Hernández CJ, Porras AA, Salgado AA, Lima TV

Language: English/Spanish
References: 19
Page: 19-22
PDF size: 433.30 Kb.

ABSTRACT

The objective of this study was to evaluate the response to a treatment with prostaglandin F2α. (PGF2α) for the induction of estrus in Holstein heifers. Rectal palpation was carried out every week on heifers that were at least 13 months old. Those heifers having a palpable corpus luteum were treated with natural PGF2α (Dinoprost-Thrometamine). The experiment was repeated until 1290 heifers had been treated. All heifers were continuously observed for estrus detection after the treatment. The time of onset of estrus was registered: 95.2% (1228/1290) of the treated heifers showed estrus within 144 h after the injection of PGF2α. The average interval from the injection to the onset of estrus was 69.9 ± 0.15 h, with a 95% confidence interval that ranged from 69.6 to 70.2 h. Artificial insemination was done 11.8 ± 0.11 h after the onset of estrus, and a 65.2% conception resulted. There were no differences in the conception rates of heifers that had different intervals from treatment to estrus. It is concluded that PGF2α is effective for the induction of estrus in heifers, and that there is no relation between the duration of the interval from treatment to estrus and the fertility of the induced estrus.

REFERENCES

1. Fogwell, R.L., Reid, W.A., Thompson, C.K., Thome, M.J. and Morrow, D.A.: Synchronization of estrus in dairy heifers: A field demonstration. J Dairy Sci., 69: 1665-1672 (1986).

2. Foote, R.H.: Times of artificial insemination and fertility in dairy cattle. J. Dairy Sci., 62: 355-358 (1978).

3. Fortune, J.E., Sirois, J., Turzillo, A.M. and Lavoir, M.: Follicle selection in domestic ruminants. J. Reprod. Fert., 43: 187-198 (1991).

4. Graves, R.L., Lutz, R.G., Riesen, J.W., Hoagland, T.A. and Woody, C.O.: Factors influencing estrus and conception in dairy heifers after prostaglandin F 2-alpha. Theriogenology, 23: 733-742 (1985).

5. Gwazdauskas, F.C., Whittier, W.D., Vinson, W.E. and Pearson, R.E.: Evaluation of reproductive efficiency of dairy cattle with emphasis on timing of breeding. J. Dairy Sci., 69: 290-297 (1986).

6. Hunter, R.H.F.: Fertility in cattle: Basic reasons why late insemination must be avoided. Anim. Breed. Abstr., 53: 83-87 (1985).

7. Kaim, M., Rosenberg, M. and Folman, Y.: Management of reproduction in dairy heifers based on synchronization of estrous cycles. Theriogenology, 34: 537-547 (1990).

8. King, M.E., Kiracofe, G.H., Stevenson, J.S. and Schalles, R.R.: Effect of stage of the estrus cycle on interval to estrus after PGF2α in beef cattle. Theriogenology, 18: 191-201 (1982).

9. Macmillan, K.L. and Henderson, H.V.: Analyses of variation in the interval from an injection of prostaglandin F2α to oestrus as a method of studying patterns of follicle development during dioestrus in dairy cows. Anim. Reprod. Sci., 6: 245-254 (1983-1984).

10. Momont, H.W. and Seguin, B.E.: Interval to estrus after prostaglandin treatment of dairy heifers is independent of rate of luteolysis. Proceedings of the 10th International Congress of Animal Reproduction and Artificial Insemination. Champaign, Urbana, U.S.A. 1984. 448. Animal Reproduction and Artificial Insemination. Champaign, Urbana, U.S.A. (1984).

11. Ortiz, G.O., Zarco, Q.L. y Suárez, L.: Determinación de losfactores que afectan la respuesta de un programa de sincronización de estros con PGF2α. Memorias del XII Congreso Nacional de Buiatría. Tampico, Tamaulipas, México. 1986. 748-752. Asociación Nacional de Médicos Veterinarios Zootecnistas Especialistas en Bovinos. Tampico, Tamaulipas, México (1986).

12. Plunkett, S.S., Stevenson, J.S. and Call, E.P.: Prostaglandin F2α for lactating dairy cows with a palpable corpus luteum but unobserved estrus. J. Dairy Sci., 67: 380-387 (1984).

13. Rothschuh, V.J., Zarco, Q,L. y Sagardía, R.J.: Caracterización de los eventos periovulatorios en vaquillas Holstein del Centro de Recría de Tizayuca, Hgo. Memorias de la Reunión de Investigación Pecuaria en México 1987. México, D.F. 1987. 359-361. Instituto Nacional de Investigación Forestal Agrícola y Pecuaria. México, D.F. (1987).

14. Scaramuzzi, R.J., Turbull, K.E. and Nancarrow, C.D.: Growth of Graafian follicles in cows following luteolysis induced by the prostaglandin F2α analogue, Cloprostenol. Aust. J. Biol. Sci., 33: 63-69 (1980).

15. Stevenson, J.S., Schmidt, M.K. and Call, E.P.: Stage of estrous cycle time of insemination and seasonal effects on estrus and fertility of Holstein heifers after prostaglandin F2α. J. Dairy Sci., 67: 1798-1805 (1984).

16. Tanabe, T.Y. and Hann, R.C.: Synchronized estrus and subsequent conception in dairy heifers treated with prostaglandin F2α. I. Influence of stage of cycle at treatment. J. Anim. Sci., 58:805-811 (1984).

17. Trimberger, G.W. and Davis, H.P.: Conception rate in dairy cattle by artificial insemination at various stages of estrus. Nebr. Agric. Exp. St. Res. Bull., 129: 1 (1943).

18. Watts, T.L. and Fuquay, J.M.: Response and fertility of dairy heifers following injection with prostaglandin F2α during early middle or late diestrus. Theriogenology, 23: 665-671 (1985).

19. Zarco, Q.L.: Factores que afectan los resultados de la inseminación artificial en el bovino lechero. Vet. Méx., 21: 235-240 (1990).