Open Access Open Access  Restricted Access Subscription Access
Cover Image

Different estrous induction protocols during non-breeding season in Assaf ewes

Hatem Atalla, Baher Abu Gazal

Abstract


This experiment was conducted to investigate the effect of pregnant mare serum gonadotrophin (PMSG) levels and the progestagen method on estrus response, onset and duration of estrus, lambing rate and litter size. A total of 20 Assaf ewes were used in the experiment, which was conducted during April, a month that is considered as non-breeding period in Palestine. Ewes were treated with intravaginal sponges containing 60 mg medroxyprogesterone acetate (MAP). Seven days later, sponges were removed and 10 new sponges were inserted to 10 of the experimental ewes. Following withdrawal of sponges at day 14, 5 ewes from each treatment groups were injected intramuscularly with a pregnant mare serum gonadotrophin (PMSG) at level of 300 or 600 IU. The results showed that level of PMSG and progesterone application methods had no significant effects on the tested parameters. This finding indicated that low level of PMSG can be applied for estrus synchronization. Results showed that using one sponge followed by a 300 IU dose of PMSG could induce estrus successfully with low cost comparing to application of two sponges and high doses of PMSG.

References


Ahmed Amer, H., Maher Hazzaa, A., 2009. The effect of different progesterone protocols on the reproductive efficiency of ewes during the non-breeding season. Veterinarski Arhiv, 79(1), 19-30.

Ahmed Muna, M.M., Makawib, S.E., Jubarac, A.S., 1998. Synchronization of oestrus in Nubian goats. Small Rumin. Res., 30(2), 113-120.

Akoz, M., Bulbul, B., Bozkurt, A.M., Dere, S., 2006. Induction of multiple births in Akkaraman cross-bred sheep synchronized with short duration and different doses of progesterone treatment combined with PMSG outside the breeding season. Bull. Vet. Inst. Pulawy, 50(1), 97.

Ataman, M., Akoz, M., Akman, O., 2006. Induction of synchronized oestrus in Akkaraman cross-bred ewes during breeding and anestrus seasons: The use of short-term and long-term progesterone treatments. Rev. Méd. Vét., 157(5), 257.

Ataman, M.B., Aköz, M., 2006. GnRH-PGF2α and PGF2α-PGF2α synchronization in Akkaraman cross-bred sheep in the breeding season. Bull. Vet. Inst. Pulawy, 50, 101-104.

Boscos, C., Samartzi, F., Dellis, S., Rogge, A., Stefanakis, A., Krambovitis, E., 2002. Use of progestagen-gonadotrophin treatments in estrus synchronization of sheep. Theriogenol., 58(7), 1261-1272.

Carlson, C.D., 2000. The effect of melatonin dosage and progesterone on reproduction in anestrous ewes. California State University Chico, College of Agriculture.

Chanvallon, A., Blache, D., Chadwick, A., Esmaili, T., Hawken, P., Martin, G., Viñoles, C., Fabre-Nys, C., 2010. Sexual experience and temperament affect the response of Merino ewes to the ram effect during the anoestrous season. Anim. Reprod. Sci., 119(3-4), 205-211.

de la Cruz, D., Castañeda, M., Rocha, C., 1990. Effects of oestrus synchronization by means of FGA-impregnated sponges on the fertility and prolificacy of partly housed pelibuey ewes. Memoria-III Congreso Nacional de Producción Ovina, Universidad Autónoma de Tlaxcala.

Dogan, I., Nur, Z., 2006. Different estrous induction methods during the non-breeding season in Kivircik ewes. Vet. Med. Praha, 51(4), 133.

Evans, G., 1986. Salamon’s artificial insemination of sheep and goats. Butterworths, Sydney, 194p.

Fonseca, J., Bruschi, J., Santos, I., Viana, J., Magalhaes, A., 2005. Induction of estrus in non-lactating dairy goats with different estrous synchrony protocols. Anim. Reprod. Sci., 85(1-2), 117-124.

