Document Type : Short Communication
Faculty of Agricultural and Veterinary Sciences, Veterinary Medicine Program, University of Santander, Bucaramanga, Colombia
The creole breed Blanco Orejinegro (Bos taurus adapted) is an important animal genetic resource in Colombia. However, very little is known about the reproductive physiology of the breed. The objective was to determine the dynamics of progesterone circulation and follicular growth in Blanco Orejinegro cows throughout the estrous cycle. Fifteen cyclic Blanco Orejinegro cows were used and subjected to hormonal protocol for estrous and ovulation synchronization. Once the time of ovulation was identified by monitoring the ovarian dynamics with ultrasonography equipment. For description of the results, the mean was used as a measure of central tendency and the standard error of the mean. Statistical analysis was longitudinal descriptive. Blood samples were collected every 24 hr throughout the estrous cycle for serum quantification of progesterone (P4), monitoring of corpus luteum (CL) growth dynamics and follicular dynamics. It was possible to verify that 76.92% of the Blanco Orejinegro cows presented two follicular waves during the estrous cycle and the highest circulating levels of P4 (> 6.00 ng mL-1) were observed on the 14th day of the estrous cycle. It was concluded that the creole cows of the Blanco Orejinegro breed presented two follicular waves per estrous cycle. In addition to, the size of the CL was consistent with the secretion of progesterone presenting higher circulating levels at the end of the luteal phase.
- Domestic animal diversity information system (DAD-IS). Food and Agriculture Organization of the United Nations (FAO) [Spanish]. Available at: http://www. fao.org/dad-is/browse-by-country-and-species/es/. Accessed December 7, 2021.
- Martinez CG. The Colombian cattle breeds. In proceedings: Third global conference on conservation of domestic animal genetic resources. Ontario, Canada 1995; 161-166.
- Lonergan P, Sánchez JM. Symposium review: Progesterone effects on early embryo development in cattle. J Dairy Sci 2020; 103(9): 8698-8707.
- Evans AC, Mossa F, Walsh SW, et al. Effects of maternal environment during gestation on ovarian folliculo-genesis and consequences for fertility in bovine off-spring. Reprod Domest Anim 2012; 47(Suppl 4): 31-37.
- Velazquez MA. The role of nutritional supplementation on the outcome of superovulation in cattle. Anim Reprod Sci 2011; 126(1-2): 1-10.
- Stevenson JS, Sauls JA, Mendonça LGD, et al. Dose frequency of prostaglandin F2α administration to dairy cows exposed to presynchronization and either 5- or 7-day Ovsynch program durations: ovulatory and luteolytic risks. J Dairy Sci 2018; 101(10): 9575-9590.
- Diskin MG, Austin EJ, Roche JF. Exogenous hormonal manipulation of ovarian activity in cattle. Domest Anim Endocrinol 2002; 23(1-2): 211-228.
- Quezada-Casasola A, Avendaño-Reyes L, Macías-Cruz U, et al. Estrous behavior, ovarian dynamics, and progesterone secretion in Criollo cattle during estrous cycles with two and three follicular waves. Trop Anim Health Prod 2014; 46: 675-684.
- Townson DH, Tsang PC, Butler WR, et al. Relationship of fertility to ovarian follicular waves before breeding in dairy cows. J Anim Sci 2002; 80(4): 1053-1058.
- Mollo MR, Rumpf R, Martins AC, et al. Ovarian function in Nelore heifers under low or high feed intake (Abstract). Acta Sci Vet 2007; 35(Suppl 3):958.
- Zeitoun MM, Rodriguez HF, Randel RD. Effect of season on ovarian follicular dynamics in Brahman cows. Theriogenology 1996; 45(8): 1577-1581.
- Viana JHM, Ferreira AM, Sá WF, et al. Follicular dynamics in zebu cattle. Pesq Agropec Bras 2000; 35: 2501-2509.
- Ginther OJ, Bashir ST, Hoffman MM, et al. Endocrinology of number of follicular waves per estrous cycle and contralateral or ipsilateral relation-ship between corpus luteum and preovulatory follicle in heifers. Domest Anim Endocrinol 2013; 45(2): 64-71.
- Ginther OJ, Bergfelt DR, Beg MA, et al. Follicle selection in cattle: role of luteinizing hormone. Biol Reprod 2001; 64(1): 197-205.
- Sartorelli ES, Carvalho LM, Bergfelt DR, et al. Morphological characterization of follicle deviation in Nelore (Bos indicus) heifers and cows. Theriogenology 2005; 63(9): 2382-2394.
- Castilho C, Garcia JM, Renesto A, et al. Follicular dynamics and plasma FSH and progesterone concentrations during follicular deviation in the first post-ovulatory wave in Nelore (Bos indicus) heifers. Anim Reprod Sci 2007; 98(3-4): 189-196.
- Ginther OJ, Wiltbank MC, Fricke PM, et al. Selection of the dominant follicle in cattle. Biol Reprod 1996; 55(6): 1187-1194.
- Utt MD, Jousan FD, Beal WE. The effects of varying the internal from follicular wave emergence to progestin withdrawal on follicular dynamics and the synchro of estrous in beef cattle. J Anim Sci 2003; 81(6): 1562-1567.
- Cerri RLA, Chebel RC, Rivera F, et al. Concentration of progesterone during the development of the ovulatory follicle: II. Ovarian and uterine responses. J Dairy Sci 2011; 94(7): 3352-3365.
- Grajales H, Hernández A, Prieto E. Progesterone levels during the normal and silent cycle in cattle in the Colombian tropics [Spanish]. Rev MVZ Cordoba 2010; 15(2): 2060-2069.