Ortega-Pacheco A, Torres-Acosta JFT, Aguilar-Caballero AJ, Ramón-Ugalde JP

Language: Spanish
References: 18
Page: 179-184
PDF size: 28.09 Kb.

ABSTRACT

Introduction. Reproductive performance of goats in the tropics shows high fertility rates. High temperature and forage availability can affect this behavior. Estrus synchronization by progestagens is used to control sexual activity but reproductive efficiency can be negatively affected.
The objective of this study was to determine fertility and reproductive failures in a flock of criollo goats after estrus synchronization using intravaginal progestagens, equine chorionic gonadotrophin (eCG) and natural mating.
Material and methods. Estrus of 33 criollo goats was synchronized using 40-mg flurogestone -acetate vaginal sponges and eCG; natural service was allowed. Ovulation rate was determined by counting through laparoscopy, the number of corpus luteum. Pregnancy rate was determined by ultrasonography at 45 days postservice (PS). Reproductive efficiency and percentage of reproductive failure was determined after kidding occurred.
Results. From the goats, 94.11% showed estrus; 43.20% were pregnant at 45 days PS; 33.335% kidded and had a prolificy of 2.4 kids. Ovulation rate was 2.97; the ovulation rate for kidded and non kidded does was 3.62 and 2.50 respectively. One doe did not showed estrus (2.94%) and ovulation (2.94%). Fertilization failure and embryonic death from kidded does was 52.94% and 76.24% including ovulations from non kidded does. Three abortions were detected (9.1%).
Discussion. The therapy used was effective to induce and synchronized estrus. Pregnancy rate and fertility was very low probably because of the high incidence of embryonic death and abortions occurred. Prolificy was a consequence of high ovulation rate. Ambiental temperature and embryo competition were probably the cause of embryonic death.

REFERENCES

1. Jaramillo LE. Comportamiento productivo de cabras en el trópico seco de México. Memorias de la X Reunión Nacional sobre Caprinocultura; FMVZ-UAZ, AMPCA. Zacatecas Zac; 1995. p. 11-7.

2. Wilkins JF, Crocker KP. Embryonic wastage in ewes En: Oldan CM, Martin MB, Porvis LW, editores. Reproductive Physiology of Merino Sheep, Concepts and Consequences. Perth: University of Western Australia; 1990. p. 169-7.

3. Thatcher WW, Staples CR, Danet-Desnogers G, Oldick B, Schmitt EP. Embryo health and mortality in sheep and cattle. J Anim Sci 1994; 72 (Suppl 3):16-30.

4. Baril G, Remy B, Leboeuf B, Beckers JF, Saumande, J. Synchronization of estrus in goats: the relationships between eCG binding in plasma, time of occurrence of estrus and fertility following artificial insemination. Theriogen 1996; 45:1553-9.

5. Freitas VJF, Baril G, Saumande J. Induction and synchronization of estrus in goats: the relative efficiency of one versus two fluorogestone acetate-impregnated vaginal sponges. Theriogen 1996; 46:1251-6.

6. Rueda MDF, Trejo GA, Salinas AR. Efecto de dosis de poligestona usadas como preparadores sobre la tasa ovulatoria y la prolificidad en cabras criollas desafiadas con PMSG para la ovulación múltiple durante el anestro. Memorias de la XII Reunión Nacional sobre Caprinocultura. UAAAN, Torreón Coahuila, Mex.; 1997. p. 103-8.

7. Coteel JM. The use of progestagens to control oestrus cycle of the dairy goat. Ann Biol Anim Bioch Biophsys 1975; 15:353-63.

8. Baril G, Leboeuf B, Saumande J. Synchronization of estrus in goats: the relationships between time of occurrence of estrus and fertility following artificial insemination. Theriogen 1993; 40:621-8.

9. Kusina NT, Tarwirei F, Hamudikuwanda H, Agumba G, Mukwena JA. Comparation of the effects of progesterone sponges and ear implants, prostaglandins and their combination on efficacy of estrus synchronization and fertility of Mashona goat does. Theriogen 2000 53:1567-80.

10. Chávez GL, Zarco QL, Ducoing WA, Flores PG. Utilización de acetato de melengestrol y acetato de fluorogestona solos o combinados con gonadotropina sérica de yegua preñada para la sincronización de estros en cabras lecheras. AZTECA. Memorias del VII Congreso Nacional en Caprinocultura. Sinaloa, Mex.; 1990. p. 147-8.

11. Estrada BE, Gutiérrez AJ. Uso de Acetato de Fluorogestona, Norgestomet y Norgestometprostaglandinas en la sincronización de estros en cabras. Memorias de la XII Reunión Nacional sobre Caprinocultura, AMPCA, Torreón Coahuila; 1997. p. 191-5.

12. Cervantes J, Ducoing WA, Flores PG, Zarco Q. Utilización del acetato de melengetrol y acetato de fluorogestona para la inducción de la pubertad en cabras primalas y para la inducción de estros durante la estación de anestro en cabras adultas. AZTECA. Memorias del V Congreso Nacional sobre Caprinocultura; UNAM, Mex.; 1988. p. 36-6.

13. Torres-Acosta JF, Aguilar-Caballero A, Ortega- Pacheco A. Comportamiento reproductivo de cabras criollas en el trópico subhúmedo del estado de Yucatán, México. XII Reunión Nacional sobre Caprinocultura. UAAAN, Torreón Coahuila, Mex.; 1997. p. 83-6.

14. East NE, Rowe JD. Subcutaneous progestin implants vs. intavaginal sponges for dairy goats estrus synchronization during the transitional period. Theriogen 1989; 32: 921-8.

15. Hulet CV. Determining fetal numbers in pregnant ewes. J Anim Sci 1977; 36:325-30.

16. Bolet G. Timing and extent of embryonic mortality in pigs, sheep and goats; genetic variability. En: Sreenan JM, Diskin MG, editores. Embryonic Mortality in Farm Animals. Dordrecht: Martinus Nijhoff Publishers; 1986. p. 12-43.

17. White DH, Rizzoli DJ, Cumming AI. Embryo survival in relation to number and site of ovulation in ewe. Aust J Exp Agric Anim Husb 1981; 21:32-8.

18. Savio JD, Thatcher WW, Morris GR, Entwistle K, Drost M, Mattiacci MR. Effects of induction of low plasma progesterone concentration with a progesterone-releasing intravaginal device on follicular turnover and fertility in cattle. J Rep Fert 1993; 98:77-4.