Satisfactory breeding potential is transiently eliminated in beef bulls with clinical anaplasmosis.
Anaplasma marginale
Anemia
Breeding Soundness Examination (BSE)
Cattle
Fever
Reproduction
Scrotal circumference
Sperm morphology
Sperm motility
Veterinary theriogenology
Journal
BMC veterinary research
ISSN: 1746-6148
Titre abrégé: BMC Vet Res
Pays: England
ID NLM: 101249759
Informations de publication
Date de publication:
29 Oct 2022
29 Oct 2022
Historique:
received:
26
05
2022
accepted:
05
10
2022
revised:
30
09
2022
entrez:
30
10
2022
pubmed:
31
10
2022
medline:
2
11
2022
Statut:
epublish
Résumé
Natural service breeding is common in U.S. cow-calf operations. Diseases impacting bull reproductive performance have significant economic consequences for producers. Anaplasmosis may be an underappreciated cause of poor reproductive performance in bulls. The primary systemic effects of bovine anaplasmosis including anemia, fever, and weight loss, can all result in unsatisfactory reproductive performance. The objective of this pilot study was to evaluate breeding soundness examination (BSE) outcomes and clinical changes in bulls during and upon resolution of clinical anaplasmosis. Anaplasma marginale-challenged bulls were observed for clinical disease and infection progression and changes in breeding soundness compared to uninfected control bulls for 16 weeks. All Anaplasma marginale-challenged bulls were PCR-positive, seropositive, and showed clinical signs by 3-, 17-, and 24-days post-challenge, respectively. Clinical signs of anaplasmosis included pallor, icterus, fever (≥ 40.2 °C), and weight loss. Acute anemia was observed in all challenged bulls with PCV nadirs ≤ 18% and peak percent parasitized erythrocyte ≥ 50%. Decreased scrotal circumference and poor semen quality (e.g., increased percentage of abnormal spermatozoa, decreased progressively motile sperm), were initially observed within days after onset of clinical anaplasmosis signs and continued weeks beyond disease resolution. Control bulls remained negative for A. marginale. This pilot study demonstrates that clinical anaplasmosis reduces breeding soundness in beef bulls. Anaplasmosis should be considered as a differential for bulls with decreased semen quality, especially within endemic areas. A 90 day or greater retest window is recommended for bulls of unsatisfactory breeding potential recently recovered from clinical anaplasmosis.
Sections du résumé
BACKGROUND
BACKGROUND
Natural service breeding is common in U.S. cow-calf operations. Diseases impacting bull reproductive performance have significant economic consequences for producers. Anaplasmosis may be an underappreciated cause of poor reproductive performance in bulls. The primary systemic effects of bovine anaplasmosis including anemia, fever, and weight loss, can all result in unsatisfactory reproductive performance. The objective of this pilot study was to evaluate breeding soundness examination (BSE) outcomes and clinical changes in bulls during and upon resolution of clinical anaplasmosis. Anaplasma marginale-challenged bulls were observed for clinical disease and infection progression and changes in breeding soundness compared to uninfected control bulls for 16 weeks.
RESULTS
RESULTS
All Anaplasma marginale-challenged bulls were PCR-positive, seropositive, and showed clinical signs by 3-, 17-, and 24-days post-challenge, respectively. Clinical signs of anaplasmosis included pallor, icterus, fever (≥ 40.2 °C), and weight loss. Acute anemia was observed in all challenged bulls with PCV nadirs ≤ 18% and peak percent parasitized erythrocyte ≥ 50%. Decreased scrotal circumference and poor semen quality (e.g., increased percentage of abnormal spermatozoa, decreased progressively motile sperm), were initially observed within days after onset of clinical anaplasmosis signs and continued weeks beyond disease resolution. Control bulls remained negative for A. marginale.
CONCLUSION
CONCLUSIONS
This pilot study demonstrates that clinical anaplasmosis reduces breeding soundness in beef bulls. Anaplasmosis should be considered as a differential for bulls with decreased semen quality, especially within endemic areas. A 90 day or greater retest window is recommended for bulls of unsatisfactory breeding potential recently recovered from clinical anaplasmosis.
Identifiants
pubmed: 36309670
doi: 10.1186/s12917-022-03470-7
pii: 10.1186/s12917-022-03470-7
pmc: PMC9617051
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
381Subventions
Organisme : State of Kansas Global Food Systems Seed Grant
ID : 0190 80040
Organisme : State of Kansas Global Food Systems Seed Grant
ID : 0190 80040
Organisme : State of Kansas Global Food Systems Seed Grant
ID : 0190 80040
Organisme : State of Kansas Global Food Systems Seed Grant
ID : 0190 80040
Organisme : National Institute of Food and Agriculture
ID : 2008-68003-27463
Organisme : National Institute of Food and Agriculture
ID : 2008-68003-27463
Informations de copyright
© 2022. The Author(s).
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