Silva-Mena C, Guzmán-Casas R, Delgado-León R, Aké-López R

Language: Spanish
References: 25
Page: 265-271
PDF size: 32.05 Kb.

ABSTRACT

Introduction. Estrus synchronization is a useful tool for artificial insemination programmes, for improving reproductive management and for grouping animals for service. Information on the procedure in Zebu cattle (Bos indicus) is relatively scarce.
Objective. To evaluate the effect of the treatment with progestagens on estrus presentation, estrus behavior and pregnancy rate in Brahman heifers with natural service.
Materials and methods. Sixty-four Brahman heifers, distributed in four groups (n = 16) were used, as well as four Brahman bulls. Estrus was synchronized with Norgestomet and estradiol valerate, and sexual activity observed during 30 hours among heifers and between heifers and the bull was recorded. Pregnancy was diagnosed 50 to 60 days later.
Results. Percentages of estrus presentation ranged from 81.2 to 100% in the four groups. Counted from 40 hours after implant removal, estrus length (mean ± SEM) ranged from 8 ± 1 to 18 ± 1.4 hours. Rate of pregnancy of heifers serviced varied between 37.5 and 71.4%.
Conclusion. Estrus can be synchronized up to an average of 90% in Brahman heifers treated with Norgestomet + estradiol valerate, with variable length and intensity and a resulting pregnancy rate with natural service comparable to that obtained in Bos taurus females treated similarly.

REFERENCES

1. Porras AA, Galina H. Utilización de progestágenos para la manipulación del ciclo estral bovino. Vet Méx 1992; 23: 31-6.

2. González-Padilla E, Ruiz RL, Feber D, Denham A, Wiltbank JN. Puberty in beef heifers III Induction of fertile estrus. J Anim Sci 1975; 40:1110-8.

3. Rodríguez ROL, González PE. Sincronización de 2 estros consecutivos e inseminación artificial sin detección del estro en vacas y vaquillas. Téc Pec Méx 1983; 44:52-7.

4. Koppel RET, Rodríguez ROL. Sincronización del celo con progestágenos e I.A. en vaquillas Cebú en el trópico. México Ganadero.1992; 359: 17-23

5. Gobierno del Estado de Yucatán. Monografía. Secretaría de Planeación. Mérida, Yucatán, México. 1983.

6. Ayala BA, Delgado LR, Honhold NY, Magaña MJ. A visual condition scoring scheme for Bos indicus and crossbred cattle. In: Dual Purpose Cattle Production Research”, Eds, Anderson S, Wadsworth J. IFS (International Foundation for Science) / FMVZ-UADY 1995, Proceedings of an international workshop, March 1992, Mérida, México 1995; p. 119-28.

7. Williams GL. Breeding capacity, behavior and fertility of bulls with Brahman genetic influence during synchronized breeding of beef females. Theriogenology 1988; 30: 35-44.

8. Farin PW, Chenoweth PJ, Mateos ER, Pexton JE. Beef bulls mated to estrus synchronized heifers: single-vs multisire breeding groups. Theriogenology 1982; 17:365-71.

9. Snedecor GW, Cochran WG. Métodos estadísticos. Ed. Continental México. 1971.

10. Schwartz D. Méthodes Statistiques á L’usage des médecins et des biologistes. Flammarion Medecine Sciences. Paris. 1981.

11. Wishart DF, Young IM. Artificial insemination of progestin (SC1009) treated cattle at predeterminated times. Vet Rec 1974; 95: 503-8.

12. Salas-Vega E. Comportamiento reproductivo de novillas Brahman en respuesta al tratamiento con progestágenos en condiciones tropicales. Tesis de Maestría. Mérida, Yucatán, México. Universidad Autónoma de Yucatán. 1995

13. Menéndez TM, Robles BC, González PE. Sincronización del estro en vacas Cebú con o sin suplemento de melaza + urea. Tec Pec Méx 1977; 33: 9-14

14. Corbet NJ, Miller RG, Bindon BM, Burrow HM, Occhio MJ, Entwistle KW, et al. Synchronization of estrus and fertility in Zebu beef heifers treated with three estrus synchronization protocols. Theriogenology 1999; 51: 647-59.

15. Spitzer JC, Burell WC, LeFever DG, Whitman RW, Wiltbank JN. Synchronization of estrus in beef cattle I. Utilization of Norgestomet implant and injection of Estradiol Valerate. Theriogenology 1978; 10: 181-00.

16. Galina CS, Orihuela A, Rubio I. Behavioural trends affecting oestrus detection in Zebu cattle. Anim Reprod Sci 1996; 42: 465-70.

17. Orihuela Trujillo JA. Conducta estral del ganado Cebú. Tesis de Maestría en Producción Animal, UNAM. 1982

18. Bolaños JM, Forsberg M, Kindahl H, Rodríguez-Martínez H. Biostimulatory effects of estrous cows and bulls on resumption of ovarian activity in postpartum anestrus Zebu (Bos indicus) cows in the humid tropics. Theriogenology 1998; 49: 629-38.

19. Pinheiro LO, Barros CM, Figueiredo RA, Do Valle ER, Encarnacao RO, Padovani CR. Estrous behavior and the estrus to ovulation interval in Nelore cattle (Bos indicus) with natural estrus induced with Prostaglandin F2alpha or Norgestomet and estradiol valerate. Theriogenology 1998; 49:667-81.

20. Peter AR, Ball PJM. Reproducción del ganado vacuno. Zaragoza: Acribia; 1991.

21. Silva-Mena C, Aké-López R, Delgado-León R. Sexual behavior and pregnancy rate of Bos indicus bulls. Theriogenology 2000; 53:991-1002.

22. Boyd GW, Lunstra DD, Corah LR. Serving capacity of crossbred yearling beef bulls. I single-sire mating behavior and fertility during average and heavy mating loads at pasture. J Anim Sci 1989; 67: 60-71.

23. Blockey Ma DeB. Serving capacity a measure of the serving efficiency of bulls during pasture mating. Theriogenology 1976; 6: 393-401.

24. Boyd GW, Healy VM, Mortimer RG, Piotrowski JR. Serving capacity tests are unable to predict the fertility of yearling bulls. Theriogenology 1991; 36: 1015-26.

25. Farin PW, Chenoweth PJ, Tomky DF, Pexton JE. Breeding soundness, libido and performance of beef bulls mated to estrus synchronized females. Theriogenology 1989; 32: 717-25.