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EFFECTS OF TIME OF SEASON AND COTTONSEED MEAL AND LASALOCID SUPPLEMENTATION ON STEERS GRAZING RYE PASTURES¹

Edisto Research and Education Center, Clemson University Blackville, SC 29817

A study was conducted to estimate changes in rye (Secale cereale L.) forage quality during the grazing season and to determine the effects of supplemental cottonseed meal (CSM) with and without the ionophore lasalocid on the growth rate of steers grazing rye pastures. During 1986 to 1987, pasture samples were collected on December 19, January 20, February 19 and March 16 to estimate changes in fiber, N and in vitro OM disappearance (IVOMD) of rye forage. Significant seasonal differences in NDF, ADF, permanganate lignin and IVOMD were detected. Rye forage IVOMD ranged from 74.5 to 83.6% of DM, indicating that quality was high at all sampling times. Nitrogen content also was high and ranged from 2.1 to 4.6% of DM. Ruminal N degradation rate, percentage of N degraded and percentage of escape N indicated that the rye protein was rapidly degraded with less than 25% of the total plant N escaping ruminal breakdown. Ninety-six crossbred yearling steers were assigned to either control, .45 kg CSM/d or .45 kg CSM/d + 150 mg lasalocid/d treatments to determine the effects of supplementation on growth rate while steers grazed rye pastures. Protein supplementation (CSM) increased (P < .05) ADG early in the grazing season but not later. Addition of lasalocid to the protein supplement increased (P < .05) ADG during the spring grazing period and for the entire grazing season. Rye forage is a high-quality feedstuff containing rapidly degraded N throughout the grazing season. Supplementing steers with CSM containing lasalocid improved seasonal weight gains.

Key Words: Rye • Cottonseed Oilmeal • Ionophores • Steers • Protein

² Dept. of Anim. Sci.

³ Dept. of Exp. Stat.

⁴ Mineral composition (% of DM): Ca, 12 to 14; P, 7; NaCl, 17 to 19; K, 1; Mg, 2.5; S, 1.2; Fe, 1; Mn, .03; I, .01; Co, .01; Cu, .02; Zn, .02; Se, .001.

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