Steer responses to feeding soybean hulls and steroid hormone implantation on toxic tall fescue pasture

Journal of Animal Science
J M CarterF N Schrick

Abstract

Crossbred steers were grazed in the spring and early summer on endophyte-infected (Neotyphodium coenophialum), Kentucky-31 tall fescue (Lolium arundinaceum) pastures to evaluate effects and interactions of feeding pelleted soybean hulls (PSBH) and steroid hormone implants (SHI) on steer performance, serum prolactin, and hair coat ratings (HCR). Steers were stratified by BW for assignment to six 3.0-ha toxic tall fescue pastures. With or without daily PSBH feeding, treatments were assigned randomly to pastures as the main plot treatment in a split-plot design. Pelleted soybean hulls were group-fed to provide 2.3 kg(steer·d(-1)) (as fed). With or without SHI (200 mg of progesterone and 20 mg of estradiol) treatments were randomly assigned as the subplot treatment to 2 steer subgroups within each pasture. Sixty-four steers were grazed for 77 d in 2007, and 60 steers were grazed for 86 d in 2008. Pasture forage mass declined linearly over time, but the rate of decline was greater (P = 0.001) in 2007 than in 2008. Pasture forage mass was never below 2,300 kg of DM/ha in either year. Average daily gain for steers on the combined PSBH and SHI treatments was greater (P < 0.01) than for those on the PSBH-only, SHI-only, and control (no ...Continue Reading

References

Aug 23, 2006·Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc·S L Lodge-IveyA M Craig
May 17, 2007·Journal of Animal Science·J L KlotzJ R Strickland

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Citations

Mar 15, 2016·Frontiers in Veterinary Science·Glen E AikenLowell P Bush
Dec 6, 2014·Frontiers in Chemistry·Glen E Aiken, Michael D Flythe
Jan 29, 2021·Translational Animal Science·Parker A HenleyDaniel W Shike

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