TY  - JA
AU  - Tarn,C.Y.
AU  - Brown,A.H.Jr
AU  - Johnson,Z.B.
AU  - Rosenkrans,C.F.Jr
AU  - Steelman,C.D.
TI  - Plasma characteristics of beef cattle classified as resistant or susceptible to horn flies
SN  - 0021-8812
U1  - 95-055131 
PY  - 1994///
KW  - America
KW  - Animal genetics and breeding
KW  - Animal physiology
KW  - Arthropoda
KW  - Artiodactyla
KW  - Blood
KW  - Bovidae
KW  - Bovinae
KW  - Cattle
KW  - Delta states usa
KW  - Diptera
KW  - Domestic animals
KW  - Haematobia
KW  - Insecta
KW  - Livestock
KW  - AGROVOC
KW  - Mammals
KW  - Meat animals
KW  - Muscidae
KW  - North America
KW  - Pests of animals
KW  - Resistance to injurious factors
KW  - Ruminants
KW  - Southern states usa
KW  - USA
KW  - Useful animals
N1  - Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0021-8812
N2  - 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
T2  - Journal of Animal Science
ER  -