Spectral analysis of bovine grazing behavior on Neotyphodium coenophialum infested tall rescue

Dwight H. Seman, John A. Stuedemann, Jon E. Anderson

    Research output: Contribution to journalArticlepeer-review

    7 Scopus citations

    Abstract

    Bovines spend less time grazing and have reduced intake when grazing endophyte-infected (E +), Neotyphodium coenophialum Glen, Bacon, and Hamlin (comb. novo) Morgan-Jones and Gams vs. endophyte-free (E -) tall fescue (Festuca arundinacea, Shreb.). Because bovine grazing behavior follows series of repeatable cycles, cyclic grazing behavior was studied using spectral analysis to determine if grazing response differed due to endophyte presence. Two 0.81-ha paddocks, one containing E - Kentucky-31 (KY-31) tall fescue and one containing E + KY-31 (100% tiller infection rate) were stocked with yearling Angus steers in the spring and summer for two years. Trained observers monitored steer behavior during two 48-h periods in each year. Spectral analysis, a technique used to detect sinusoidal components in a time series, revealed that steers grazing E - fescue repeated grazing behavior in 12- and 6-h intervals while E + steers exhibited an additional 8-h cycle. Steers grazing E + rescue spent less time (P < 0.05) grazing and lying, and more time standing (P < 0.05), than E - steers for both years. Crosscorrelations between hourly grazing behavior and hourly solar radiation resulted in significant, negative correlations at lag = 0 for E + steers and with correlations near zero for E - steers. We conclude steers grazing E + fescue exhibited different grazing behavior from steers grazing E - rescue and that spectral analysis was valuable in describing grazing behavior.

    Original languageEnglish (US)
    Pages (from-to)73-87
    Number of pages15
    JournalApplied Animal Behaviour Science
    Volume54
    Issue number2-3
    DOIs
    StatePublished - Oct 1 1997

    Keywords

    • Cattle
    • Feeding and nutrition
    • Fescue toxicosis
    • Grazing
    • Spectral analysis

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