Genetic influences on reproduction of female red deer (Cervus elaphus)
| Autor: | K.T. O'Neill, M.W. Fisher, Bruce G. Mockett, G.W. Asher, I. C. Scott |
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| Rok vydání: | 2000 |
| Předmět: |
Estrous cycle
medicine.medical_specialty Elaphurus davidianus animal diseases media_common.quotation_subject General Medicine Luteal phase Biology biology.organism_classification Endocrinology Animal science Food Animals Blood chemistry Internal medicine Follicular phase Backcrossing medicine Seasonal breeder Animal Science and Zoology Reproduction Ovulation Blood sampling media_common Hybrid |
| Zdroj: | Animal Reproduction Science. 59:61-70 |
| ISSN: | 0378-4320 |
| DOI: | 10.1016/s0378-4320(00)00066-x |
| Popis: | This study evaluated the influences of seasons and genotype on the superovulatory response to a standardised oFSH regimen in red deer ( Cervus elaphus scoticus ) and its hybrids with either wapiti ( C.e. nelsoni ) or Pere David's (PD) deer ( Elaphurus davidianus ). Adult red deer ( n =9), F 1 hybrid wapiti×red deer ( n =6), and maternal backcross hybrid PD×red deer (i.e., 14 PD hybrid; n =9) were kept together in the presence of a vasectomised stag for 13 months. At 6 weekly intervals, all hinds received a standardised treatment regimen used routinely to induce a superovulatory response in red deer hinds, with 10 consecutive treatments spanning an entire year. This involved synchronisation with intravaginal progesterone devices and delivery of multiple injections of oFSH (equivalent to 72 units NIH-FSH-S 1 ). Laparoscopy to assess ovarian response was performed 6–7 days after the removal of the devices. Both season and genotype had significant effects on ovulation rate (OR) and total follicular stimulation (TFS) ( P 1 wapiti hybrids, the first two treatments in March and April resulted in the highest mean OR observed (15.6 and 11.7, respectively). Thereafter, mean values ranged between 6.3 and 4.7 for the remainder of the breeding season. Furthermore, mean OR of 3.0 and 0.5 were recorded in December and January, respectively. For the red deer and F 1 wapiti hybrids, between-hind variation in OR was not randomly distributed across the treatment dates, indicating that the individuals varied significantly in their ability to respond to oFSH, at least within a given season. In conclusion, the study has shown that relative to red deer, F 1 wapiti hybrid hinds exhibit a higher sensitivity to oFSH, whereas 14 PD hybrid hinds have a lower sensitivity. However, individual variation within genotype was very marked. A seasonal effect was apparent for all genotypes, although some F 1 wapiti hybrid hinds exhibited ovulatory responses throughout the year. |
| Databáze: | OpenAIRE |
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