Journal
THERIOGENOLOGY
Volume 174, Issue -, Pages 121-123Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.theriogenology.2021.08.022
Keywords
Leptospira spp; Abortions; Embryonic loss; Reproductive failures
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Funding
- Fundacao de Amparoa Pesquisa do Estado do Rio de Janeiro (FAPERJ)
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This study found that different strains of Leptospira spp. lead to different reproductive problems, with higher seroreactivity herds experiencing more reproductive issues. Sejroe serogroup was mainly associated with embryonic death, while Icterohaemorrhagiae serogroup was linked to abortions.
This study aims to evaluate the association between reproductive disorders and the main serogroups of Leptospira spp. in dairy herds. Blood samples from 216 cows from nine herds were collected for a Microscopic Agglutination Test (MAT), and a reproductive follow-up with ultrasonography was carried out monthly for at least 12 months. A total of 75 (16.5%) cows were reactive, while seroreactivity to a herd level ranged from 16.0% to 52.8%. Out of the nine herds, in five (55.0%) Sejroe was found to be the predominant serogroup and in four (45.0%) it was Icterohaemorrhagiae. The major reproductive problems identified were embryonic death (ED) and abortions. All herds presented ED and abortion was observed in three (33.3%). Herds with high seroreactivity (>20%) had more reproductive problems. Those with a predominance of Sejroe were associated with ED (P < 0.05), while those with Icterohaemorrhagiae were associated with abortion. The results show that different leptospiral strains lead to different reproductive problems, as well as showing that the main problem -ED -is caused by leptospirosis, particularly for those determined by strains of the serogroup Sejroe. (c) 2021 Elsevier Inc. All rights reserved.
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