Abecia, J. A., Forcada, F., & González-Bulnes, A. (2011). Pharmaceutical control of reproduction in sheep an d goats. Veterinary Clinics: Food Animal Practice, 27(1): 67-79.
Abecia, J. A., Forcada, F., & González-Bulnes, A. (2012). Hormonal control of reproduction in small ruminants. Animal Reproduction Science, 130(3-4): 173-179.
Ali, A. (2007). Effect of time of eCG administration on follicular response and reproductive performance of FGA-treated Ossimi ewes. Small Ruminant Research, 72(1): 33-37.
Boland, M. P., Crosby, T. F., & Gordon, I. (1981). Effect of mating management and PMSG dose on lambing outcome in ewes bred in late anoestrus. The Journal of Agricultural Science, 97(2): 445-447.
Bragança, J. F. M., Drissen, R. O., Machado, S. A., Bennemann, P. E., & da Rocha, R. X. (2019). Efficacy of the re-utilization of an ear implant impregnated with progestogen in estrus synchronization response and pregnancy in sheep. Tropical Animal Health and Production, 51(6): 1763-1765.
Dutt, R. H. (1953). Induction of estrus and ovulation in anestrual ewes by use of progesterone and pregnant mare serum. Journal of Animal Science, 12(3): 515-523.
Evans, G., & Maxwell, W. C. (1987). Salamons' Artificial Insemination of Sheep and Goats (No. Ed. 2). Butterworth-Heinemann.
Farrag, B., El-Hawy, A. S., El-Bassiony, M. F., El-Rayes, M. A. H., & Shedeed, H. A. (2018). Influence of short-and long-term administration of Melengestrol acetate on estrus activity and reproductive performance of nulliparous Barki ewes. International Journal of Environment, Agriculture and Biotechnology, 3(4): 264403.
Gharibi, S., Niasari-Naslaji, A., Poursasan, N., & Moosavi-Movahedi, A. A. (2014). Replacement of Salamon with Shotor diluent and egg yolk with low density lipoprotein for chilled storage of ram semen. Iranian Journal of Veterinary Research, 15: 279-284.
Godfrey, R. W., Gray, M. L., & Collins, J. R. (1997). A comparison of two methods of oestrous synchronisation of hair sheep in the tropics. Animal Reproduction Science, 47(1-2): 99-106.
Greyling, J. P. C., & Brink, W. C. J. (1987). Synchronization of oestrus in sheep: The use of controlled internal drug release (CIDR) dispensers. South African Journal of Animal Science, 17(3): 128-132.
Greyling, J. P. C., Kotze, W. F., Taylor, G. J., Hagendijk, W. J., & Cloete, F. (1994). Synchronization of oestrus in sheep: use of different doses of progestagen outside the normal breeding season. South African Journal of Animal Science, 24(1): 33-37.
Hashemi, M., Safdarian, M., & Kafi, M. (2006). Estrous response to synchronization of estrus using different progesterone treatments outside the natural breeding season in ewes. Small Ruminant Research, 65(3): 279-283.
Hill, J. R., Thompson, J. A., & Perkins, N. R. (1998). Factors affecting pregnancy rates following laparoscopic insemination of 28,447 Merino ewes under commercial conditions: a survey. Theriogenology, 49(4): 697-709.
Koyuncu, M., & Ozis Alticekic, S. (2010). Effects of progestagen and PMSG on estrous synchronization and fertility in Kivircik ewes during natural breeding season. Asian-Australasian Journal of Animal Sciences, 23(3): 308-311.
López-García, S., Sánchez-Torres, M. T., Cordero-Mora, J. L., Figueroa-Velasco, J. L., Martínez-Aispuro, J. A., García-Cué, J. L., & Cárdenas-León, M. (2021). Estrous synchronization in sheep with reused progesterone devices and eCG. Revista Brasileira de Zootecnia, 50.
Manes, J., Hozbor, F., Alberio, R., & Ungerfeld, R. (2014). Intravaginal placebo sponges affect negatively the conception rate in sheep. Small Ruminant Research, 120(1): 108-111.
Martinez-Ros, P., Lozano, M., Hernandez, F., Tirado, A., Rios-Abellan, A., López-Mendoza, M. C., & Gonzalez-Bulnes, A. (2018). Intravaginal device-type and treatment-length for ovine estrus synchronization modify vaginal mucus and microbiota and affect fertility. Animals, 8(12): 226.
Moakhar, H. K., Kohram, H., Shahneh, A. Z., & Saberifar, T. (2012). Ovarian response and pregnancy rate following different doses of eCG treatment in Chall ewes. Small Ruminant Research, 102(1): 63-67.
Najafi, G., Cedden, F., & Maleki, S. (2014). The determination of plasma progesterone, estradiol-17β hormone levels in Ghezel sheep treated with CIDR and various doses of PMSG during the breeding season. Bulletin of Environment, Pharmacology and Life Sciences, 3(3): 118-122.
Niasari-Naslaji, A., & Soukhtezari, A. (2005). Comparison between three estrus synchronization programs using progestagens during the breeding season in the ewe. Pajouhesh Sazandegi, 65: 86-91.
Noakes, D. E., Parkinson, T. J., & England, G. C. (2018). Puberty and seasonality. In: Veterinary Reproduction and Obstetrics. (10th ed). Elsevier Health Sciences. P. 54-62.
Petrović, M. P., Caro Petrović, V., Ružić-Muslić, D., Maksimović, N., Ilić, Z. Z., Milošević, B., & Stojković, J. (2012). Some important factors affecting fertility in sheep. Biotechnology in Animal Husbandry, 28(3): 517-528.
Rastegarnia, A., & Heydari. H. (2010). Oestrus synchronization in ewes with Fluorogestone acetate out of breeding season. Journal of Large Animal Clinical Science Research, 4(11): 21-30.
Safdarian, M., Kafi, M., & Hashemi, M. (2006). Reproductive performance of Karakul ewes following different oestrous synchronisation treatments outside the natural breeding season. South African Journal of Animal Science, 36(4): 229-234.
Sareminejad, P., Tabatabaei Vakili, S., Mamouei, M., Mirzadeh, Kh., & Boujarpour, M. (2015). Status of estrus and blood serum estrogen and progesterone in Arabic ewes synchronized with CIDR in non-breeding season. Journal of Animal Science and Research, 25(1): 151-161.
SAS, Statistical Analysis System. (2012). User’s Guide, version 9.4. SAS Institute, Cary, NC.
Seidi-Samani, H., Niasari-Naslaji, A., Vojgani, M., Ganjkhanlou, M., Alijani, A., Baninajjar, M. (2023). Synchronization of estrus using progesterone injections followed by hMG in ewes. Veterinary Research Forum, 14 (3): 145-151.
Skliarov, P., Pérez, C., Petrusha, V., Fedorenko, S., & Bilyi, D. (2021). Induction and synchronization of oestrus in sheep and goats. Journal of Central European Agriculture, 22(1): 39-53.
Swelum, A. A. A., Alowaimer, A. N., & Abouheif, M. A. (2015). Use of fluorogestone acetate sponges or controlled internal drug release for estrus synchronization in ewes: Effects of hormonal profiles and reproductive performance. Theriogenology, 84(4): 498-503.
Youngquist, R.S., & Threlfall, W.R. (2007). Current Therapy in Large Animal Theriogenology. (2 nd ed). Saunders Elsevier. Philadelphia, USA. p. 642-704.