Few things reflect a well-run dairy like relaxed, happy cows chewing their cud in the milking parlor. Rotary parlors are designed to support that kind of consistency. They bring comfort and efficiency to the milking process through steady movement and streamlined routines.
While rotary parlors are not a new way of milking cows, there have been novel changes to their design and added technologies. Rotaries are a progressive path forward for farms looking to upgrade from milking cows in straight parlors, as well as farms that may not be a good fit for fully automated milking facilities. Harvesting high-quality milk both quickly and efficiently has become more critical than ever for ensuring profitability, animal welfare and overall farm sustainability, making rotaries a strong fit for many modern dairy operations.
Rotary parlors offer key differences from other milking systems. Let’s review practical options for operations of all sizes.
Increased cow throughput
By considering rotation speed and size of the platform, it is possible to milk more cows per hour with a rotary parlor than with any other type of milking system. Increasing cow throughput allows for herd growth opportunities, if the farm’s footprint allows. To put it into perspective, large farms operating rotaries with 120 stalls or more and spinning at a seven-minute revolution time can milk well over 800 cows per hour. Increased cow throughput also applies to smaller farms, which are not necessarily looking to increase in herd size, but rather milk their existing herd more efficiently to allow employees to do other tasks during time that would have otherwise been spent milking.
Scalability
Unlike fully automated milking facilities, many rotaries are purchased a size or two bigger than what would be needed, with the intent of significantly expanding the herd size. Different vendors offer different-sized decks. For example, a small rotary can milk about 40 cows per rotation, whereas the larger decks can milk 128 cows per rotation.
Rotaries can also have different stall sizes to accommodate different breed statures. Like many automated milking systems or straight parlors with gang indexing available, some vendors have an adjustable brisket bar option, which allows cows to have more or less room in the stall depending on the selected setting. This is a nice feature for herds that are crossbreeding and can expect variability in frame size (i.e., Holstein-Jersey crossbreds), as the rotary may start with bigger-bodied Holsteins and then in a few years have smaller-statured crosses, all of which can be milked on the same deck with adjustments made to the brisket bar.
Improved labor efficiency
Fully automated milking facilities have the greatest ability to reduce the labor needed to milk cows; rotary parlors can offer some labor efficiency perks, too. Labor efficiency becomes vital when there is less labor available or competition with other industries pulling from the same labor pool. For farms considering rotaries in regions where labor is harder to find, solidifying an excellent milking prep procedure with fewer high-caliber employees working in the parlor can improve efficiency during a transition from straight parlors, which typically require more personnel.
As few as one or two employees can milk cows on small-to-medium-sized platforms (40- to 60-stall rotaries) because the employees can stand in one place to work while the cows come to them, unlike in straight parlors where the employees must move to the cows in their zone, which takes away from focus and eats up time. On small-to-medium-sized platforms, employees often assume multiple tasks (i.e., dipping, stripping, wiping or attaching) depending on how fast the rotary is turning and the milking prep standard operating procedure in place.
On larger rotaries (80-128 stalls), reducing the number of employees may actually reduce efficiency because a faster-spinning rotary makes it more ergonomically challenging for employees to perform tasks accurately. Milking cows on a larger rotary can be more physically demanding than a straight parlor or automated milking facility because the fast, repetitive motions for dipping, stripping, wiping and attaching units is continuous. Improving labor efficiency on large rotaries may involve frequently rotating employee parlor tasks to reduce fatigue and having the same number of milkers but fewer, longer milking shifts in a 24-hour period.
Automation integration
As the dairy industry keeps demanding more innovation, all milking systems have tremendous opportunity for integration of automation. The exponential interest in precision farming makes data acquisition through the use of a variety of sensors a no-brainer when considering a parlor upgrade, and most rotaries have access to the latest tech. Some popular technology options for rotaries include precision milking, automated pre- and post-teat sprayers, and milk meter automation.
Precision milking is currently a hot topic because milking each cow as an individual has the potential to improve production potential, cow longevity and udder health over time. As mentioned earlier, automated teat sprayers (pre- or post-) can improve workplace satisfaction for high-quality rotary employees working on small-to-medium-size rotaries, as they eliminate the need for a human to disinfect teats before the milking unit is attached or after the unit has been removed. They are also proven to be more accurate and use less teat dip than human employees. Automated teat sprayers on larger rotaries can reduce the head count for parlor employees, resulting in labor savings, but there is potential for added maintenance costs.
While stall point automation is not a new concept, it remains a valuable tool for dairy operations. Setting custom pulsation ratios and milk flow unit retract thresholds is a timeless example of reliable, pro-cow welfare technology that benefits both cows and producers. When combined with real-time data from today’s milk flow meters, these features help set the stage for more informed management and higher-performing systems.
As rotary systems are considered for future parlor upgrades, it is important to evaluate the changes needed to support new technology and infrastructure. For any milking system, understanding the cost of harvesting 100 pounds of milk – both today and 10 years from now – is essential. Determining whether a system is the right fit for long-term goals should include an assessment of equipment costs, maintenance requirements and labor demands. When it comes to milking cows, going in circles (literally) can be a forward-thinking choice that fuels both operational efficiency and dairy sustainability.
