Performance-enhancing technologies for steers grazing tall fescue pastures with varying levels of toxicity1

Díaz, José Manuel Cid; Gadberry, M. S.; Beck, Paul; Richeson, J. T.; Hufstedler, G. D.; Hubbell, D. S.; Tucker, J. D.; Hess, Tom; Pohler, K. G.

doi:10.1093/jas/sky244

Cited by 3 publications

(3 citation statements)

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“…This effect may have caused the reduction in steer performance during the final 28 days of the experiment; however, untangling the confounded effects of declining forage quality and increasing alkaloid concentration and environmental stress on cattle ADG in a pasture setting is difficult. Diaz et al (2018) found as ergovaline concentration in the diet increased, cattle ADG decreased, which matches what was reported in the current experiment. Reduced performance in period 2 could be attributed to declining forage quality.…”

Section: Steer Performancesupporting

confidence: 92%

“…Pastures within the experiment expressed a variety of ergovaline concentrations throughout; therefore, the authors regressed average daily gain against pasture ergovaline concentration. Diaz et al (2018) reported the y-intercept of the two treatments was similar; however, each treatment expressed different slopes as the ergovaline concentration increased. For the mineral only treatment group, there was a linear decrease in ADG as ergovaline concentrations increased.…”

Section: Section 5 -Stocker Cattle Management On Tall Fescuementioning

confidence: 93%

“…Ford et al (1977) (Carter et al, 2010). Diaz et al (2018) conducted an experiment comparing a cumulative management strategy of a hormonal implant (40-mg trenbolone acetate, 8-mg estradiol, and 29-mg tylosin tartrate), 150 mg/calf daily monensin, and 1% BW of a 50:50 corn gluten feed:soybean hull supplement to a treatment group receiving only free choice mineral. Pastures within the experiment expressed a variety of ergovaline concentrations throughout; therefore, the authors regressed average daily gain against pasture ergovaline concentration.…”

Section: Section 5 -Stocker Cattle Management On Tall Fescuementioning

confidence: 99%

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Interaction of metsulfuron and nitrogen fertilizer in Tall Fescue forage systems

Adams¹

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Tall Fescue (Schedonorus arundinaceus) is an introduced cool-season bunch grass that is a vital component of forage systems that support beef cattle production in Missouri and much of the eastern United States. This cool-season grass is known for its high forage yield and resistance to environmental stressors such as drought, pest, and grazing. The resilience of tall fescue to stress is attributed to a symbiotic relationship with the fungal endophyte Epichloe coenophiala, which produces ergot-like alkaloids that can negatively impact livestock performance. Replacement of alkaloid producing tall fescue cultivars, such as K31, has been suggested as a strategy to reduce ergot-like alkaloid consumption by livestock; however, this requires extensive resources and time. It has been reported to cost $250 to $400 per acre to replace tall fescue, with an additional 18 months of no grazing while new species emerge. Most current research efforts have focused on managing tall fescue to reduce toxicity risk by decreasing amounts of alkaloids consumed by livestock. Removing parts of the plant, such as the stems and seedheads, that contain greater concentrations of alkaloids by physical or chemical seedhead suppression has proven to be a successful strategy. A metsulfuron herbicide and nitrogen fertilizer were applied on pastures grazed by stocker cattle for three years to evaluate impacts on toxicity and productivity of the forage system. Metsulfuron herbicide reduced seedhead density by 80 percent and decreased ergovaline production; however, this management strategy also caused a decrease in forage yield. Nitrogen fertilizer recovered forage yield losses due to metsulfuron herbicide. Seedhead reduction in response to metsulfuron has potential for reducing alkaloid exposure when grazing endophyte-infected tall fescue.

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Section: Steer Performancesupporting

confidence: 92%

Section: Section 5 -Stocker Cattle Management On Tall Fescuementioning

confidence: 93%