Melo P C H, Vale W G, Ernane W, Rolim Filho S T, Ribeiro H F L, Reis A N, Sousa J S and Silva A O A 2012: Fixed timed artificial insemination (FTAI) through progestagen (CIDR) of 1^st, 2^nd, 3^rd and 4^th uses in bovine: II. Conception rate related to times of CIDR use, to the semen used, to artificial insemination technician and to farm management. Livestock Research for Rural Development. Volume 24, Article #62. Retrieved , from http://www.lrrd.org/lrrd24/4/melo24062.htm