References

Acevedo, N., C.S. Galina, A. Pulido and A. Orihuela, 2007. Dynamics in sexually active groups of Zebu cattle (Bos indicus) comparing two procedures for estrus induction. Vet. Behav., 2: 5-9.
CrossRef  |  

Bartolome, J.A., A. Sozzi, J. McHale, P. Melendez and A.C. Arteche et al., 2005. Resynchronization of ovulation and timed insemination in lactating dairy cows, II: Assigning protocols according to stages of the estrous cycle, or presence of ovarian cysts or anestrus. Theriogenology, 63: 1628-1642.
CrossRef  |  PubMed  |  Direct Link  |  

Beal, W.B., 1983. A note on synchronization of oestrus in post-partum cows with prostaglandin F_2α and a progesterone-releasing device. Anim. Prod., 37: 305-308.
CrossRef  |  

Bo, G.A., P.S. Barusselli and M.F. Martinez, 2003. Pattern and manipulation of follicular development in Bos indicus cattle. Anim. Reprod. Sci., 78: 307-326.
PubMed  |  Direct Link  |  

Busch, D.C., D.J. Schafer, D.J. Wilson, D.A. Mallory and N.R. Leitman et al., 2008. Timing of artificial insemination in postpartum beef cows following administration of the CO-Synch + controlled internal drug-release protocol. J. Anim. Sci., 86: 1519-1525.
PubMed  |  

Cavalieri, J. and K.L. Macmillan, 2002. Synchronisation of oestrus and reproductive performance of dairy cows following administration of oestradiol benzoate or gonadotrophin releasing hormone during a synchronised pro-oestrus. Aust. Vet. J., 80: 486-493.
CrossRef  |  

Cavalieri, J., G. Hepworth and L.A. Fitzpatrick, 2004. Comparison of two estrus synchronization and resynchronization treatments in lactating dairy cows. Theriogenology, 62: 729-747.
CrossRef  |  

Cavalieri, J., V.E. Eagles, M. Ryan and K.L. Macmillan, 2000. Patterns of onset of oestrus and reproductive performance of dairy cows enrolled in controlled breeding programs. Proceedings of the Australian and New Zealand Combined Dairy Veterinarians Conference, May 15-19, 2000, Vanuatu, pp: 161-182.

Cavalieri, J., V.M. Smart, G. Hepworth, M. Ryan and K.L. Macmillan, 2008. Ovarian follicular development and hormone concentrations in inseminated dairy cows with resynchronized estrous cycles. Theriogenology, 70: 946-955.
PubMed  |  

Chenault, J.R., J.F. Boucher, K.J. Dame, J.A. Meyer and S.L. Wood-Follis, 2003. Intravaginal progesterone insert to synchronize return to estrus of previously inseminated dairy cows. Dairy Sci., 86: 2039-2049.
PubMed  |  

Eagles, V.E., J. Malmo and K.L. Macmillan, 2001. Resynchronising returns-to-service in anoestrous cows in Victorian dairy herds. Proc. N. Zealand Soc. Anim. Prod., 61: 176-179.
Direct Link  |  

Fatehi, J. and L.R. Schaeffer, 2003. Data management for the fertility project. Report to the Technical Committee of the Canadian Genetic Evaluation Board. Department of Animal and Poultry Science, University of Guelph, Canada, pp: 1-15.

Galina, C.S. and G.H. Arthur, 1990. Review on cattle reproduction in the tropics. Part 4. Oestrous cycles. Anim. Breed. Abstr., 58: 697-707.
Direct Link  |  

Houghton, P.L., R.P. Lemenager, K.S. Hendrix, G.E. Moss and T.S. Stewart, 1990. Effects of body composition, pre- and postpartum energy intake and stage of production of energy utilization by beef cows. J. Anim. Sci., 68: 1447-1456.
PubMed  |  

Jainudeen, M.R. and E.S.E. Hafez, 2000. Reproductive Failure in Females. In: Reproduction in Farm Animals, Hafez, E.S.E. and B. Hafez (Eds.). 7th Edn., Lippincott Williams and Wilkins, New York, pp: 261-278.

