Milk leakage--an increased risk in automatic milking systems

Area of Science:

• Veterinary Science
• Animal Husbandry
• Dairy Science

Background:

• Milk leakage (ML) between milkings in dairy cows is linked to a higher risk of udder infections and mastitis.
• Preliminary observations suggest ML may be more prevalent in automatic milking systems (AMS) compared to conventional milking systems (CMS).

Purpose of the Study:

• To compare the incidence of milk leakage in dairy cows housed in AMS versus CMS.
• To investigate the relationship between milk leakage and various cow and management factors.

Main Methods:

• A comparative study involving 230 dairy cows over two years, observed at 2-hour intervals during six 24-hour periods.
• Cows were housed in either free-stall or tie-stall barns and milked using AMS or CMS (herringbone parlor).
• Data collected included milk leakage occurrences, milk production, parity, lactation stage, estrous status, and milking intervals.

Main Results:

• Milk leakage occurred significantly more often in AMS (39.0% of cows, 16.2% of cow days) compared to CMS (11.2% of cows, 2.9% of cow days).
• In AMS, primiparous cows (62%) were more likely to leak milk than multiparous cows (28%).
• Milk leakage was more frequent in rear quarters and often observed when cows were lying down, with variable milking intervals in AMS.

Conclusions:

• Automatic milking systems are associated with a higher incidence of milk leakage in dairy cows compared to conventional systems.
• Understanding factors contributing to milk leakage in AMS is crucial for developing strategies to mitigate udder disease risks.