Reyes-Delgado, Alexandra

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    Ovulation and corpus luteum development after synchronization with a progesterone delivery device (CIDR) plus prostaglandin or prostaglandin alone under tropical conditions in hair breed sheep
    (2017) Reyes-Delgado, Alexandra; Arcelay-Ruíz, Enid; College of Agricultural Sciences; Ratto-Fuster, Dr. Marcelo; Sánchez-Rodríguez, Dr. Héctor L.; Latorre-Acevedo, Dr. José R.; Department of Animal Science; Parés-Matos, Dr. Elsie I.
    This investigation has focused in studying differences in the ovulation rate and the corpus luteum (CL) formation by utilizing two ovulation synchronization protocols based on the use of a controlled internal drug releasing (CIDR) device combined with prostaglandin (PG), or administration of PG without a CIDR. A total of 40 crossbreed Barbados Blackbelly x White Virgin Island ewes were used for this study. Ewes were maintained in a paddock of 100 m2 at Ross University School of Veterinary Medicine (17.3º N, 62.7º W) in St. Kitts. They were assigned randomly at different stages of the estrous cycle and separated into two groups (20 ewes / group). In the CIDR+PG group, ewes received an application of a CIDR device for 7 days and PG (10 mg, i.m., Lutalyse, dinoprost tromethamine) was administered at CIDR device removal. The PG group received an administration of PG (10 mg, i.m., Lutalyse, dinoprost tromethamine) with 10 days apart. After treatment, ovaries were examined daily, for 21 days, by transrectal B-mode ultrasonography using a 7.5 MHz lineal array transducer to determine ovulation and CL development. Ovulation was defined as the detection of a large follicle (> 4 mm) at one examination, and was absent at the next examination. The interval from treatment to ovulation was considered as the time between CIDR device removal for Group CIDR+PG and the second injection of PG for the PG group. The day-to-day profile of CL area affected by treatment (p < 0.002), and by time (p < 0.0001). The CL area was greater in single (p < 0.01) than in double ovulations observed in the CIDR+PG group. Plasma progesterone concentrations were also affected by treatment (p < 0.0001) and by time (p < 0.0001). In conclusion, application of CIDR+PG to ewes under tropical conditions resulted in a high degree of synchronized ovulation and a visually enhanced structural development of the CL, as compared to PG alone, especially in those animals with single ovulation.