Efficacy of Brahman Characters in Reducing Weight Loss of Steers Exposed to Mosquito Attack
Authors: Steelman, C. D.; White, T. W.; Schilling, P. E.
Source: Journal of Economic Entomology, Volume 69, Number 4, August 1976 , pp. 499-502(4)
Publisher: Entomological Society of America
Abstract:In a 2-year study, attack by the mosquitoes, Psorophora Columbiae (Dyar and Knab) , Anopheles quadrimaculatus Say, and A. crucians Weidmann reduced the average daily gain of steers 0.05 kg/head/day or higher.
Injury thresholds for purebred Hereford steers were thought to be within a grid count range of 25–36 bloodfed mosquitoes per 0.09 m2 (1 ft2) and for F1 Herford × Brahman crossbred steers within a range of 36–43/0,09 m2 (1 ft2) over a 28-day period. Mosquito population densities reached the injury threshold level for purebred Hereford steers during four out of five 28-day feeding periods in 1973 and 1975. The injury threshold for the crossbred steers was reached in only two out of the five 28-da y periods.
In 1973, Hereford steers protected from mosquito attack sold for $2.48/head more than unprotected Hereford steers, and the protected crossbred steers sold for $0.42/head more than the unprotected crossbred steers. The corresponding increases in value during 1975 were $4.25 and $2.20/head, respectively.
Highly significant correlation coefficients (P<0.01) were obtained between grid counts and landing rate counts, grid counts and CDC light traps, and grid counts and New Jersey light traps.
No significant difference (P>0.05) was found in the numbers of blood fed mosquitoes resting on the walls of barns containing either Hereford or crossbred steers or between the average daily feed intake of the 2 breeds.
Document Type: Research Article
Publication date: August 1976
- 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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