Asian Journal of Animal and Veterinary Advances1683-99191996-3289Academic Journals Inc.10.3923/ajava.2011.1010.1018KalabaZ.M. Abdel-KhalekA.E. 102011610Various hormonal treatments were used for induction of ovulation to increase fertility of rabbits. Aim of the present study was to investigate the effect of repeated GnRH injections or Intra-Vaginal Mechanical Stimulation (IVMS) at mating for six consecutive litters, on fertility of naturally mated New Zealand White rabbit does. Does failed to kid after one service were mated in the next parity. Kindling Rate (KR), Number of Total (NTB) and Live Borns (NLB), Viability Rate (VR) and average Kit Weight (AKW) at birth as well as Gestation Period Length (GPL) were recorded after kidding for six consecutive parities. Also, concentrations of Follicle Stimulating Hormone (FSH) and Luteinzing Hormone (LH) were determined after mating of the 2nd litter. Results reveled that GnRH treatment showed highest (p<0.05) KR (71.4%), NTB (6.16/litter), NLB (5.53/litter) and VR (89.8%) and shortest (p<0.05) GPL (30.93 d). However, IVMS showed highest (p<0.05) AKW (66.59 g). Highest (p<0.05) VR was at the 1st and 2nd parity (87.5 and 84.5%), lowest at the 3rd parity (73.8%) and modest between 4th-6th parity. At 2, 3 and 4 h post-mating, FSH concentration was 12.04, 12.90 and 9.58 ng mL-1, while LH concentration was 16.0, 10.38 and 9.63 ng mL-1, respectively. The current study indicated that repeated injection with 0.2 mL GnRH analogue/doe (Receptal) at mating for 6 consecutive litters resulted in the best reproductive performance of rabbit does, leading to improving fertility of NZW does.]]>Argente, M.J., M.A. Santacreu, A. Climent, G. Bolet and A. Blasco,19977523502354Arimura, A., H. Sato, T. Kumasaka, R.B. Worobec, L. Debeljuk, J. Dunn and A.V. Schally,19739310921103Bonanno, A., F. Mazza, A. Di Grigoli and M.L. Alicata,20082008pp: 397310Calder, M.D., A.N. Caveney, M.E. Westhusin and A.J. Watson,2001in vitro.]]>65135140Dekel, N., O. Lewysohn, D. Ayalon and E. Hazum,198812312051207Garza, F. Jr., D.L. Thompson Jr., D.D. French, J.J. Wiest and R.L. St. George et al.,198635347352Greenwood, F.C., W.M. Hunter and J.S. Glover,1963131I-labelled human growth hormone of high specific radioactivity.]]>89114123Koves, K., P.E. Gottschall and A. Arimura,198941505511Laborda, P., M.A. Garcia, E. Moce and M.L. Moce,20082008pp: 375379Mills, T.M. and R.J. Gerardot,19843012431252Moce, E., R. Lavara and J.S. Vicente,200375107118Muelas, R., P. Cano, M.L. Garcia, A. Esquifino and M.J. Argente,20082008pp: 13071311Ondruska, L., V. Parkanyi, J. Rafay and I. Chlebec,20082008pp: 423425Quintela, L.A, A.I. Pena, M.D. Vega, J. Gullon and M.C. Prieto et al.,2004447888Rebollar, P.G., J.M. Alvarino, J.C. Illera and G. Silvan,199753205210Rebollar, P.G., A. Milanes, N. Pereda, P. Millan and P. Cano et al.,200693218230Rodriguez, J.M., C. Agrasal and A. Esquifino,1989205765Rommers, J.M., R. Meijerhof, J.P. Noordhuizen and B. Kemp,200481151158SAS.,2004Santacreu, M.A., P. Gou and A. Blasco,199255271276Taponen, J., P. Hjerppe, M.E. Kopra, H. Rodriguez, T. Katila and H. Kindahl,20032α secretion causes luteal regression in GnRH-induced short estrous cycles in cyclic dairy heifers.]]>60379393Theau-Clement, M., G. Bolet, L. Fortun-Lamothe, G. Brecchia and C. Boiti,20082008pp: 459463Ubilla, E., J.M.R. Alvarino, A. Esquifino and C. Agrasal,1992271320Ubilla, E., P.G. Rebollar, D. Pazo, A.I. Esquifino and J.M. Alvarino,2000676774Ubilla, E., P.G. Rebollar, D. Pazo, A. Esquifino and J.M.R. Alvarino,2000118361366Viudes-de-Castro, M.P., R. Lavara, F. Marco-Jimenez, C. Cortell and J.S. Vicente,20076810311336Wong, W.Y. and J.S. Richards,199213035123521Yang, B.C., T. Uemura and H. Minaguchi,199512728732Yoshimura, Y., Y. Nakamura M. Ando, M. Jinno, T. Nanno and T. Oda,199247118125Zanagnolo, V., A.M. Dharmarajan, J. Hesla and E.E. Wallach,199613754005406Zapletal, D. and A. Pavlik,2008104306315Zapletal, D., V. Adamec and D. Klecker,1990Oryctolagus cuniculus) during year.]]>51123132Duncan, D.B.,195511142