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WU ET AL.
TABLE 2 Case information and examination results of the representative jennies.
Animal ID
No.004- 2(A)
Age 4 years old
Kenny- Doig grades
I Breeding history
Failed to conceive despite repeated inseminations in 2021
No.604- 2(B)
4 years old IIA
Had one foal successfully in 2019 and bred in the same year but failed to conceive after multiple attempts of artificial insemination
No.860- 2(C)
5 years old IIB
Successfully delivered a foal in 2020 but had been barren for almost 1 year
Clinical and ultrasonographical findings
Vaginal discharge was not seen at the vulva; the cervix was flaccid. A 39 mm dominant follicle was detected in the left ovary and a 30 mm follicle in the right ovary; uterine horn oedema score was 2 on the left side and 1 on the right side
No vaginal discharge observed. The cervix was slightly tight. A 39 mm dominant follicle was detected in the left ovary and small follicles in the right ovary via transrectal ultrasound. Grade 1 oedema score was detected in the uterine horns
Occasional thin strings of vaginal discharge were observed. A small amount of intrauterine fluid accumulation was observed in the uterus via transrectal ultrasound. Multiple small follicles were observed in both left and right ovaries. A corpus luteum (CL) was observed in the left ovary. Cervix was tight
No.630- 2(D)
7 years old III
Had 2 foals successfully but failed to conceive since 2019 after the second parturition despite repeated inseminations
Abbreviation : CFU, colony forming unit.
Purulent vaginal discharge was observed. Moderate to large amount of fluid accumulated in the uterine lumen; the cervix was mildly tight. Multiple small follicles were observed in both left and right ovaries. A CL was observed in the right ovary. Cervix was tight
Stage of oestrous cycle
Oestrus
LVL fluid appearance Clear but mildly pink
Bacterial culture –
Oestrus
Mildly cloudy
2– 5 CFU on blood agar plate
Dioestrus
Cloudy and mildly pink
11– 50 CFU on blood agar plate, which was identified as Streptococcus equi subsp. Zooepidemicus
Dioestrus
Cloudy with some debris
>50 CFU on blood agar plate, which was identified as Streptococcus equi subsp. Zooepidemicus
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