Research at UBC has now recruited the cows’ help in designing more appropriate maternity pens by conducting a series of “preference” experiments in which we allow the cows to vote with their feet.
Below, we describe the results of three different preference experiments designed to determine what features are important in the design of maternity pens.
Earlier work on feral and extensively managed cattle tells us about the choices cows make in the natural environment. Cows typically will leave the herd to find a secluded area to give birth – for example, an area of tall grass or bushes with soft ground cover.
From these observations, we hypothesized that indoor-housed cows are motivated to seek seclusion from herdmates (and other perceived threats) and will use a “hide” if given the choice.
To test if cows are motivated to hide at calving, we reconfigured our pens at the UBC Dairy Centre in Agassiz, British Columbia.
The experimental maternity pens gave cows the choice between an 18-square-meter open sawdust bedded pack and 15-square-meter sawdust bedded pack surrounded by a 1.5-meter-high wall that provided a visual barrier between the cow and the rest of the barn (Figure 1).
This design was not intended to be practical (we will get to that question later) but to provide a test of the idea that cows want to hide around the time of calving.
Cows entered the experimental maternity pen at least two days before calving to ensure they were familiar with both areas. Using video cameras, we recorded where the cows spent their time before and during calving (24 hours per day).
Cows calving at night, when the lights in the barn were off and no staff were present, showed no preference between the two packs. However, cows calving during the daytime showed a strong preference for calving inside the hide.
Of the 16 cows that gave birth during daylight hours, 13 chose the seclusion of the hide. Cows that calved in the hide started to use it about eight hours before calving, likely near the start of labour.
Given these promising results, we wanted to test if cows would seclude themselves from herdmates when housed under more practical conditions.
We used more conventionally sized individual maternity pens that were directly adjacent to a close-up group pen. (This study was in collaboration with researchers at the University of Arhus and took place in Denmark.)
To create both a “covered” and “uncovered” side to the maternity pen, we attached a 1.5-meter-high piece of plywood to half of the front of the pen (facing the close-up group), as well as to both sides (Figure 2).
Again, we video-recorded where cows chose to calve, and again, the preference was clear: Of the 19 cows used in this experiment, 15 (79 percent) calved in the covered side of the pen, and only four calved on the uncovered side.
The final preference study examined flooring properties that are important to cows at the time of calving. More than a decade of research, much of it conducted at UBC, has shown that the bedding surface is the most important determinant of cow comfort for lactating cows.
Cows strongly prefer dry, deep-bedded surfaces, regardless of the type of bedding used. Dry, deep bedding is also the most powerful protective design feature in reducing lameness and especially hock lesions on dairy farms.
Based on this information, we decided to ask indoor-housed Holstein dairy cows which surface they preferred during calving.
In this experiment, we created a maternity pen with three flooring options: concrete, pebble-top rubber mats and 10 cm of sand, each covered with a 15 cm layer of straw. We made a large maternity pen divided into three sections partitioned with wooden boards; each section had a different flooring surface.
Cows were moved into this pen at least 2 days before calving to ensure they had previous experience with each of the flooring types.
After every third cow, the location of each surface was alternated to control for the chance that cows had a preferred side of the pen. Using video cameras, we recorded where cows spent their time the day before calving and where they chose to calve.
Of the 17 cows in the study, 10 calved on sand, six calved on concrete, and one calved on the rubber mats. Cows also generally avoided the rubber mats on the day before calving. These results tell us rubber mats were the least-preferred flooring option for dairy cows when housed in the maternity pen, despite being bedded with a thick layer of straw.
The results of our preference tests indicate that even our modern, indoor-housed dairy cows are looking for a secluded place to calve, perhaps especially in busy barns and during busy times of the day. It was also clear that rubber flooring is not preferred by cows at calving.
The next steps are to determine if there are other benefits to allowing cows to have a preferred maternity pen, such as reduced calving problems like dystocia or stillbirths. For now, we encourage producers to look with fresh eyes at their maternity housing, keeping cow preferences for seclusion in mind. PD
—Excerpts from UBC Research Reports, Vol. 15, No. 1, February 2015
