The Effect of Buserelin Treatment of Mated Awasi Ewes During the Summer on Plasma Progesterone Concentrations and Lambing Rate

(Ghazi bin Faisal Bassiouni and Abdkad)

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Abstract

The main objective of this study was to investigate the ability of buserelin, a GnRH-agonist, to maintain pregnancy in Awasi ewes mated during summer. Ewes were divided into two groups (28 ewes/group). In the first group, ewes were injected intramuscularly with 10 micrograms of buserelin 12 days after the start of mating. In the second group (control), ewes were injected with normal saline. Oestrus was synchronized in all ewes using intravaginal progestagen sponges. These sponges were removed after 12 days and an intramuscular 500 IU injections of PMSG were given to all ewes soon after sponges removal. Natural mating was made by the introduction of three adult rams to each group 24 hours after PMSG injction, these rams were taken out 25 days later. Jugular vein blood samples were taken from 15 ewes from each group at day 2, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33 from the start of mating to determine progesterone concentrations and corpus luteum activity. Lambing rates were recorded for each treatment group
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