[The problems of mastitis in mares].

The research article explores the issue of mastitis in mares, focusing on the timing of its occurrence, its clinical symptoms, and the bacteriological agents that cause the disease. Analysis took place using data from 33 afflicted mares, revealing the most prevalent causative agent to be Streptococci.

Research Methodology and Findings

The investigators studied a group of 33 mares suffering from mastitis. The sample population was divided based on the timing of mastitis appearance:

• Approximately 27.3% showed signs before delivery
• 24.2% exhibited symptoms immediately after delivery (up until the third day)
• 12.1% developed infection during the middle and late stages of lactation
• 9.1% presented infection immediately after their foals were weaned
• 27.3% were non-pregnant mares who contracted the infection outside the lactation period

The clinical symptoms were detailed and it was observed that in most cases, both halves of the udder were infected.

Bacteriological Evaluation

The team conducted a bacteriological investigation on the mastitis cases, isolating a total of 70 germ types. Out of these 70:

• More than half, around 36, were identified as streptococci, with beta-haemolytic streptococci being detected in 25 cases.
• E. coli was found in only three instances
• Coliform germs were found in six cases
• Klebsiella was identified in merely two instances

Evaluation of Healthy Mares

For comparison, the investigators also examined milk samples taken from healthy mares during their first week of post-delivery. Evidence of bacterial contamination appeared in

• 13 mares, approximately 41.9% of the healthy group, indicating that they harbored bacteria despite being asymptomatic
• 21.0% of the overall milk samples (out of 62)

This data again highlighted the prevalence of streptococci, seemingly underlining its primary role in mastitis in mares.