols for M, MF, and MFT, respectively). Tallow can be used in supplements for cattle grazing wheat pasture to increase energy intake without negatively affecting forage intake, or ruminal fermentation, particularly if used early on the stage of wheat maturity.

Key Words: cattle, fat supplementation, stockers, wheat pasture






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