Fukui, Y., Ishikawa, D., Ishida, N., Okada, M., Itagaki, R., Ogiso, T., 1999. Comparison of fertility of estrous synchronized ewes with four different intravaginal devices during the breeding season. J. Reprod. Dev., 45(5), 337-343.

Goot, H., 1986. Development of Assaf, a synthetic breed of dairy sheep in Israel. Proceedings (Hungary).

Gordon, I., 1996. Controlled reproduction in sheep and goats. CAB International, University Press, Cambridge, UK.

Greyling, J., Van der Nest, M., 2000. Synchronization of oestrus in goats: dose effect of progestagen. Small Rumin. Res., 36(2), 201-207.

Hashemi, M., Safdarian, M., Kafi, M., 2006. Estrous response to synchronization of estrus using different progesterone treatments outside the natural breeding season in ewes. Small Rumin. Res., 65(3), 279-283.

Husein, M.Q., Kridli, R.T., 2002. Reproductive responses of Awassi ewes treated with either naturally occurring progesterone or synthetic progestagen. Asian Australas. J. Anim. Sci., 15(9), 1257-1262.

Karaca, F., Ataman, M., Coyan, K., 2009. Synchronization of estrus with short-and long-term progestagen treatments and the use of GnRH prior to short-term progestagen treatment in ewes. Small Rumin. Res., 81(2), 185-188.

Knights, M., Baptiste, Q., Dixon, A., Pate, J., Marsh, D., Inskeep, E., Lewis, P., 2003. Effects of dosage of FSH, vehicle and time of treatment on ovulation rate and prolificacy in ewes during the anestrous season. Small Rumin. Res., 50(1), 1-9.

O’callaghan, D., Karsch, F., Boland, M., Roche, J., 1991. What photoperiodic signal is provided by a continuous-release melatonin implant? Biol. Reprod., 45(6), 927-933.

PCBS, 2008. Palestine in Figures 2007 (PNA, P.C.B.S., Ramallah, Palestine).

Pollott, G., Gootwine, E., 2004. Reproductive performance and milk production of Assaf sheep in an intensive management system. J. Dairy Sci., 87(11), 3690-3703.

Rad, A.F., Farzaneh, N., 2007. Effect of CIDR and different doses of PMSG on pregnancy and lambing rate out of breeding season in Balouchi ewes. J. Anim. Vet. Adv., 6(10), 1167-1171.

Romano, J., Abella, D.F., Villegas, N., 2001. A note on the effect of continuous ram presence on estrus onset, estrus duration and ovulation time in estrus synchronized ewes. Appl. Anim. Behav. Sci., 73(3), 193-198.

Rosa, H., Bryant, M., 2002. The ‘ram effect’ as a way of modifying the reproductive activity in the ewe. Small Rumin. Res., 45(1), 1-16.

Simonetti, L., Blanco, M., Gardón, J.C., 2000. Estrus synchronization in ewes treated with sponges impregnated with different doses of medroxyprogesterone acetate. Small Rumin. Res., 38(3), 243-247.

Sözbilir, N.B., Maraşli, Ş., Öztürkler, Y., Uçar, Ö., 2006. Effects of double injections of PGF_{2}alpha at different intervals on some reproductive traits in Tuj ewes. Turk. J. Vet. Anim. Sci., 30(2), 207-211.

SPSS Inc, 2008. SPSS 16 for windows. Statistical package for the social sciences. Chicago, U.

Stellflug, J., Fitzgerald, J., Parker, C., Bolt, D., 1988. Influence of concentration, duration and route of administration of melatonin on reproductive performance of spring-mated Polypay and Polypay-cross ewes. J. Anim. Sci., 66(8), 1855-1863.

Timurkan, H., Yildiz, H., 2005. Synchronization of oestrus in Hamdani ewes: the use of different PMSG doses. Bull. Vet. Inst. Pulawy, 49(3), 311.

Toteda, F., Facciolongo, A., Manchisi, A., Martemucci, G., 1990. Effect of PMSG dose and presence of the male on control of the oestrus in cyclic ewes. Zoo. Nutr. Anim., 16(4), 263-270.


Full Text: PDF

Refbacks

  • There are currently no refbacks.