Kastelic, J.P., S. Curran, R.A. Pierson and O.J. Ginther, 1988. Ultrasonic evaluation of the bovine conceptus. Theriogenology, 29: 39-54.

Krininger, C.E., J. Block, Y.M. Al-Katanani, R.M. Rivera, C.C. Jr. Chase and P.J. Hansen, 2003. Differences between Brahman and Holstein cows in response to estrus synchronization, superovulation and resistance of embryos to heat shock. Anim Reprod. Sci., 78: 13-24.
CrossRef  |  

Lucy, M.C., 2001. Reproductive loss in high-producing dairy cattle: Where will it end. J. Dairy Sci., 84: 1277-1293.
CrossRef  |  Direct Link  |  

McDougall, S. and S.H. Loeffler, 2004. Resynchrony of postpartum dairy cows previously treated for anestrus. Theriogenology, 61: 239-253.
CrossRef  |  

Molina, R., C.S. Galina, M. Maquivar, S. Estrada, A. Chavez and G.S. Diaz, 2003. Pregnancy rate in Zebu cows with two different postpartum intervals exposed to a two-bull rotational system. Vet. Res. Comm., 27: 671-680.
CrossRef  |  

Pierson, R.A. and O.J. Ginther, 1984. Ultrasonography of the bovine ovary. Theriogenology, 21: 495-504.
CrossRef  |  

Rasby, R.J., M.L. Day, S.K. Johnson, J.E. Kinder and J.M. Lynch, 1998. Luteal function and estrus in peripubertal beef heifers treated with an intravaginal progesterone releasing device with or without a subsequent injection of estradiol. Theriogenology, 50: 55-63.
Direct Link  |  

Sheldon, I.M., G.S. Lewis, S. LeBlanc and R.O. Gilbert, 2006. Defining postpartum uterine disease in cattle. Theriogenology, 65: 1516-1530.
CrossRef  |  PubMed  |  Direct Link  |  

Stevenson, J.S., J.A. Cartmill, B.A. Hensley and S.Z. El-Zarkouny, 2003. Conception rates of dairy cows following early not-pregnant diagnosis by utrasonography and subsequent treatments with shortened Ovsynch protocol. Theriogenology, 60: 475-483.

Thatcher, W.W., T.R. Bilby, J.A. Bartolome, F. Silvestre, C.R. Staples and J.E.P. Santos, 2006. Strategies for improving fertility in the modern dairy cow. Theriogenology, 65: 30-44.
CrossRef  |  Direct Link  |  

Toelihere, M.R., T.L. Yusuf and M.B. Taurin, 1980. Artificial Insemination. 6th Edn., Department of Reproduction, Faculty of Veterinary Medicine Institute Pertanian Bogor, Indonesia, pp: 123-140.

Van Cleeff, J., K.L. Macmillan, M. Drost, M.C. Lucy and W.W. Thatcher, 1996. Effects of administering progesterone at selected intervals after insemination of synchronized heifers on pregnancy rates and resynchronization of returns to service. Theriogenology, 46: 1117-1130.
CrossRef  |  

Voh, A.A. Jr., E.O. Oyedipe, V. Buvanendran and J. Kumi-Diaka, 1987. Estrus response of indigenous Nigerian Zebu cows after prostaglandin F₂ α analogue treatment under continuous observations for two seasons. Theriogenology, 28: 77-99.
CrossRef  |  

Wright, P.J. and J. Malmo, 1992. Pharmacological manipulation of fertility. Vet. Clin. North Am. Food Anim. Pract., 8: 57-89.

Yimer, N., Y. Rosnina, H. Wahid, A.A. Saharee, K.C. Yap and P. Ganesamurthi, 2010. Ovarian activity in beef and dairy cows with prolonged postpartum period and heifers that fail to conceive. Trop. Anim. Health Prod., 42: 607-615.
PubMed  |