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Short communication: Estrus synchronization using progestogens or cloprostenol in tropical hair sheep |
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| Authors: | Alejandro Alavez Ramírez Jaime Arroyo Ledezma Ruben Montes Pérez Roberto Zamora Bustillos Luis Fernando Navarrete Sierra Hector Magaña Sevilla |
| Institution: | 1. Universidad Autónoma de Yucatán, Km 15.5 Carr., Mérida-Xmatkuil, CP 97300, Mexico 3. Universidad del Mar, Campus Puerto Escondido. Km 3.5 Carr. Puerto Escondido-Sola de Vega, CP 71980, Puerto Escondido, Oaxaca, Mexico 2. Insituto Tecnológico de Conkal, Km 16.3 antigua Carr., Mérida-Motul, CP 97345, Mexico |
| Abstract: | The objective of the experiment was to compare the use of a PGF2α analogue (Cloprostenol) IM, with an intravaginal progestagen sponge, flurogestone acetate (FGA), and equine chorionic gonadotropin (eCG) IM application protocol. A total of 30 cyclical hair ewes (54.07?±?0.5 kg live weight, body condition score 3.5?±?0.5, and age 3?±?1 years) were used. For the control group ewes (n?=?15), intravaginal sponges (IS) impregnated with 20 mg of FGA were inserted for 12 days with 500 IU of eCG IM at sponges withdrawal. For the PG group ewes (Treatment group n?=?15), two injections of Cloprostenol (75 mcg) were given 12 days apart. The presence of estrus was detected using two rams with 8 h interval beginning at the end of the treatment. Progesterone concentrations in blood were measured by solid phase radioimmunoassay. A student’s t test was performed to analyze the duration of estrus and the interval between the ends of the treatment and the onset of estrus (ET-OE) presentation. Progesterone levels were compared with two-way ANOVA, with treatment, and day of menstrual cycle as fixed factors. Treatment costs ratio was calculated by dividing the total costs of FGA IS application between total costs of Cloprostenol application. Significant differences (P?P? |
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