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Titolo:
EFFECTS OF THE BORN FLY (DIPTERA, MUSCIDAE) ON PHYSIOLOGICAL AND NUTRITIONAL RESPONSES OF BEEF STEERS - CONTINUOUS FLY POPULATION-LEVELS
Autore:
PRESLEY SM; KNAPP FW; BOLING JA; BURG JG;
Indirizzi:
100 SCARSDALE DR STAFFORD VA 22554 UNIV KENTUCKY,DEPT ENTOMOL LEXINGTON KY 40546 UNIV KENTUCKY,DEPT ANIM SCI LEXINGTON KY 40546
Titolo Testata:
Journal of economic entomology
fascicolo: 1, volume: 89, anno: 1996,
pagine: 138 - 143
SICI:
0022-0493(1996)89:1<138:EOTBF(>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
HORN FLY; INFESTATIONS;
Keywords:
HAEMATOBIA IRRITANS; BEEF STEERS; PHYSIOLOGICAL RESPONSE; NUTRITIONAL RESPONSE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
S.M. Presley et al., "EFFECTS OF THE BORN FLY (DIPTERA, MUSCIDAE) ON PHYSIOLOGICAL AND NUTRITIONAL RESPONSES OF BEEF STEERS - CONTINUOUS FLY POPULATION-LEVELS", Journal of economic entomology, 89(1), 1996, pp. 138-143

Abstract

Twenty-four Hereford-Angus crossbred beef steers were exposed to 0, 75, 150, and 225 horn flies, Haematobia irritans (L.), per head under controlled environmental conditions. The physiological and nutritional indices of all steers were recorded during a 14-d infestation period. Overall rectal temperature increased in steers exposed to 225 H. irritans per head. Feed intake and nitrogen consumption by steers exposed to 225 H. irritans was loner than uninfested steers during the first 4 d. Overall serum cortisol was lower in steers exposed to 150 or 225 H.irritans per head compared with unexposed steers. Compared with unexposed steers, packed cell volume (percentage) was lower in steers exposed to 150 H. irritans on days 4, 7, and 14, lower in steers exposed to225 H. irritans on days 7 and 14, and lower in steers exposed to 75 H, irritans on day 14. Blood urea nitrogen (BUN) was higher on day 1 insteers exposed to 75 H. irritans per head compared with uninfested steers,whereas BUN was lower in 225 H. irritans-exposed steers on days 7, 10, and 14 when compared with uninfested steers. Our data, in conjunction with previously published data, suggest that rectal temperature increases in beef steers exposed to >150 H. irritans per bend, and water consumption and urine production increases at infestation levels >225 H. irritans per head. Our data were unable to resolve H. irritans effects on steer heart rate, respiration rate, urinary nitrogen excreted, nitrogen retained, and serum cortisol levels.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 01:00:46