References

Abd El-Azim, A.M., 1996. Aging and its effect on the reproductive perfomance of male one humped camel during different seasons. Ph.D. Thesis, Fac. Vet. Med., Zagazig University, Zagazig, Egypt.

Agarwal, S.P., V.K. Agarwal, N.D. Khanna and P.K. Dwarknath, 1987. Profiles of steroid hormones in male camel. Indian J. Anim. Sci., 57: 659-964.

Ahima, R.S., C.B. Saper, J.S. Flier and J.K. Elmquist, 2000. Leptin regulation of neuroendocrine systems. Front. Neuroendocrinol., 21: 263-307.
CrossRef  |  PubMed  |  

Al-Qarawi, A.A., H.A. Abdel-Rahman, M.S. El-Belely and S.A. El-Mougy, 2000. Age-related changes in plasma testosterone concentrations and genital organs content of bulk and trace elements in the male dromedary camel. Anim. Reprod. Sci., 62: 297-307.
CrossRef  |  

Al-Saiady, M.Y., H.H. Mogawer, S.E. Al-Mutairi, M. Bengoumi, B. Faye, A. Musaad and A. Gar-Elnaby, 2012. Effect of different feeding regime on body weight, ovaries size fevelopments and blood estradiol, progesterone level in pre-pubertal she-camel (Camelus dromedarius). J. Anim. Vet. Adv., 11: 3522-3526.
Direct Link  |  

Carro, E., L. Pinilla, L.M. Seoane, R.V. Considine and E. Aguilar et al., 1997. Influence of endogenous leptin tone on the estrous cycle and luteinizing hormone pulsatility in female rats. Neuroendocrinology, 67: 375-377.
CrossRef  |  

Chilliard, Y., M. Bengoumi, C. Delavaud, Y. Faulconnier and B. Faye, 2005. Body Lipids and Adaptation of Camel to Food and Water Shortage: New Data on Adipocyte Size and Plasma Leptin. In: Desrtfication Combat and Food Safety, Faye, B. and P. Esenov (Eds.). Vol. 362. IOS Press, Amsterdam, Netherlands, pp: 135-145.

Delavaud, C., M. Bengoumi, B. Faye, D. Levieux and Y. Chilliard, 2013. Plasma leptin, glucose and non-esterified fatty acid variations in dromedary camels exposed to prolonged periods of underfeeding or dehydration. Comp. Biochem. Physiol. Part A: Mol. Integr. Physiol., 166: 177-185.
CrossRef  |  

El-Hariary, M.A., A.E.B. Zeidan, A.A. Afify, H.A. Amer and A.M. Amer, 2010. Ovarian activity, biochemical changes and histological status of the dromedary she-camel as affected by different seasons of the year. Nat. Sci., Vol. 8

Homeida, A.M., M.G.R. Khalil and A.A.M. Taha, 1988. Plasma concentrations of progesterone, oestrogens, testosterone and LH-like activity during the oestrous cycle of the camel (Camelus dromedarius). J. Reprod. Fertil., 83: 593-598.
CrossRef  |  PubMed  |  Direct Link  |  

Kaufmann, B.A., 2005. Reproductive performance of camels (Camelus dromedaries) under pastoral management and its influence on herd development. Livestock Prod. Sci., 92: 17-29.
CrossRef  |  

Khanna, N.D., S.N. Tandon and A.K. Rai, 1990. Breeding parameters of Indian camels. Indian J. Anim. Sci., 60: 1347-1354.
Direct Link  |  

MOA, 2006. Animal population numbers. Ministry of Agriculture, Kingdom of Saudi Arabia.

Marai, I.F.M., A.E.B. Zeidan, A.M. Abdel-Samee, A. Abizaid and A. Fadiel, 2009. Camels reproductive and physiological performance traits as affected by environmental conditions. Trop. Subtrop. Agroecosyst., 10: 129-149.
Direct Link  |  

Matharu, B.S., 1966. Management production and reproduction in dromedary. Indian Farm., 16: 19-22.

