References
- Ahmad, N., S. W. Beam, W. R. Butler, D. R. Deaver, R. T. Duby, E. Elder, J. E. Fortune, L. C. Griel, L. S. Jones, R. A. Milvae, L. Pate, I. Revah, D. T. Scheriber, D. H. Townson, P. C. W. Tasnag and E. K. Inskeep. 1996. Relationships of fertility to patterns of ovarian follicular development and associated hormonal profiles in dairy cows and heifers. J. Anim. Sci. 74:1943-1952. https://doi.org/10.2527/1996.7481943x
-
Alnimer, M. A. 2005. Comparison of an oestrus synchronization protocol with Oestradiol Benzoate and
$PGF2{\alpha}$ and insemination at detected oestrus to a timed insemination protocol (Ovsynch) on reproductive performance of lactating dairy cows. Reprod. Nutr. Dev. 45:699-708. https://doi.org/10.1051/rnd:2005054 - Alnimer, M. A. and W. Lubbadeh. 2003. Effect of Using Progesterone Releasing Intravaginal Device with Ovsynch Program on Reproduction in Dairy Cattle during Summer Season. Asian-Aust. J. Anim. Sci 16:1268-1273. https://doi.org/10.5713/ajas.2003.1268
- Badinga, L., R. J. Collier, W. W. Thatcher and J. Wilcox. 1985. Effects of climatic and management factors on conception rate in subtropical environment. J. Dairy Sci. 68:78-85. https://doi.org/10.3168/jds.S0022-0302(85)80800-6
- Burke, C. R., M. Mihm, K. L. Macmillan and J. F. Roche. 1994. Some effects of prematurely elevated concentrations of progesterone on luteal and follicular characteristics during the oestrus cycle in heifers. Anim. Reprod. Sci. 35:27-39. https://doi.org/10.1016/0378-4320(94)90004-3
- Butler, W. R. 2000. Nutritional interactions with reproductive performance in dairy cattle. Anim. Reprod. Sci. 60-61:449-457. https://doi.org/10.1016/S0378-4320(00)00076-2
- Chenault, J. R., R. E. Hornish, Y. C. Anderson, L. F. Krabill, J. F. Boucher and M. J. Prough. 2003. Concentrations of progesterone in milk of cows administered an intravaginal progesterone insert. J. Dairy Sci. 86:2050-2060. https://doi.org/10.3168/jds.S0022-0302(03)73794-1
- Dekruif, A. 1978. Factors influencing the fertility of a cattle population. J. Reprod. Fertil. 54:507-518. https://doi.org/10.1530/jrf.0.0540507
- Edmonson, A. J., I. J. Lean, L. D. Weaver, T. Farver and G. Webster. 1989.Abody condition scoring chart for Holstein dairy cows. J. Dairy Sci. 72:68-78. https://doi.org/10.3168/jds.S0022-0302(89)79081-0
- Garrett J. E., R. D. Geisert, M. T. Zavy and G. L. Morgan. 1988. Evidence for maternal recognition of early conceptus growth and development in beef cattle. J. Reprod. Fertil. 84:437-446. https://doi.org/10.1530/jrf.0.0840437
- Heuwieser, W., P. A. Oltenacu, A. J. Lednor and R. H. Foote. 1997. Evaluation of different protocols for prostaglandin synchronization to improve reproductive performance in dairy herds with low estrus detection efficiency. J. Dairy Sci. 80:2766-2774. https://doi.org/10.3168/jds.S0022-0302(97)76239-8
- Jainudeen, M. R. and E. S. E. Hafez. 1993. Reproductive failure in females. In: E. S. E. Hafez, Reproduction in farm animals. 6th Ed., Lea and Febiger, Pheladelphia, 261-311.
- Kimura, M. T., T. Nakao, M. Moriyoshi and K. Kawata. 1987. Luteal phase deficiency as a possible cause of repeat breeding in dairy cows. Br. Vet. J. 143:560. https://doi.org/10.1016/0007-1935(87)90047-9
- Lamming, G. E., A. O. Darwash and H. L. Back. 1989. Corpus luteum function in dairy cows and embryo mortality. J. Reprod. Fertil. Suppl. 37:245-252.
- Lee, C. N., E. Maurice, R. L. Ax, J. A. Ennington, W. F. Aoffman and M. D. Rown. 1983. Efficacy of gonadotropin - releasing hormone administered at the time of artificial insemination of heifers and postpartum and repeat breeder dairy cows. Am. J. Vet. Res. 44:2160-2163.
