Wheat, J.D.; Suba, M.S.; Dayton, A.D.; Hines, R.H.; Allee, G.L.
(Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1983)
The average for 1813 farrowing intervals was 16.78 minutes with a standard deviation of 25.37 minutes. Farrowing duration averaged 141.51 minutes, ranging from 11 to 618 minutes. The difference between farrowing intervals ...