Newton, E.A.; Stevenson, J.S.; Minton, J.E.; Davis, D.L.
(Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1986)
Eighteen sows were treated as follows: 1) 10 multiparous and four primiparous sows were separated from their litters for 6 hr/day and exposed to a mature boar for 1 hr/day during the last 8 days of lactation, and 2) four ...