| Journal: | Veterinaria noticias |
| Database: | PERIÓDICA |
| System number: | 000315634 |
| ISSN: | 0104-3463 |
| Authors: | Castilho, Calie1 Mori, Marco Miranda Alessi, Cynthia Pazzine Giuffrida, Rogerio |
| Institutions: | 1Universidade do Oeste Paulista, Campus II, Presidente Prudente, Sao Paulo. Brasil |
| Year: | 2007 |
| Season: | Ene-Jun |
| Volumen: | 13 |
| Number: | 1 |
| Pages: | 39-45 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | Experiment was conducted to evaluate the effect of estrus induction during the non-breeding season in primiparous and multiparous ewes using new or previously used progestagen implants. During 30 days, estrous behavior of the used sheep was made, with introduction of rams (teaser) per 1 week and after this period had been divided in 2 groups. Group 1 (G-1; n=15) was composed of 12 months old, primiparous ewes that received half progestagen auricular implant (Crestar® - Intervet, Holland) and 0.5 mL PGF2a (Day 0) (0.1325 mg cloprostenol, IM; Ciosin® - Schering-Plough Coopers). After nine days the ewes received 2 mL equine chorionic gonadotropin (eCG, 400 IU IM, Folligon® - Intervet, Holland) and progestagen implants were removed 24 hours later (day 10). Group 2 (G-2; n=26) was composed of 36 months old multiparous ewes, eight weeks postpartum, that received the same treatment described for G-1, except that in this group ewes received previously used progestagen implants (14 implants were used once in cows and 12 implants were used once in ewes). In the day of implants withdraw, two teaser rams fitted with marking harnesses were introduced into the flock and behavior was observed twice a day to determine the onset of estrus. In the G-1, 53.3% (8/15) of the ewes showed estrus approximately 48 hours after implants withdraw. In the G-2, 57.7% (15/26) of the ewes showed estrus, the majority of them (12/15) observed between 48 and 72 hours after implant withdraw. Estrus rate was similar between ewes that received implants previously used in cows (57.1%; 8/14) and ewes that received implants previously used in other ewes (58.3%; 7/12). During the 30 days of estrous behavior (control), made before the beginning of the experiments, without hormone use, no sheep showed estrous manifestation. We conclude that it is possible to induce estrus in over 50% of anestrus, primiparous or multiparous ewes using half of a new or previously used progestagen implant |
| Portuguese abstract | usando-se meio implante auricular sem uso (novo) ou utilizado uma vez |
| Disciplines: | Medicina veterinaria y zootecnia, Biología |
| Keyword: | Ovinos y caprinos, Reproducción y desarrollo, Estro, Ovejas, Progestágenos, Inducción |
| Keyword: | Veterinary medicine and animal husbandry, Biology, Sheep and goats, Reproduction and development, Oestrus, Ewes, Progestagens, Induction |
| Full text: | Texto completo (Ver HTML) |
