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Plasma characteristics of beef cattle classified as resistant or susceptible to horn flies

By: Tarn, C.Y.
Contributor(s): Brown, A.H. Jr [coaut.] | Johnson, Z.B [coaut.] | Rosenkrans, C.F. Jr [coaut.] | Steelman, C.D [coaut.].
Material type: materialTypeLabelArticlePublisher: 1994ISSN: 0021-8812.Subject(s): America | Animal genetics and breeding | Animal physiology | Arthropoda | Artiodactyla | Blood | Bovidae | Bovinae | Cattle | Delta states usa | Diptera | Domestic animals | Haematobia | Insecta | Livestock AGROVOC | Mammals | Meat animals | Muscidae | North America | Pests of animals | Resistance to injurious factors | Ruminants | Southern states usa | USA | Useful animalsDDC classification: 95-055131 In: Journal of Animal Science v. 72, no. 4, p. 886-89095-055131Summary: Horn flies inflict economic losses on cattle producers. Therefore, the objective of this study was to identify a serological marker for cows that are innately resistant to horn flies. Plasma characteristics (optical density, cortisol, and protein pattern) were studied in beef cattle classified (cow-type) as horn fly resistant or susceptible. Cows (n = 30) of five breed groups were used in this study. Cows were bled via jugular venipuncture in May (the beginning of the horn fly season). Plasma optical density at wavelengths 200 and 464 nm was different (P < 0.05) between resistant and susceptible cattle. Cow-type also affected (P < 0.05) area percentage for proteins with running molecular weights (Mr) of 74,000 and 54,000 daltons. Breed group affected (P < 0.05) optical density at wavelengths 200, 280, 320, and 464 nm and concentration of cortisol in plasma. When the ratio of area percentage for protein bands 7 and 9 (Mr 74,000 and 54,000, respectively) was determined, cows could be categorized as horn fly resistant or susceptible. These data suggest that a serological marker for horn fly resistant cattle has been identified; however, the marker will need to be tested on a larger population of cattleCollection: AGRIS Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

AGRIS Collection 95-055131 (Browse shelf) 1 Available 95-055131
Total holds: 0

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0021-8812

Horn flies inflict economic losses on cattle producers. Therefore, the objective of this study was to identify a serological marker for cows that are innately resistant to horn flies. Plasma characteristics (optical density, cortisol, and protein pattern) were studied in beef cattle classified (cow-type) as horn fly resistant or susceptible. Cows (n = 30) of five breed groups were used in this study. Cows were bled via jugular venipuncture in May (the beginning of the horn fly season). Plasma optical density at wavelengths 200 and 464 nm was different (P < 0.05) between resistant and susceptible cattle. Cow-type also affected (P < 0.05) area percentage for proteins with running molecular weights (Mr) of 74,000 and 54,000 daltons. Breed group affected (P < 0.05) optical density at wavelengths 200, 280, 320, and 464 nm and concentration of cortisol in plasma. When the ratio of area percentage for protein bands 7 and 9 (Mr 74,000 and 54,000, respectively) was determined, cows could be categorized as horn fly resistant or susceptible. These data suggest that a serological marker for horn fly resistant cattle has been identified; however, the marker will need to be tested on a larger population of cattle

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