By Scout Nelson
Many cattle producers associate estrous synchronization with artificial insemination (AI), but it also offers strong benefits when paired with natural service. According to NDSU Extension livestock specialist Lisa Pederson, synchronization improves herd performance by tightening the breeding window.
“There are many production and economic advantages to utilizing synchronization in the cowherd,” said Pederson. “Mainly, it creates a more uniform calf crop.”
Synchronization allows cows two chances to conceive within the first 30 days of breeding, resulting in a tighter calving season. Calves born earlier gain more weight by weaning, giving producers the advantage of larger, more uniform sale groups.
Proper bull-to-cow ratio is critical with natural service. Ratios typically range from 1:16 to 1:25, depending on factors like terrain, water availability, and protocol used. All bulls should be sound and ideally at least 2 years old.
Four synchronization protocols are approved for natural service: 1-shot PG, 7-day CIDR, 14-day CIDR, and 14-day MGA (heifers only). Each differs in labor needs, feed management, and effectiveness based on cycling status.
“MGA must be fed consistently to work properly,” said Lacey Quail, NDSU Extension livestock management specialist. “If feed intake varies, synchronization and pregnancy rates can decline.”
CIDR-based methods work in cows and heifers and are more reliable but require extra handling. Simpler options like 1-shot PG work only if females are already cycling.
Planning is vital, as protocols may begin weeks before bulls are turned out. For example, a 14-day CIDR protocol starting May 4 supports a June 1 breeding start.
“When it comes to synchronization, it’s better to ask questions beforehand than it is to realize a mistake later and worry about how it might impact pregnancy rates that year,” said Quail.
Resources and tools are available at beefrepro.org to help producers succeed.
Photo Credit - gettyimages-diane-kuhl
Categories: North Dakota, Livestock, Beef Cattle