Mohamed, M.I., 2006. Growth performance of growing Maghraby camel fed non conventional feed. Proceedings of the International Science Conference on Camels, May 9-11, 2006, Al-Qassim, KSA., pp: 234-.

Musa, B.E., H. Siema, H. Merkt, B. Hago, M. Cooper, W. Allen and W. Jochle, 1993. Manipulation of reproductive functions in male and female camels. Anim. Reprod. Sci., 33: 289-306.
CrossRef  |  

Musa, H.H., E.S. Shuiep, E.M. El-Zubier Ibtissam and C.H. Chen, 2006. Some reproductive and productive tracts of camel (Camelus dromedarius) in western Sudan. J. Anim. Vet. Adv., 5: 590-592.

SAS, 2012. SAS system for windows, version 9.3. SAS Institute Inc., Cary, NC., USA.

Shujait, A., A. Nazir, A. Nafees, Zia-ur-Rahman and M. Sarwar, 2007. Effect of season and age on the ovarian size and activity of one-humped camel (Camelus dromedaries). Asian-Aust. J. Anim. Sci., 20: 1361-1366.
Direct Link  |  

Shwartz, H.J., 1992. Productive performance and productivity of dromedaries (Camelus dromedarius). Anim. Res. Dev., 35: 86-98.

Skidmore, J.A., W.R. Allen and R.B. Heap, 1994. Oestrogen synthesis by the peri-implantation conceptus of the one-humped camel (Camelus dromedarius). J. Reprod. Fert., 101: 363-367.
PubMed  |  

Smith, G.D., L.M. Jackson and D.L. Foster, 2002. Leptin regulation of reproductive function and fertility. Theriogenology, 57: 73-86.
CrossRef  |  Direct Link  |  

Sumar, J.B., 2000. Llamas and Alpacas. In: Text Book on Reproduction in Farm Animals, Hafez, B. and E.S.E. Hafez (Eds.). 7th Edn., Lippincott Williams and Wilkins, Philadelphia.

Tartaglia, L.A., M. Dembski, X. Weng, N. Deng and J. Culpepper et al., 1995. Identification and expression cloning of a leptin receptor, OB-R. Cell, 83: 1263-1271.
CrossRef  |  PubMed  |  Direct Link  |  

Tibary, A. and A. Anouassi, 1997. Theriogenology in Camelidae. 1st Edn., Ministry of Agriculture and Information, United Arab Emirates.

Wade, G.N., J.E. Schneider and H.Y. Li, 1996. Control of fertility by metabolic cues. Am. J. Physiol., 270: E1-E19.
Direct Link  |  

Williamson, G. and W.J.A. Payne, 1978. An Introduction to Animal Husbandry in the Tropics. 3rd Edn., Longman Group (Far East), Ltd., London, ISBN: 9780582468139, Pages: 755.

Wilson, R.T., 1989. Reproductive performance in the dromedary camel. Base empirique. Revue Elev. Med. Vet. Pays. Trop., 42: 117-125.

Yu, W.H., A. Walczewska, S. Karanth and S.M. McCann, 1997. Nitric oxide mediates leptin-induced luteinizing hormone-releasing hormone (LHRH) and LHRH and leptin-induced LH release from the pituitary gland. Endocrinology, 138: 5055-5058.
Direct Link  |  

Yu, W.H., M. Kimura, A. Walczewska, S. Karanth and S.M. McCann, 1997. Role of leptin in hypothalamic-pituitary function. Proc. Natl. Acad. Sci. USA., 94: 1023-1028.
Direct Link  |  

Zeidan, A.E.B., M.A. El-Harairy, S.A. Gabr, M.A. Tag El-Dien, S.A. Abd El-Rahman and A.M. Amer, 2011. In vitro maturation of camel oocytes as affected by different media duringbreeding and non-breeding seasons. J. Am. Sci., 7: 460-472.
Direct Link  |  

Zhang, Y., R. Proenca, M. Maffei, M. Barone, L. Leopold and J.M. Friedman, 1994. Positional cloning of the mouse Obese gene and its human homologue. Nature, 372: 425-432.
CrossRef  |  Direct Link  |