Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SOEDE NM,"Periovulatory profiles of oestradiol, LH, and progesterone in relation to oestrus and embryonic mortality in multiparous sows using transrectal ultrasonography to detect ovulation",J Reprod Fertil,,,1994,101,,633-641,https://cir.nii.ac.jp/crid/1573387449089232000,