Effects of immunization of Pelibuey lambs with Oestrus ovis digestive tract protein extracts on larval establishment and development

Larval midgut proteins of hematophagous parasites contain strong antigens that can be used for host immunization. This concept has been applied for immunization of Pelibuey sheep against Oestrus ovis L. (Diptera: Oestridae). The aim of this study was to examine the effect of immunization on larval e...

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Bibliographic Details
Published in:Veterinary parasitology 2007, Vol.143 (31), p.140-146
Main Authors: Angulo-Valadez, C.E, Cepeda-Palacios, R, Jacquiet, P, Dorchies, P, Prevot, F, Ascencio-Valle, F, Ramirez-Orduna, J.M, Torres, F
Format: Article
Language:English
Subjects:
animal tissue extracts
antibody formation
antigens
immune response
immunization
immunoglobulin G
lambs
larvae
larval development
membrane proteins
midgut
midgut antigens
myiasis
Oestrus ovis
sheep breeds
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Summary:Larval midgut proteins of hematophagous parasites contain strong antigens that can be used for host immunization. This concept has been applied for immunization of Pelibuey sheep against Oestrus ovis L. (Diptera: Oestridae). The aim of this study was to examine the effect of immunization on larval establishment (LE) and development. Immunized lambs (I, n = 6) received two injections of crude gut membrane protein extracts (GMPE) from third instar larvae with Freund's incomplete adjuvant (FIA) on days 0 (Day of first immunization) and 21 (0.4 and 0.45 mg GMPE/lamb, respectively). The control group (C, n = 5) received physiological saline with FIA. Lambs were challenged with first instars on Day 29 (20 larvae) and Day 43 (25 larvae). Blood samples were collected biweekly and IgG titers were analyzed by ELISA. All lambs were slaughtered on Day 90 and number of larvae recovered, larval stage and larval weight were recorded at necropsy. No significant effect of immunization on LE (C = 28.9%; I = 31.0% P > 0.05) was observed. Antibody titers were higher in the immunized group on Day 28 (P < 0.05), but subsequently similar in both groups. Larval physiological age and weight were also significantly (P < 0.05) affected by immunization. Immunization of Pelibuey lambs with GMPE did not affect LE but did delay O. ovis larval development.
ISSN:0304-4017
1873-2550