The Efficiency of Melatonin Hormone Implantation in Suppressing the Estrus Cycle in Domesticated Queens (Felis catus)
The Efficiency of Melatonin Hormone Implantation in Suppressing the Estrus Cycle in Domesticated Queens (Felis catus)
Mushtaq A.Alabodi1*, Imad Majeed Almeeni2
ABSTRACT
The current study evaluated the efficiency of melatonin implants as a single subcutaneous dose to suppress or delay the estrus cycle in queens. Ten domesticated non-pregnant cats of known origin aged between 1-3 years were used. The cats were divided randomly into two groups. The first group (G1, n=5) was left without treatment and served as control group, and the second group (G2, n=5) was administered 18 mg melatonin implants as a single-dose subcutaneously. Before starting treatment at day zero, 3 ml of blood was collected from the jugular vein in all cats to measure estrogen and progesterone hormones. Post-treatment, the cats were monitored twice a day to determine the sexual behavior of estrus based on clinical signs, using a male detector and taking a swab from the vagina to confirm the estrus phase. Also, on days 14, 30 and 60 after treatment, reproductive hormones (estrogen and progesterone) were analyzed in the blood. The results of the current study revealed that interestrus days were significantly higher in the G2 group (111.00 ± 2.68 days) compared to the G1 group (28.00 ± 8.38 days), with a significant difference (P < 0.05). While there was a non-significant effect on estrus duration, with only a numerical increase (P > 0.05) in the estrus phase in G2 (9.20 ± 1.11 days) compared to the G1 group (7.00 ± 0.70 days). The estrogen and progesterone hormone levels were found varied in different periods, however they were remained at basal level (under 20 pg/ml and 2ng/ml respectively) in both groups. In conclusion, the melatonin implant suppresses the estrus cycle for 4 months without any adverse effects and maintains the concentration of estrogen E2 and progesterone hormones at the basal level.
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