1Blanchard TL, Varner DD, Schumacher J, Love CC, Brinsko SP, et al. (2003) Manual of Equine Reproduction (2nd Edn) Mosby Elsevier, USA.
2McDonnell SM (2003) Mare behavior problems. Current Therapy in Equine Medicine Robinson EN (ed.), Elsevier Science, New York, USA.
3Neely DP (1989) Progesterone/progestin therapy in the broodmare. American Association of Equine Practitioners Conference, San Francisco, California, USA.
4Squires EL, Stevens WB, McGlothlin DE, Pickett BW (1979) Effect of an oral progestin on the estrous cycle and fertility of mares. J Anim Sci 49:729-35.
5 Neely DP (1983) Hormone therapy in mares.Equine Reproduction, Neely DP, Liu IKM, Hillman RB (eds.), Chatham, New Jersey, USA.
6McKinnon AO, Lescun TB, Walker JH, Vasey JR, Allen WR (2000) The inability of some synthetic progestogensto maintain pregnancy in the mare. Equine Vet J 32: 83-5.
7Scheffrahn NS, Wiseman BS, Vincent DL, Harrison PC, Kesler DJ (1982)Reproductive hormone secretions in pony mares subsequent to ovulation control during late winter. Theriogenology 17:571-85.
8 McCue PM, Lemons BA, Squires EL, Vanderwall DK (1997)Efficacy of Synovex-S® implants in suppression of estrus in the mare. J Equine Vet Sci 17: 327-9.
9BET Pharm (2004) P4 LA200 mg/mL BioRelease®. Lexington, Kentucky, USA.
10Gupta PK, Mehta RC, Douglas RH, DeLuca PP (1992) In vivo evaluation of biodegradable progesterone microspheres in mares. Pharmaceut Res 9: 1502-6.
11Ball BA, Wilker C, Daels PF, Burns PJ (1992)Use of progesterone in microspheres for maintenance of pregnancy in mares. Am J Vet Res 53: 1294-7.
12Gόrecka A, Jezirski TA, Sloniewski K (2005) < Relationships between sexual behavior, dominant follicle area, uterus ultrasonic image and pregnancy rate in mares of two breeds differing in reproductive efficiency. Anim Reprod Sci 87: 283-93.
13Reimers TJ, Lamb SV, Bartlett SA, Matamoros RA, Cowan RG, et al. (1991) Effect of hemolysis and storage on quantification of hormones in blood samples from dogs, cattle and horses. Am J Vet Res 52: 1075-80.
14Loy RG, Swan SM (1966) Effects of exogenous progestogens on reproductive phenomena in mares. J Anim Sci 25: 821-6.
15Munro CD, Renton JP, Butcher R (1979) The control of oestrousbehaviour in the mare. J Reprod FertilSuppl 27: 217-79.
16Booth LC, Oxender WD, Douglas RH, Woodley SL (1980) Estrus, ovulation, and serum hormones in mares given prostaglandin F2 alpha, estradiol, and gonadotropin releasing hormone. Am J Vet Res 41: 120-2.
17Loy RG, Pemstein R, O’Canna D, Douglas RH (1981) Control of ovulation in cycling mares with ovarian steroids and progstaglandin. Theriogenology 15: 191-200.
18Vanderwall DK, Marquardt JL, Woods GL (2007) Use of a compounded long-acting progesterone formulation for equine pregnancy maintenance. J Equine Vet Sci 27: 62-6.