A three-year University of Nebraska trial demonstrates potential benefits of summer calving. The study compared two herds, one with calving dates from mid-March through April and one calving from mid-June through mid-August.
Summer calving produced higher birth weights and lower weaning weights compared with spring calving. Pregnancy rates were similar for both herds. The biggest advantage found in the study was that summer calving reduced hay inputs to maintain the cow herd by 1.5 tons per cow per year.