Controlled Reproduction in Sheep and Goats
http://www.amazon.co.uk/Controlled-Reproduction-Sheep-Goats-Animals/dp/0851991157/ref=sr_1_sc_1?s=books&ie=UTF8&qid=1340005870&sr=1-1-spell
Essentials of Domestic Animal Embryology
http://www.amazon.co.uk/Essentials-Domestic-Animal-Embryology-Hyttel/dp/0702028991/ref=sr_1_sc_1?s=books&ie=UTF8&qid=1340005962&sr=1-1-spell
Reproduction in Domestic Ruminants: v. 7
http://www.amazon.co.uk/Reproduction-Domestic-Ruminants-Society-Fertility/dp/1907284141/ref=sr_1_6?s=books&ie=UTF8&qid=1340006084&sr=1-6