- Lucy, M. C. 2001. Reproductive loss in high producing dairy cattle: where will it end? J. Dairy Sci. 84:1277-1293. https://doi.org/10.3168/jds.S0022-0302(01)70158-0
- Lynch, P. R., K. L. Macmillan and V. K. Taufa. 1999. Treating cattle with progesterone as well as a GnRH analogue affects estrous cycle length and fertility. Anim. Reprod. Sci. 56:189-200. https://doi.org/10.1016/S0378-4320(99)00044-5
- Macmillan, K. L. and A. J. Peterson. 1993. A new intravaginal progesterone releasing device for cattle (CIDR-B) for oestrus synchronisation, increasing pregnancy rates and the treatment of postpartum anoestrus. Anim. Reprod. Sci. 33:1-25. https://doi.org/10.1016/0378-4320(93)90104-Y
- Mann, G. E. and G. E. Lamming. 1995. Progesterone inhibition of the development of the luteolytic signal in cows. J. Reprod. Fertil. 104:1-5. https://doi.org/10.1530/jrf.0.1040001
- Mann, G. E., G. E. Lamming and M. D. Fray. 1995. Plasma oestradiol and progesterone during early pregnancy in the cow and the effect of treatment with buserelin. Anim. Reprod. Sci. 37:121-131. https://doi.org/10.1016/0378-4320(94)01325-G
-
Mann, G. E., G. E. Lamming, R. S. Robinson and D. C. Wathes. 1998. The regulation of interferon
${\tau}$ production and uterine hormone receptors during early pregnancy. J. Reprod. Fertil. Suppl. 54:317-328. - Mann, G. E., P. Merson, M. D. Fray and G. E. Lamming. 2001. Conception rate following progesterone supplementation after sejk5cond insemination in dairy cows. Vet. J. 162:161-162. https://doi.org/10.1053/tvjl.2001.0595
- Mortimer, R. G, P. W. Farin and R. D. Stevens. 1997. Reproductive examination of the non- pregnant cow (Ed. R. S. Youngquist). Current Therapy in Large Animal Theriogenology. Published By W.B Saunders Co., Philadelphia, USA. pp.268-275.
- National Research Council. 1989. Nutrient Requirements of Dairy Cattle. 5th Ed. National Academy Sci. Washington, DC.
- Robinson, N. A., K. E. Leslie and J. S. Walton. 1989. Effect of treatment with progesterone on pregnancy rate and plasma concentrations of progesterone in Holstein cows. J. Dairy Sci. 72:202-207. https://doi.org/10.3168/jds.S0022-0302(89)79098-6
- Roussel, J. D., J. F. Beatty and K. Koonce. 1988. Gonadotropin releasing hormone therapy in functional infertility of dairy cattle. Theriogenology. 30:1115-1119. https://doi.org/10.1016/0093-691X(88)90286-5
- Royal, M.D., G.E. Mann and A.P.F. Flint. 2000. Strategies for reversing the trend towards subfertility in dairy cattle. Vet. J. 160:53-60. https://doi.org/10.1053/tvjl.1999.0450
- SAS Institute Inc. 1996. SAS/STAT User's Guide: Version 7 Edition. SAS. Institute Inc. Cary NC.
- Shaham- Albalancy, A., Y. Folman, M. Kaim, M. Rosenberg and D. Wolfenson. 2001. Delayed effect of low progesterone concentrations on bovine uterine PGF2alpha secretion in the subsequent oestrus cycle. Reprod. 122:643-648. https://doi.org/10.1530/rep.0.1220643
- Stevenson, J. S. and M. O. Mee. 1991. Pregnancy rates of Holstein cows after postinsemination treatment with a progesteronereleasing intravaginal device. J. Dairy Sci. 74:3849-3856. https://doi.org/10.3168/jds.S0022-0302(91)78577-9
- Thatcher, W. W., F. Moreira, J. E. P. Santos, R. C. Matoyos, F. L. Lopes, S. M. Pancarci and C.A. Risco. 2001. Effects of hormonal treatments on reproductive performance and embryo production. Theriogenol. 55:75-89. https://doi.org/10.1016/S0093-691X(00)00447-7
- Thatcher, M. M., C. R. Staples, G. Desnoyers, D. Oldick and E. P. Shmitt. 1994. Embryo health and mortility in sheep and cattle. J. Anim. Sci. 72(suppl.3):16. https://doi.org/10.2527/1994.72suppl_316x
- Thuemmel, A. E., F. C. Gwazdauskas, W. D. Whittier and M. L. McGilliard. 1992. Effect of progesterone supplementation in repeat breeder cattle on conception and plasma progesterone. J. Endocrinol. Invest. 15:393-396. https://doi.org/10.1007/BF03348762
- Van Cleeff, K. L., M. Drost and W. W. Thatcher. 1991. Effects of post insemination progesterone supplementation on fertility and subsequent estrous responses of dairy heifers. Theriogenol. 36:795-807. https://doi.org/10.1016/0093-691X(91)90345-E
- Villarroel, A., A. Martino, R. H. Don Durant, F. Deleting and W. M. Sischo. 2004. Effect of post insemination supplementation with PRID on pregnancy in repeat- breeder Holstein cows. Theriogenol. 61:1513-1520. https://doi.org/10.1016/j.theriogenology.2003.09.001
- Wathes, D. C. 1992. Embryonic mortality and the uterine environment. J. Endocr. 134:321-325. https://doi.org/10.1677/joe.0.1340321