Injury Thresholds and Production Loss Functions for the Lone Star Tick, Amblyomma americanum (Acari: Ixodidae), on Pastured, Preweaner Beef Cattle, Bos taurus
Author: Barnard, Donald R.
Source: Journal of Economic Entomology, Volume 78, Number 4, August 1985 , pp. 852-855(4)
Publisher: Entomological Society of America
Abstract:Production loss (decreased average daily gain [ADG]) in preweaner beef cattle, Bos taurus (L.), is a logarithmic function of the number of feeding female lone star ticks, Amblyomma americanum (L.) (ln X). In 1982, Ŷ, the estimated change in ADG (kg) in tick-infested calves was Ŷ = 0.1342 − 0.0582(ln X). In 1983, Ŷ = 0.5107 − 0.1671(ln X). Threshold values for production loss were 10 and 21 female A. americanum in 1982 and 1983, respectively. Slopes of the regression functions fitted to data in both years were not significantly different. The fitted production loss function for data from both years combined, Ŷ = 0.2810 − 0.103(ln X), estimated an injury threshold of 15 feeding female A. americanum per calf.
Document Type: Research Article
Publication date: August 1, 1985
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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