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The ability of a yeast-derived cell wall preparation to minimize toxic effects of high-alkaloid tall fescue straw in beef cattle

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dc.contributor.advisor Bohnert, David W.
dc.creator Merrill, Melissa L.
dc.date.accessioned 2007-02-27T23:45:17Z
dc.date.available 2007-02-27T23:45:17Z
dc.date.issued 2007-02-27T23:45:17Z
dc.identifier.uri http://hdl.handle.net/1957/4044
dc.description Graduation date: 2007
dc.description Presentation date: 2007-02-05
dc.description.abstract Two experiments were conducted to evaluate the influence of a yeast-derived cell wall preparation (YCW) on forage intake and digestibility, ruminal fermentation characteristics, serum prolactin and prolactin stores, and milk production in beef cattle consuming high-alkaloid tall fescue straw. In Exp. 1, 16 Angus x Hereford ruminally cannulated steers (200 ± 6 kg BW) were blocked by BW and within block assigned to one of four treatments containing YCW at: 1) 0, 2) 20, 3) 40, or 4) 60 g hd-1 d-1. Tall fescue straw (579 ppb ergovaline) was provided at 120% the previous 5-d average intake with soybean meal (0.068% BW; CP basis) used as a CP supplement. In the 29-d digestion study, total DM, OM, and NDF intake, and DM, OM, and NDF digestibilities were not different (P > 0.13). Linear decreases in ruminal indigestible ADF outflow (P = 0.10) and liquid dilution rate (P = 0.03) were noted as YCW increased. Weekly serum prolactin was not affected by treatment (P > 0.50); however, prolactin stores linearly increased as YCW increased (P = 0.05). In Exp. 2, 60 Angus x Hereford cows (517 ± 5 kg BW; approximately 200 d gestation) were stratified by BCS (5.0 ± 0.1) and randomly assigned to the same four YCW treatments as Exp. 1 (447 ppb ergovaline high-alkaloid straw) with the addition of a low-alkaloid straw (149 ppb ergovaline; no YCW supplementation) as a positive control (CON). Cows were provided ad libitum access to straw and were supplemented with soybean meal (0.1% BW; CP basis) daily. One cow was removed from the 40 g hd-1 d-1 treatment due to clinical signs of fescue toxicosis. No differences (P > 0.20) were observed in pre- or post-calving BCS change or change in post-calving BW. Control cows gained more weight (P = 0.02) pre-calving compared to 0 g hd-1 d-1 cows. A linear increase (P = 0.04) in milk production was observed as YCW increased at 60 d post-partum. Serum prolactin post-calving and change from initial to post-calving increased linearly (P = 0.02 and P = 0.05, respectively) with increasing YCW supplementation. Also, post-calving serum prolactin was higher (P = 0.002) in CON compared to 0 g hd-1 d-1 cows. The YCW seems to alleviate some symptoms of the fescue toxicosis and, therefore, has the potential to be used successfully with other management practices when feeding or grazing high-alkaloid tall fescue. en
dc.format.extent 372227 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.subject cattle en
dc.subject ergot alkaloids en
dc.subject ergovaline en
dc.subject prolactin en
dc.subject.lcsh Cattle -- Feeding and feeds en
dc.subject.lcsh Feed additives en
dc.subject.lcsh Straw as feed en
dc.subject.lcsh Tall fescue -- Toxicology -- Testing en
dc.subject.lcsh Ergot alkaloids -- Toxicology en
dc.title The ability of a yeast-derived cell wall preparation to minimize toxic effects of high-alkaloid tall fescue straw in beef cattle en
dc.type Thesis en
dc.degree.name Doctor of Philosophy (Ph. D.) in Animal Science en
dc.degree.level Doctoral en
dc.degree.discipline Agricultural Sciences en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Kling, Jennifer G.
dc.contributor.committeemember Males, James R.
dc.contributor.committeemember DelCurto, Timothy
dc.contributor.committeemember Widrick, Jeffrey J.

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