Managing Animals with Precision
Each animal’s growth, development, reproduction, and well-being is critically important for a profitable enterprise. Precision farming allows producers to monitor individual animal feed consumption, movement, temperature, sickness, weight, and other factors—often without any human intervention.
How Cows Spend Their Time
In a pasture in Woodward, Oklahoma, cattle wear collars equipped with solar panel wings that relay a summary of each animal’s movement to a satellite. Scientists at the Agricultural Research Service (ARS) Southern Plains Range Research Station use the data to track the cattle.
“In addition to daily summary data, the collars record hourly location data and 5-minute activity data that can be downloaded via radio communications to a computer,” says rangeland management specialist Corey Moffet. “The data allows us to analyze a cow’s behavior—where and how much time the animal spends resting, walking, and grazing.”
The collared cows wander in six pastures, along with their calves, a bull, and uncollared cows. They have access to fresh water and occasionally hay, and they are fed range cube (high protein) supplements five times a week. The data is used to measure the animals’ activity, which is then used to estimate the amount of body mass change in a cow and her calf—whether they are gaining or losing weight, Moffet says.
“Until recently, we’ve only looked at mean averages for groups of animals,” says the lab’s research leader Stacey Gunter. “With precision agriculture, we’re able to look at individuals and know what each one is doing.”
Scientists are also testing a commercial system, “GreenFeed,” which measures an animal’s carbon dioxide, methane emission, and oxygen consumption, Gunter says. Their preliminary research looks at the effects of different feed treatments on a cow’s energy metabolism—converting its feed and forage into energy for growth and movement.
A Closer Look at Feeding Behavior
On a winter morning in Miles City, Montana, some cows wait for ranch hands to arrive and feed them, while others eat as much protein supplement as they want before heading out to pasture.
Scientists at the ARS Range and Livestock Research Unit want to know if feed management affects a cow’s behavior. “Lifetime productivity is a cow’s most important economic trait,” says research leader Mark Petersen. “We want to find out what traits a cow possesses that allow her to be long living and highly productive—giving birth to a calf each year.”
Cows visit a feeding station that measures
carbon dioxide and methane emissions and
oxygen consumption. (Stacey Gunter,
In initial trials, Petersen, animal scientist Andrew Roberts, and their team looked at the influence of self-feeding versus traditional supplement hand feeding in winter on the activity patterns of rangeland heifers. One group of heifers was hand fed protein supplements daily. Another group had access to supplements and could choose how much they wanted to eat and when. The average consumption for each animal was about one-half pound per day.
A critical challenge facing livestock production systems in the western United States is to implement management practices that optimize beef production while conserving rangeland resources, Petersen says. “How we provided those supplements changed the animals' behavior as to how they used the pasture,” he says. Hand-fed animals spent the first hour of the morning waiting for the feed truck and didn’t graze. Self-fed heifers ate supplement when they wanted, and as much as they wanted, and they grazed when they desired.
“Usage of forage and pasture area was remarkably different, depending on the management scheme,” Petersen says. “Self-fed cows grazed the entire pasture area, whereas hand-fed animals only used 60 percent of the pasture.”
Cows are fitted with collars similar to the ones used in Oklahoma that give GPS coordinates every 5 minutes and daily location summaries. Scientists calculate how fast cows are traveling and then assign various behaviors, such as whether an animal is resting, grazing, or walking.
“So far, we’ve learned with GPS collar data analysis that relatively small changes in common beef herd management practices have measurable impacts on how animals use rangeland pastures,” Petersen says. “This is significant, because the environmental footprint of rangeland beef production is related to how animal impact is spread out across the landscape.”
ARS scientists, along with New Mexico State University collaborators, furthered the research by developing vegetation maps from satellite images that tell where cows are spending their time. Scientists believe the data will show that heifers prefer certain types of vegetation.
“We might be able to use precision agriculture to help producers better manage their herds by manipulating how the animals use pastures to benefit productivity as well as the land,” Petersen says.
Piglets with sow. (Stephen Ausmus, D3097-3)
Precision for Pigs
In swine operations, precision farming technology can be a welcome tool for continuous monitoring of an animal’s performance, health, and welfare.
Technology can help producers figure out what’s going on with pigs and whether to make management adjustments, such as changes in feed ration or pen size. It can also help them locate sick animals.
“It can be difficult to detect when just one animal is sick,” says Tami Brown-Brandl, an agricultural engineer at ARS’s Roman L. Hruska U.S. Meat Animal Research Center (USMARC) in Clay Center, Nebraska. With precision farming, “theoretically, you could detect and treat sick animals sooner and with more accuracy than you could visually. We are using individual animal time at the feeder to predict the next day’s time at the feeder. If the prediction and the actual are too far apart, then we investigate the cause.”
Another use for precision agriculture is marketing pigs, she says. Packers want pigs at current market weight. The traditional weighing method—running pigs over a scale—is very time consuming for a large number of pigs. Brown-Brandl and her colleagues are developing imaging methods to measure a pig’s weight. They determine the pig’s volume from the pixels in the digital image, and then they use equations to convert volume into weight. She says the error rate is only about 5 percent. “You could put an ink mark on pigs that are market weight and above, so they could be easily sorted,” she says.
They’re also using imaging to prevent sows from crushing their piglets. A 3-D camera, mounted over farrowing crates, takes images used to determine a sow’s posture: whether she’s eating, drinking, standing, sitting, or lying with her udder facing right or left.
“This allows us to evaluate different sizes of farrowing crates and give management recommendations to producers,” Brown-Brandl says.
Beating Back Heat Stress
To alert producers to potentially dangerous heat-stress conditions, Brown-Brandl and colleagues designed and launched a smartphone “Heat Stress” app for cattle in 2016. The app uses weather service data to issue forecasts 1 to 7 days in advance of extreme heat conditions, and it provides recommendations for protecting animals before and during a heat-stress event. So far, the app has been downloaded about 1,500 times.
USMARC researchers also are looking at heat tolerance in pigs. Annual losses associated with heat stress in the U.S. pig industry are estimated at nearly $300 million.
“Heat stress causes a thermal imbalance—the animal produces more heat than can be dispersed in the environment,” Brown-Brandl says. In pigs, heat stress can decrease feed intake, growth, feed efficiency, and reproductive rate.
In earlier research, Brown-Brandl and her team used skin surface temperatures of individual and groups of pigs to determine appropriate temperatures for housing them. Thermal images were taken of 160 group-penned pigs and 20 individual pigs on specific days within a certain temperature range. Scientists found that the use of thermal images showed promise in determining heat tolerance for pigs.
ARS scientists continue to investigate the use of precision agriculture technology to benefit animal production and health. Their research includes testing and developing methods to help farmers operate more efficiently in managing production costs and increasing production and profits.—By Sandra Avant, ARS Office of Communications.