title: Occurrence of two phases of return to oestrus in sows on commercial units.
authors: Ministry of Agriculture, Fisheries and Food, Reading Cattle Breeding Centre, Shinfield.
authors: C E
authors: CE
authors: Glossop
authors: J A
authors: JA
authors: Foulkes
mesh_terms: D000818:Animals; D004971:Estrus / Q000502:physiology*; D005260:Female; D013552:Swine / Q000502:physiology*; D013997:Time Factors