Effects of injection of PGF2α and eCG after CIDR removal on Reproductive Performance in Atabay ewes non-breeding season

Document Type : Physiology (Animal)

Authors

Department of Animal Science, Faculty of Agriculture, Varamin- Pishva Branch, Islamic Azad University, Varamin, Iran

Abstract

Fourthy eaight Atabay ewes were randomly allocated as CRD in 4 treatment groups. Treatments were as (1) pretreatment with CIDR for 12 days and then receiving PGF at the time of withdrawal of the CIDR (2) pretreatment with CIDR for 12 days and then receiving eCG (3) pretreatment with CIDR for 7 days and then receiving PGF and (4) pretreatment with CIDR for 7 days and then receiving eCG. No significant differences were observed in term of male to female lambs ratio, lamb birth weight and weight after weaning (p>0.05). percentage of estrus were 100, 75, 58.33 and 50 respectively. The highest percentage of estrus were observed in treatment 1 with a significant difference with others (p<0.05). parturition rate was 88.33, 88.88, 100 and 100 percentages respectively and this term in treatment 3 and 4 were higher than treatment 1 significantly (p<0.05). lambing rate were 130, 100, 128 and 120 percentages respectively. Twining rate were 30, 0.0, 28 and 20 percentages respectively. The lowest Lambing and twining rates refer to treatment 2 with a significant differ with other treatments (p<0.05). In conclusion, long time CIDR (12 days) and injection of PGF had better results in comparison to eCG hormone and pretreatment with CIDR for 7 days had no significant difference between PGF2α or eCG injection. Also injection of eCG after CIDR removal (7 days) compare to (12 days) caused an increase in efficiency of parturition rate, lambing rate and twining rate in Atabay ewes.

Keywords


  1. Ali, A., 2007. Effect of time of eCG administration on follicular response and reproductive performance of FGA treated Ossimi ewes. Small Ruminant Research. Vol. 72, pp: 33-37.
  2. Barrett, D.; Bartlewski, P.; Batista-Arteaga, M.; Symington, A.  and Rawlings, N., 2004. Ultrasound and endocrine evaluation of the ovarian response to a single dose of 500 IU of eCG following a 12-day treatment with progestogen-releasing intravaginal sponges in the breeding and nonbreeding seasons in ewes. Theriogenology. Vol. 61, pp: 311-327.
  3. Carlson, K.M.; Pohl, H.A.; Maracek, J.M.; Muser, R.K. and Wheaton, J.E., 1989. Evaluation of progesterone controlled internal drug release dispenser for synchronozation of estrus in sheep. Animal Reproduction Science. Vol. 18, pp: 205-218.
  4. Cline, M.A.; Ralston, J.N.; Seals, R.C. and Lewis, G.S., 2001. Intervals from norgestoment withdraval and injection of equine chorionic gonadotropin or PG600 to estrus and ovulation in ewes. Journal of Animal Science. Vol. 79, pp: 589-594.
  5. Husein, M.  and Ababneh, M., 2008. A new strategy for superior reproductive performance of ewes bred out-of season utilizing progestagen supplement prior to withdrawal of intravaginal pessaries. Theriogenology. Vol. 69,
    pp: 376-383.
  6. Husein, M.; Bailey, M.; Ababneh, M.; Romano, J.; Crabo, B. and Wheaton, J., 1998. Effect of eCG on the pregnancy rate of ewes transcervically inseminated with frozen-thawed semen outside the breeding season. Theriogenology. Vol. 49, pp:  997- 1005.
  7. Inskeep, K.; Knights, M. and Ramboldt, T., 2010. Out of season breeding using the EAZI-BREED CIDR-G in ewes. https://www.apsc.vt.edu/extension/sheep/programs/11proceedings CIDR.pdf.
  8. Kermani Moakhar, H.; Kohram, H.; Zareh Shahneh, A.  and Saberifar, T., 2011. Ovarian response and pregnancy rate following different doses of eCG treatment in Chall ewes.  Small Ruminant Research. Vol. 102, pp: 63-67.
  9. Luther, J.S.; Grazul–Bilshka, A.T.; Reynolds, L.P.; Navanukraw, C.; Choi, J.T.; Pant, D.; Kirsch, J.D.; kraft, K.C.; Weigl, R.; Limesand, W. and Redmer, D.A., 2002. Effects pregnant mare serum gonadotropin on the incidence of estrus and pregnancy rates in ewe's artificial insemination during the breeding season. North Dakota State University, Fargo, ND, USA.
  10. Menchaca, A.  and Rubianes, E., 2004. New treatments associated with timed artificial insemination in small ruminants. Reproduction, Fertility and Development. Vol. 16, pp: 403-413.
  11. Menzer, C.  and Schams, D., 1979. Radioimmunoassay for PMSG and its application to in-vivo studies. Journal of Reproduction and Fertility. Vol. 55, pp: 339-345.
  12. Moghaddam, G.H.; Olfati, A.; Daghigh Kia, H.  and Rafat, S.A., 2012. Study of reproductive performance of crossbred ewes treated with GnRH and PMSG during breeding season. Iranian Journal of Applied Animal Science. Vol. 2, No. 4, pp: 351-356.
  13. Pintado, B.; Gutierrez-Adan A. and Llano, B.P., 1998. Superovulatory response of Murciana goats to treatments based on PMSG/anti-PMSG or combined FSH/PMSG administration. Theriogenology. Vol. 50, pp: 357-364.
  14. Quintero-Elisea, J.A.; Macías-Cruz, U.; Álvarez Valenzuela, F.D.; Correa-Calderón, A.; González-Reyna, A.; Lucero-Magaña, F.A.; Soto-Navarro, Se.A. and Avendaño-Reyes, L., 2011. The effects of time and dose of pregnant mare serum gonadotropin (PMSG) on reproductive efficiency in hair sheep ewes. Tropical Animal Health and Production. Vol. 43, pp: 1567-1573.
  15. Ramsey, W.S. and Satterfield, M.C., 2003. The effect of induced ovulation on pregnancy rate in lapaeascopically artificial insemination (LAI) ewe using frozen semen. Texas University System, Animal Science Department, College Station.
  16. Wheaton, J.E.; Carlson, K.M.; Windels, H.F. and Johnstin, L.J., 1992. CIDR: A new progesterone-releasing intravaginal device for induction of estrus and cycle control in sheep and goast. Small Ruminnant Research. Vol. 16, pp: 27-36.
  17. Wildeus, S., 2000. Current concepts in cynchronization of estrous: sheep and goats. Journal of Animal Science. Vol. 77, pp: 1-14.
  18. Zeleke, M.; Greyling, J.; Schwalbach, L.; Muller, T. and Erasmus, J., 2005. Effect of progestagen and PMSG on oestrous synchronization and fertility in Dorper ewes during the transition period.  Small Ruminant Research. Vol. 56, pp: 47-53.