Dynamics of peripheral blood flow for endophyte-naive cattle fed toxic tall fescue seed

Authors

  • G.E. Aiken
  • B.H. Kirch
  • J.R. Strickland

DOI:

https://doi.org/10.33584/rps.13.2006.3164

Abstract

Doppler ultrasonography was used to measure blood flow dynamics in the caudal artery of heifers that were fed diets with either endophyte-infected (E+) or non-infected (E+) tall fescue (Festuca arundinacea Schreb.) seed. Heifers were assigned to six pens and during an adjustment period were fed alfalfa hay for 5 d, and then the hay plus a concentrate with E- tall fescue seed for 9 d. An 11-d experimental period followed with three pens being changed to hay plus concentrate with E+ seed. Caudal artery area in E+ heifers had declined by 4 h from the initial feeding of the E+ diet before stabilising at the lower level between 4 and 28 h. Heart rates followed a similar trend. Blood flow rate was lower in E+ heifers from 28 h onwards. Results indicated that vasoconstriction can occur in cattle within 28 h from initial consumption of toxic fescue. Keywords: tall fescue, fescue toxicosis, cattle, vasoconstriction

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Published

2007-01-01

How to Cite

Aiken, G., Kirch, B., & Strickland, J. (2007). Dynamics of peripheral blood flow for endophyte-naive cattle fed toxic tall fescue seed. NZGA: Research and Practice Series, 13, 387–389. https://doi.org/10.33584/rps.13.2006.3164

Issue

Vol. 13 (2007): 6th International Symposium on Fungal Endophytes of Grasses

Section

Past volumes

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