Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia
Boran is an endangered breed of cattle indigenous to Ethiopia and the relatively poor understanding of its reproductive physiology has impeded efforts to maximize reproductive performance of the breed. This study characterized ovarian follicular dynamics in 9 purebred Boran and 8 Boran×Holstein (B×H...
| Autores principales: | , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
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Academic Journals
2016
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| Acceso en línea: | https://hdl.handle.net/10568/89132 |
| _version_ | 1855526828404375552 |
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| author | Degefa, T. Lemma, Alemayehu Jemal, J. Mamo, G. Tegegne, Azage Youngs, C. |
| author_browse | Degefa, T. Jemal, J. Lemma, Alemayehu Mamo, G. Tegegne, Azage Youngs, C. |
| author_facet | Degefa, T. Lemma, Alemayehu Jemal, J. Mamo, G. Tegegne, Azage Youngs, C. |
| author_sort | Degefa, T. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Boran is an endangered breed of cattle indigenous to Ethiopia and the relatively poor understanding of its reproductive physiology has impeded efforts to maximize reproductive performance of the breed. This study characterized ovarian follicular dynamics in 9 purebred Boran and 8 Boran×Holstein (B×H) crossbred cows. Ovaries of all 17 cows were examined once per day for 61 consecutive days (encompassing three periods of estrus) using transrectal ultrasonography. The mean (±standard error of mean) inter-ovulatory interval (IOI) was similar (P>0.05) in Boran (19.4 ± 0.2 days) and B×H cows (20.1 ± 0.4 days). Two (in 79% of estrous cycles) or three (in 21% of cycles) follicular waves per IOI were observed and IOI was shorter (P0.10) in both genotypes (15.8 ± 1.5 mm in Boran and 19.4 ± 2.9 mm in B×H). Boran cows possessed a greater (P<0.001) total number of ovarian follicles than BxH cows and both genotypes displayed more (P<0.05) activity on their right than left ovary. Results of our study have provided novel insights into the normal reproductive physiology of the Boran breed. |
| format | Journal Article |
| id | CGSpace89132 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Academic Journals |
| publisherStr | Academic Journals |
| record_format | dspace |
| spelling | CGSpace891322024-04-25T06:01:03Z Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia Degefa, T. Lemma, Alemayehu Jemal, J. Mamo, G. Tegegne, Azage Youngs, C. cattle livestock Boran is an endangered breed of cattle indigenous to Ethiopia and the relatively poor understanding of its reproductive physiology has impeded efforts to maximize reproductive performance of the breed. This study characterized ovarian follicular dynamics in 9 purebred Boran and 8 Boran×Holstein (B×H) crossbred cows. Ovaries of all 17 cows were examined once per day for 61 consecutive days (encompassing three periods of estrus) using transrectal ultrasonography. The mean (±standard error of mean) inter-ovulatory interval (IOI) was similar (P>0.05) in Boran (19.4 ± 0.2 days) and B×H cows (20.1 ± 0.4 days). Two (in 79% of estrous cycles) or three (in 21% of cycles) follicular waves per IOI were observed and IOI was shorter (P0.10) in both genotypes (15.8 ± 1.5 mm in Boran and 19.4 ± 2.9 mm in B×H). Boran cows possessed a greater (P<0.001) total number of ovarian follicles than BxH cows and both genotypes displayed more (P<0.05) activity on their right than left ovary. Results of our study have provided novel insights into the normal reproductive physiology of the Boran breed. 2016-08-17 2017-10-30T16:01:55Z 2017-10-30T16:01:55Z Journal Article https://hdl.handle.net/10568/89132 en Open Access Academic Journals Degefa, T., Lemma, A., Jemal, J., Mamo, G., Tegegne, A. and Youngs, C.R. 2016. Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia. African Journal of Biotechnology 15(33):1763-1770. |
| spellingShingle | cattle livestock Degefa, T. Lemma, Alemayehu Jemal, J. Mamo, G. Tegegne, Azage Youngs, C. Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia |
| title | Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia |
| title_full | Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia |
| title_fullStr | Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia |
| title_full_unstemmed | Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia |
| title_short | Ovarian follicular dynamics in purebred and crossbred Boran cows in Ethiopia |
| title_sort | ovarian follicular dynamics in purebred and crossbred boran cows in ethiopia |
| topic | cattle livestock |
| url | https://hdl.handle.net/10568/89132 |
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