@phdthesis{oai:tsukuba.repo.nii.ac.jp:00028032,
 author = {石井, 貴茂},
 month = {},
 note = {2011},
 school = {筑波大学, University of Tsukuba},
 title = {乳用育成牛における初産分娩月齢の早期化に関する栄養学的研究},
 year = {2012}
}