Optimization of conception rate of beef cows with fix time artificial insemination estrus synchronization by modified Co-synch
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Abstract
The purpose of this study was to compare conception rate in estrus synchronization fix timed artificial insemination beef cows with GnRH plus PGF2α with and without controlled internal drug release (CIDR). A total of 60 cross breed beef cows were used, using a randomized complete block design (RCBD). The beef cows were divided into 3 groups, namely, the experiment 1 was the control group, experiment 2 was estrus synchronization by the Co-sync program, and experiment 3 was the Co-sync estrus CIDR. The pregnant beef cows were examined at 60 days after artificial insemination. The results showed that the conception rate of experiment 2 (65.0 %) and experiment 3 (70.0 %). There was no significantly in estrus synchronization with GnRH plus PGF2α between with and without CIDR (p>0.05) compared to beef cows in experiment 1 had a higher conception rate significantly (p<0.05) Therefore, the study concluded that the combined use of the Co-sync program with intravaginal progesterone in beef cows increased the conception rate. Therefore, it is used as an alternative to using fix time artificial insemination estrus synchronization program in addition to the usual methods of artificial insemination.
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Carvalho, J.B.P., Carvalho, N.A.T., Reis, E.L., Nichi, M., Souza, A.H., & Baruselli, P.S. (2010). Effect of early luteolysis in progesterone-based timed AI protocols in Bos indicus, Bos indicus x Bos taurus, and Bos taurus heifers. Theriogenology, 69(2), 167-175. doi:10.1016/j.theriogenology.2007.08.035
Dejarnette, J. M., Day, M. L., House, R. B., Wallace, R. A., & Marshall, C. E. (2001). Effect of GnRH pretreatment on reproductive performance of postpartum suckled beef cows following synchronization of estrus using GnRH and PGF2alpha. Journal of Animal Science, 79(7), 1675. doi:10.2527/2001.7971675x
Information and communication technology center, Department of Livestock Development. (2021). Database system for farmers. Accessed June 15, 2021. Retrieved from http://ict.dld.go.th/webnew/images/ stories/stat_web/yearly. (in Thai)
Information and communication technology center, Department of Livestock Development. (2020). Database system for farmers. Accessed April 17, 2020. Retrieved from http://ict.dld.go.th/webnew/images/ stories/stat_web/yearly. (in Thai)
El-Zarkouny, S. Z., Cartmill, J. A., Hensley, B. A., & Stevenson, J. S. (2004). Pregnancy in dairy cows after synchronized ovulation regimens with or without presynchronization and progesterone. Journal of Dairy Science, 87(4), 1024–1037. doi:10.3168/jds.s0022-0302(04)73248-8
Ferguson, J. D., Galligan, D. T., & Thomsen, N. (1994). Principal descriptors of body condition score in Holstein cows. Journal of Dairy Science, 77(9), 2695–2703. doi:10.3168/jds.s0022-0302(94)77212-x
Escalante, R. C., Poock, S. E., & Lucy, M. C. (2013). Follicular populations and luteal function in dairy heifers treated with a controlled internal drug release insert for 14 days as a method to synchronize the estrous cycle before prostaglandin PGF2α treatment and artificial insemination. Journal of Dairy Science, 96(6), 3806–3816. doi:10.3168/jds.2012-6474
Kogram, N., Bunma, T., & Navanukraw, C. (2018). Requirement of GnRH injection with CIDR® insertion for synchronization of estrus and follicular development in crossbred brahman× native heifers. Journal of Agricultural Research and Extension, 35(2 Suppl. 2), 290-297. (in Thai)
Rodgers, J. C., Bird, S. L., Larson, J. E., Dilorenzo, N., Dahlen, C. R., DiCostanzo, A., & Lamb, G. C. (2012). An economic evaluation of estrous synchronization and timed artificial insemination in suckled beef cows. Journal of Animal Science, 90(11), 4055–4062. doi:10.2527/jas.2011-4836
Rich, J.J., Northrop, E. J., Larimore, E. L., & Perry, G. A. (2018). Influence of GnRH supplementation at CIDR removal on estrus expression and interval to estrus in beef cattle. Theriogenology. 119, 76-79.
Sajapitak, S., Yawongsa, A,. & Arunvipas P. (2015). Estrus synchronization and fixed-time artificial insemination using combined progesterone and prostaglandin F2 alpha together with hCG, or GnRH in cross-bred Indu-Brazil beef cows. Journal of Kasetsart Veterinarians, 25(3), 115-122. (in Thai)
Santos, J. E. P., Narciso, C. D., Rivera, F., Thatcher, W. W., & Chebel, R. C. (2010). Effect of reducing the period of follicle dominance in a timed artificial insemination protocol on reproduction of dairy cows. Journal of Dairy Science, 93(7), 2976–2988. doi:10.3168/jds.2009-2870
Small, J.A., Ambrose, J.D., McCaughey, W.P., Ward, D.R., Sutherland W.D., Glover, N.D., & Rajamahendran R. (2001). The effects of gonadotropin releasing hormone in prostaglandin PGF2α -based timed insemination programs for beef cattle. Canadian Journal of Animal Science, 81(3), 335-343.
