STILLWATER, Okla. — Dairy Month may have ended, but Oklahoma State University dairy research is still going strong.
The overall goal of OSU dairy research is to improve the efficiency of dairy production, according to Department of Animal and Food Sciences researchers Andrew Foote and Leon Spicer.
“Our research is about providing new knowledge and tools needed to help dairy farmers raise healthier cows that produce high-quality milk more efficiently,” Spicer said.
Foote recently submitted the results of a 2019 study to the Journal of Translational Animal Science on improving a dairy cow’s transition into the lactation period. He studied the impacts of using a new hydroxy form of vitamin D in a dairy cow’s diet. When cows begin lactating, they do not get enough calcium, which can have dramatic effects on their immune systems. Producers usually manipulate the minerals in a cow’s diet during the few weeks prior to calving so the animal is better able to absorb calcium.
The vitamin D supplement increased milk production in cows in the first month of production. Researchers are looking into the physiological mechanisms that led to the increased milk production.
Foote will also be presenting results of a 2020 study regarding a dietary supplement for dairy cows on a robotic milking system at the American Society of Animal Science (ASAS) conference this summer.
The OSU Ferguson Family Dairy Center opened a robotic milking system in October 2020. Foote said dietary pellets are used with robotic milking systems to coax dairy cows into the robotic system and to make them stand still while being milked.
The research entailed feeding no pellets to one group of cows, while feeding two different amounts per day to two other groups. The amount each cow ate per day was measured by a feed bunk. Foote said the key is to make sure dairy cows are getting the right amount of starch and protein, so researchers looked at whether feeding the pellets to the dairy cows affected their dietary needs.
Foote said the mixed diet intake of the cows receiving pellets declined significantly, which “told us that when we feed cows the pellets, we likely need to reformulate their mixed diet to make sure we are meeting their protein requirements and not giving them too much starch.”
However, adding the pellets had no negative effects on milk production. Researchers will follow up with altered mixed rations to determine the amount of protein and corn that needs to be present in a cow’s mixed rations when they also consume pellets. There will likely be a follow up study to determine how increasing amounts of pellets affect the digestibility of a cow’s diet.
Spicer will be presenting summer 2020 research at the ASAS conference in which he and fellow researchers regularly fed Bacillus subtilis bacteria to dairy cows to determine if it impacted milk production and milk components, such as milk fat and milk protein percentage.
Treated cows showed a 0.5% increase in milk fat from 4% to 4.5%.
“We calculated that this would be a $236 increase in gross income per cow per lactation or a $23,607 per 100 cow herd increase in gross income per year,” Spicer said. “The other important aspect we found was their feed efficiency increased. They were eating less food to produce the same amount of milk as the non-treated cows.”
In upcoming dairy research, Spicer will be teaming up with OSU’s College of Veterinary Medicine faculty to look at an electrolyte water additive to see how it might impact milk production and feed intake. The study will be conducted in the heat of the summer to see how cows are affected in a more stressful environment.
–Alisa Boswell-Gore
Oklahoma State University
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