Ovary, reproduction, and productivity of female columbian black-tailed deer
Notice bibliographique
Résumé
Ovarian changes, patterns of reproduction, and age-specific productivity of female Columbian black-tailed deer (Odocoileus hemionus columbianus) on Vancouver Island were elucidated largely by examination of serial, stained sections of ovaries from 444 females. Well-defined, 8 or 9-day, follicular cycles occur during the breeding season in November and early December. Many follicles rupturing at first ovulation are asynchronous and of extreme sizes. Relatively small (4-5 mm³), short-lived (8-day) corpora lutea develop after first ovulation; these rapidly regress after second ovulation, while the corpora lutea of pregnancy grow to 100 mm³, within 5-8 days. The changes in ovarian structures during the breeding season were ascertained in 12 females, whose follicles and corpora lutea were dated by the cleavage stage of fertilized ova. These provided criteria for estimating ovulation dates in other females. In each cycle, about 50% of the adult females ovulated within an 8-day period. The mean date of first ovulation in each of the 5 years was approximately November 16; the second ovulation followed after a remarkably short period of 8-9 days. About 96% of the females conceived at second ovulation and 4% on subsequent ovulations. A high proportion of 'silent heats' accompany first ovulation, as indicated by lack of sperm on four of six ova. Growth curves, based on fetuses conceived at second ovulation, provided the conception dates of two late conceivers—those containing more than one generation of regressed corpora lutea of non-pregnancy. Females may cycle at least five times if pregnancy does not occur. Accessory corpora lutea develop in large and small unruptured follicles, in small ruptured follicles, and in regressing corpora lutea. They occurred in 47% of females between first and second ovulation and in 36% of pregnant females. Minimum loss of ova was 8.3% in all females that produced corpora lutea and 4.3% in females that became pregnant, of which 3.1% was moribund fetuses. Corpora lutea of pregnancy, corresponding to the number of fetuses, develop into distinctive scars, which persist for the life of the doe. Pregnancy rates of the previous season, as well as the long term productivity of individuals and the population, were estimated from these. The average number of viable fetuses per doe increased progressively from 0.91 in yearlings to 1.81 in the 5-5 to 6.5 age-classes, and thereafter decreased. These changes in fertility with age were mirrored by changes in weight and girth. The relative contribution of fawns by each age-class in the population progressively decreased with age. One hundred females of reproductive age produced about 137 fawns.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,002 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».