Role of Leptin and Insulin like Growth Factor-I in Breeding Egyptian Horses along the Year

 

Amal M. Abo El-Maaty, Mohamed S. Kotp, Magda M. El-Tohamy, Walid S. EL Natat and Amira H. Mohamed
 

 

Research Paper I Published December,2015

 

Journal of Medical and Biological Science Research Vol. 1 (10), pp. 169-178

 

ABSTRACT

To confirm that mares are regular polyestrous animal all the year round, ovarian follicles, corpora lutae were detected with ultrasound and blood samples were collected with all ultrasonographic examination of 516 non pregnant mares. Blood samples were assayed for progesterone, leptin and Insulin like growth factor –I (IGF-1) using commercial ELISA kits. Progesterone levels > 2 ng/mL accompanied a corpus luteum on ovary all months of the year and progesterone levels <1ng/ml accompanied a large follicle >30 mm in diameter in addition to estrous behavior indicated regulatory of estrus. As well as, commencement of foaling from December to May (Winter and Spring) each year indicate that horses are not a long day breeder and that horse breeders prefer Winter and Spring to breed their mares due to the suitable environmental temperature and the availability of good quality green clover to feed their mares after expected foaling within the same seasons. Leptin levels decreased significantly during September while IGF-1 levels decreased significantly during June and July. In conclusion, mares of Egypt cycle all the year round but breeding them depends on their breeder decision. Leptin and IGF-1 have no role in breeding horses in Egypt.

Key words: Oestrus Cyclisity, Leptin, Progesterone, IGF-1 and Mare.

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