Increasing the reproductive efficiency of dairy cattle by getting the highest possible number of cows pregnant in the same period of time has always been a challenge for the industry. Ohio State University specialists are working to reverse this trend through the development of new reproduction techniques and training that emphasizes proper management.
Currently, the national pregnancy rate for dairy cows is only 16 percent, while the benchmark rate set by industry experts is 10 points higher, said Gustavo Schuenemann, Ohio State University Extension's state dairy veterinarian. Ohio's rate is about the national average, he said, noting there is "room for improvement."
Lower pregnancy rates are an issue for the dairy industry because they translate into reduced herd growth and potential loss of profits, said Mike Day, an animal scientist with the university's Ohio Agricultural Research and Development Center (OARDC).
"Dairy cows work hard every day," he said. "That makes it more difficult for farmers to increase reproduction rates."
One way to boost dairy farm reproduction efforts is the use of artificial insemination (AI) and estrus (heat) synchronization techniques. Working with industry partners, Day and his research team have pioneered a new fixed-time AI protocol, known as "5-day CO-Synch + CIDR", that better synchronizes a cow's estrus cycle so that AI can be administered when cows are more fertile.
A recommended practice within the beef cattle industry nationwide, this protocol has been successfully tested on beef cows, resulting in 60 to 70 percent of animals getting pregnant within one day, a 17.5-percent increase compared to industry standards. Day and colleagues calculated that if 5-day CO-Synch + CIDR were implemented with just 10 percent of Ohio's roughly 500,000 beef and dairy cows, the total economic benefit would easily surpass $5 million in savings and increased production.
This protocol is now being studied in dairy heifers and cows by researchers at various locations across the country, Day said. The hope is that this approach will increase fertility in dairy cattle compared to current protocols, giving farmers another tool to inch closer to their animal reproductive goals.
While technology is an important factor in boosting reproductive efficiency of dairy cattle, it's not the solution by itself, according to OSU Extension's Schuenemann.
"There's no magic bullet," said Schuenemann, who develops and coordinates research-based, practical training workshops for dairy producers, personnel and veterinarians throughout Ohio. "There are many tools out there - from synchronization protocols to heat detection to measuring cow activity - but regardless of the tool a farmer may use, proactive management practices at the farm level matter when it comes to reproduction."