1 . رضایی رودباری ع، کهرام ح و دیرنده ع (1394). بررسی زیانهای اقتصادی ناشی از تاخیر در آبستنی گاوهای شیری. مجله علوم دامی ایران، دوره 46، شماره 2، 158-151.
2 . Bello NM, Steibel JP and Pursley JR (2006) Optimizing ovulation to first GnRH improved outcomes to each hormonal injection of Ovsynch in lactating dairy cows. Journal of Dairy Science 89: 3413–3424.
3 . Chebel RC, Santos JE, Cerri RL, Rutigliano HM and Bruno RG (2006) Reproduction in dairy cows following progesterone insertpresynchronization and resynchronization protocols. Journal of Dairy Science 89: 4205–4219.
4 . De Vries A (2011) Economics of reproductive performance. In: Risco CA, Melendez Retamal P (eds) Dairy Production Medicine. Ames, IA: Wiley-Blackwell, pp. 139–151.
5 . Dirandeh E, Rezaei Roodbari A, Gholizadeh M, Deldar H, Masoumi R, Kazemifard M and Colazo M (2015) Administration of prostaglandin F2α 14 d before initiating a G6G or a G7G timed-AI protocol increased circulating progesterone prior to AI and reduced pregnancy loss in multiparous Holstein cows. Journal of Dairy Science 98: 5414–5421.
6 . Galvao KN, Santos JE, Cerri RL, Chebel RC, Rutigliano HM, Bruno RG, et al. (2007) Evaluation of methods of resynchronization for insemination in cows of unknown pregnancy status. Journal of Dairy Science 90: 4240–52.
7 . Galvao KN and Santos JEP (2010) Factors affecting synchronization and conception rate after the Ovsynch protocol in lactating Holstein dairy cows. Reproduction in Domestic Animal 45: 439–446.
8 . Kristula M, Bartholomew R, Galligan D and Uhlinger C (1992) Effects of a prostaglandin F2a synchronization program in lactating dairy cattle. Journal of Dairy Science 75: 2713-2718.
9 . LeBlanc S (2007) Economics of improving reproductive performance in dairy herds. WCDS Advance Dairy Technology 19: 201–214.
10 . Moreira F, De la Sota RL, Diaz T and Thatcher WW (2000) Effect of day of the estrous cycle at the initiation of a timed artificial insemination protocol on reproductive responses in dairy heifers. Journal of Animal Science 78: 1568–1576.
11 . Nebel RL and Jobst SM (1998) Evaluation of systematic breeding programs for lactating dairy cows: A Review. Master of science in Dairy Science (Reproductive Physiology and Management. Virginia Polytechnic Institute and State University.
12 . Ribeiro E, Lima F, Ayres H, Greco L, Bisinotto R and Favoreto M (2011) Effect of postpartum diseases on reproduction of grazing dairy cows. Journal of Dairy Science 94 (Suppl.1):63 (Abstract).
13 . Sturman H, Oltenacu E and Foote R (2000). Importance of inseminating only cows in estrus. Theriogenology 53(8): 1657-1667.
14 . Wiltbank M, Sartori R, Herlihy M Vasconcelos JL, Nascimento AB, Souza AH, Ayres H, Cunha AP, Keskin A, Guenther JN and Gumen A (2011) Managing the dominant follicle in lactating dairy cows. Theriogenology 76: 1568–1582.
15 . Xu ZZ (2011). Reproduction, events and management | Control of Estrous Cycles: Synchronization of Ovulation and Insemination. Pages 454-460 in Encyclopedia of Dairy Sciences. C. Editor in, xA, and W. F. John, ed. Academic Press, San Diego.
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