Irregular Findings on Teatcups in Milking Parlours in Sheep and Goat Farms and Potential Predictors

Abstract

The objectives of the present study were as follows: (a) to describe the prevalence of irregular findings on teatcups in milking parlours with dairy sheep and goats after the post-milking cleaning procedures had been completed, (b) to associate staphylococcal isolation from teatcups with the presence with irregular findings and (c) to identify predictors of the presence of irregular findings on teatcups. The teatcups in the milking parlour of 255 sheep and 66 goat farms were macroscopically evaluated for the presence of irregular findings immediately after the completion of cleaning of the parlour. In total, 1115 and 303 teatcups, respectively, were assessed. A detailed interview with the farmer served to record the characteristics of the milking parlour and obtain information about husbandry and health management variables in the farm. Teatcups with macroscopically evident irregular findings were observed in 150 milking parlours (46.7%). Overall, 593 teatcups (41.8%) were found with macroscopically evident irregular findings. Dirt, milk residues and cracks or tears were recorded in the teatcups of 90.0%, 36.0% and 12.7% of parlours with irregular findings. Staphylococci were more frequently isolated from teatcups with irregular findings than from undamaged ones: from 37.4% (222/593) versus 12.8% (106/825). They were more frequently isolated from teatcups with milk residues (39.4%) and teatcups with dirt (39.0%). Via multivariable analysis, the following three variables emerged as significant predictors of presence of teatcups with irregular findings: the daily number of milking sessions, month into the lactation period at sampling and number of available milking units per animal position. The study provides, for the first time internationally, an appraisal of the frequency of problematic teatcups in the milking parlours of small ruminant farms. The analysis of predictors has provided a focus for specific management aspects, where interventions need to be performed, in order to improve the situation in farms with problems. The consequent increased staphylococcal burden on teatcups with irregular findings points to the increased risk of intramammary infections in such cases.

Keywords: Staphylococcus; cleaning; goat; mastitis; milk; milking parlour; sheep; teatcup.

Figure 1

Location of the small ruminant farms (right map: sheep flocks; left map: goat herds) around Greece, which were visited for the evaluation of teatcups in milking parlours and for the collection of samples and information.

Figure 2

Proportion of sheep and goat farms in milking parlours in which teatcups with dirt were observed, in accordance with the month into the lactation period at each farm at the time of the visit (dashed line indicates tendency line).

Figure 3

Proportion of sheep and goat farms in milking parlours in which teatcups with milk residues were observed, in accordance with the daily number of milking sessions performed in the farm.