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Phytochemical complementarities among endophyte-infected tall fescue, reed canarygrass, birdsfoot trefoil and alfalfa affect cattle foraging

Published online by Cambridge University Press:  21 October 2011

T. D. Lyman ,
F. D. Provenza ,
J. J. Villalba  and
R. D. Wiedmeier
T. D. Lyman*
Affiliation:
Department of Wildland Resources, Utah State University, Logan 84322-5230, USA Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan 84322-5230, USA
F. D. Provenza
Affiliation:
Department of Wildland Resources, Utah State University, Logan 84322-5230, USA
J. J. Villalba
Affiliation:
Department of Wildland Resources, Utah State University, Logan 84322-5230, USA
R. D. Wiedmeier
Affiliation:
Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan 84322-5230, USA
*
†E-mail: tiffannyl@cc.usu.edu
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Abstract

We determined whether plant diversity and sequence of plant ingestion affected foraging when cattle chose from plants that varied in concentrations of alkaloids, tannins and saponins. We hypothesized cattle that ate high-alkaloid grasses (endophyte-infected tall fescue (TF) or reed canarygrass (RCG)) would prefer forages high in tannins (birdsfoot trefoil, BFT+) or saponins (alfalfa, ALF+), because tannins and saponins can bind to alkaloids, presumably reducing their absorption. We further hypothesized that forages with tannins or saponins consumed before, rather than after, foraging on high-alkaloid grasses would promote greater use of those grasses presumably by binding to alkaloids, thereby reducing their absorption. In Phase 1, cattle (n = 32) grazed on either high (+) or low (−) alkaloid grass (TF or RCG) pastures for 30 min each morning at 0600 h and were then offered a choice of BFT+, BFT−, ALF+ and ALF− for 60 min each day for 12 days. In Phase 2, cattle (n = 32) were first offered a choice of BFT+ or ALF+ for 30 min at 0600 h and then placed on grass (TF+ or −, or RCG+ or −) pastures for 60 min for 12 days. In both phases, we had four spatial replications of four treatments with 2 per calves assigned to each of the 16 replications per treatment combinations. Scan samples of individuals at 2-min intervals were used to determine incidence of foraging on each plant species (%). Cattle grazed more on RCG than on TF in Phases 1 (62% v. 27%; P = 0.0015) and 2 (71% v. 32%; P = 0.0005). In Phase 1, cattle that first foraged on RCG+ or TF− subsequently preferred ALF over BFT, whereas cattle offered RCG− or TF+ foraged on ALF and BFT equally. Foraging by cattle on RCG was cyclic during Phase 1, whereas cattle foraging on TF markedly decreased incidence of use of TF from 41% to only 16% by the end of the 12-day trial (P = 0.0029). Contrary to the cyclic (RCG) or steadily declining (TF) use of grasses in Phase 1, cattle steadily and dramatically increased foraging on both RCG and TF throughout Phase 2, when they first grazed BFT+ or ALF+ followed by high-alkaloid grasses (P = 0.0159). Our findings suggest that in plant species the sequence of ingestion influenced foraging behavior of cattle and that secondary compounds influenced those responses.

Keywords

alkaloidscattleforaging behaviorsaponinstannins

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Type
Full Paper
Information
animal , Volume 6 , Issue 4 , April 2012 , pp. 676 - 682
Copyright
Copyright © The Animal Consortium 2011

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