| Journal: | Brazilian journal of veterinary research and animal science |
| Database: | PERIÓDICA |
| System number: | 000291537 |
| ISSN: | 1413-9596 |
| Authors: | Luz, Sergio Luis Nadal da1 Neves, Jairo Pereira2 Goncalves, Paulo Bayard Dias |
| Institutions: | 1Universidade Tuiuti do Parana, Faculdade de Veterinaria, Curitiba, Parana. Brasil 2Universidade Federal de Santa Maria, Departamento de Clinica de Grandes Animais, Santa Maria, Rio Grande do Sul. Brasil |
| Year: | 2000 |
| Volumen: | 37 |
| Number: | 2 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | The aim of the present study was to verify some parameters for evaluating frozen semen, throughout pregnancy rate, in sheep. Two hundred and ninety-seven ewes from the Corriedale breed were inseminated by laparoscopic method. The estrus were synchronized with intravaginal sponge, containing 50 mg of MAP (medroxyprogesterone acetate), for 12 days and eCG (Equine Chorionic Gonadotrophin; 400 IU) was given in a single intramuscular injection at the moment of withdrawing the sponges. The semen from 32 rams was frozen in pellets. Semen of different qualities was used. The quality of the semen was determined by evaluating sperm motility at thawing, sperm motility after 5 hours incubation, the mean of sperm motility during incubation period (0, 1, 2, 3, 4 and 5 hours) and the percentage of normal sperm cells. Each of these parameters was correlated with pregnancy after laparoscopic insemination. The diagnosis of pregnancy was performed by ultrasonography at 40 days after insemination. The percentages of pregnancy were from 60% to 80% only when the sperm samples exhibited sperm motility higher than 40% (68.1), mean of sperm motility and after thawing at least of 20% (64.4 and 72.3) and sperm motility after 5 hours of incubation superior to 10% (61.1 and 78.6). With regard to the percentage of viable cells, the samples with at least 40% of sperm motility resulted in 61.8% and 66.4% of pregnancy while sperm motility less than 40% resulted in only 15.2%. The parameters investigated were efficient to evaluate the capacity of frozen semen to fertilize sheep to use in laparoscopic insemination |
| Portuguese abstract | Com a finalidade de verificar o valor de alguns atributos para avaliação da qualidade do sêmen congelado, através da prenhez, duzentas e noventa e sete ovelhas da raça Corriedale foram inseminadas, intra-uterinamente, por laparoscopia. Utilizou-se cio sincronizado, com pessários vaginais contendo 50 mg de MAP (acetato de medroxiprogesterona), por 12 dias, e 400 UI de eCG (Equine chorionic gonadotrophin) no 12º dia. O sêmen, proveniente de 32 carneiros, foi congelado em pellets. Para a inseminação, utilizaram-se amostras de sêmen com diferentes padrões de qualidade preestabelecida, de motilidade progressiva (MP) ao descongelamento, média da MP durante todo o período de incubação (0, 1, 2, 3, 4 e 5 horas), a 37ºC, MP após cinco horas de incubação e percentagem de células, morfologicamente, íntegras. O diagnóstico de gestação foi realizado por ecografia 40 dias após a inseminação. Obtiveram-se percentuais de prenhez entre 60 e 80% somente quando as amostras apresentaram um movimento progressivo superior a 40% (68,0%), uma MP média e após 5 horas de incubação mínima de 20% (64,4 e 72,3%) e uma MP às 5 horas de incubação quando superior a 10% (61,1 e 78,5%). Com relação ao percentual de células íntegras, as amostras com um mínimo de 40% proporcionaram prenhez de 61,7 e 66,4%, enquanto nas com menos de 40% o percentual foi de apenas 15,2%. Os parâmetros estudados demonstraram eficiência para estimar a capacidade fecundante do sêmen congelado para utilização em inseminação laparoscópica |
| Disciplines: | Medicina veterinaria y zootecnia |
| Keyword: | Ovinos y caprinos, Reproducción y desarrollo, Ovejas, Congelación, Semen, Inseminación artificial, Laparoscopia |
| Keyword: | Veterinary medicine and animal husbandry, Sheep and goats, Reproduction and development, Freezing, Semen, Artificial insemination, Laparoscopy, Sheep |
| Full text: | Texto completo (Ver HTML) |
