| Revista: | Veterinaria México OA |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000425430 |
| ISSN: | 2007-5472 |
| Autors: | Mejía Villanueva, Octavio1 Hernández Cazadero, Verónica1 Murcia Mejía, Clara1 Rojas Maya, Susana1 Castaño García, Cristina2 Bóveda Gómez, Paula2 Salmerón Sosa, Frida1 Santiago Moreno, Julián2 |
| Institucions: | 1Universidad Nacional Autónoma de México, Facultad de Medicina Veterinaria y Zootecnia, Ciudad de México. México 2Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Departamento de Reproducción Animal, Madrid. España |
| Any: | 2018 |
| Període: | Jul-Sep |
| Volum: | 5 |
| Número: | 3 |
| País: | México |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | Gestations between bighorn (Ovis canadensis) and domestic sheep (O. aries) can be considered for ex situ conservation of bighorn. In the first experiment, domestic sheep were inseminated with bighorn or domestic semen. Bighorn inseminated sheep showed lower fertility than domestic inseminated sheep (40% vs. 65%, p = 0.11). Bighorn inseminated sheep had longer gestation periods (152.13 days vs. 146.54 days, p < 0.001) and lower progesterone levels during the last third. Hybrid lambs weighed less than domestic lambs (2.46 kg vs. 5.10 kg, p < 0.001). Their placentas were not as long (48.67 cm vs. 72.17 cm, p < 0.001), were less wide (17.83 cm vs. 23.83 cm, p < 0.001), and the weight of cotyledons was lower (1.50 g vs. 3.20 g, p < 0.001). In the second experiment, hybrid embryos (O. canadensis × O. aries) were transferred into domestic recipients, and pregnant ewes were divided into the treated group, which had a progesterone daily dose of 25 mg from weeks 7 to 20, and the non treated group. Gestation in domestic sheep that received one hybrid embryo and progesterone reached 152.60 days, which was similar to the 153.33 days (p = 0.51) in the non treated sheep. Hybrid offspring of the group treated with progesterone were heavier, 3.41 kg, than the control, 2.21 kg (p < 0.001), and their placentas were longer (71.20 vs. 50.83 cm, p = 0.002). Although progesterone levels were lower in domestic females inseminated with bighorn and in the recipients of hybrid embryos, it is possible to establish pregnancies between both species and the birth of viable offspring. The administration of progesterone during gestation increases the length of the placenta and promotes higher birth weights of hybrids |
| Disciplines | Medicina veterinaria y zootecnia |
| Paraules clau: | Reproducción y genética animal, Ovinos y caprinos, Cruzas interespecíficas, Crecimiento fetal, Progesterona, Ovis canadensis, Ovis aries |
| Keyword: | Animal reproduction and genetics, Sheep and goats, Interspecific crosses, Foetal growth, Progesterone, Ovis canadensis, Ovis aries |
| Text complet: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
