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Parturient Behaviour of Primiparous and Multiparous Dairy Cows Kept in Loose-housing

Jens Jung

出版	Sveriges Lantbruksuniversitet, Institutionen för husdjurshygien, 1994
URL	http://books.google.com.hk/books?id=nwXqGwAACAAJ&hl=&source=gbs_api