Variables influencing survival in four generations of captive-born muskoxen
Since 1967, four generations of muskoxen have been born in captivity in Alaska (399 live births, 18 abortions and 47 stillbirths), all derived from 20 females and 8 males captured on Nunivak Island. Analysis of juvenile survival was accomplished by dividing individuals into 7 classes (not born live,...
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| Format: | Article |
| Language: | English |
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Septentrio Academic Publishing
1993-12-01
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| Series: | Rangifer |
| Subjects: | |
| Online Access: | https://septentrio.uit.no/index.php/rangifer/article/view/1104 |
| _version_ | 1818212614658850816 |
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| author | P.C. Lent W.J. Davis |
| author_facet | P.C. Lent W.J. Davis |
| author_sort | P.C. Lent |
| collection | DOAJ |
| description | Since 1967, four generations of muskoxen have been born in captivity in Alaska (399 live births, 18 abortions and 47 stillbirths), all derived from 20 females and 8 males captured on Nunivak Island. Analysis of juvenile survival was accomplished by dividing individuals into 7 classes (not born live, born live but not surviving 48 hours, survived 48 hours but < 1 week, survived 1 week but < 1 month, survived 1 month but < 6 months, survived 6 months but < 2 years, survived 2 years). Males were more frequent among live born calves (219:178, P=0.05), but greater numbers of females survived to 2 years (62:86, P<0.01). Birthweight (X=9.75 kg, N=155) did not differ between sexes nor did it significantly influence survival. Of 463 individuals, 131 showed some inbreeding but no coefficients of inbreeding exceeded 0.25 and most were less than 0.13. Analysis of variance (Kruskal-Wallis) showed a significant (P<0.05) difference between survival of inbred and non-inbred individuals. Chi-squared tests showed a greater proportion of non-inbred calves surviving to 2 years (P<0.05) but no significant differences in perinatal mortality. Offspring of the Nunivak Island cows survived significantly (P<.01) longer than those whose mothers were born in captivity, even when only non-inbred calves were compared. |
| first_indexed | 2024-12-12T05:51:12Z |
| format | Article |
| id | doaj.art-e3465ef3f0bc4bf68f719fd37fdf40c1 |
| institution | Directory Open Access Journal |
| issn | 1890-6729 |
| language | English |
| last_indexed | 2024-12-12T05:51:12Z |
| publishDate | 1993-12-01 |
| publisher | Septentrio Academic Publishing |
| record_format | Article |
| series | Rangifer |
| spelling | doaj.art-e3465ef3f0bc4bf68f719fd37fdf40c12022-12-22T00:35:41ZengSeptentrio Academic PublishingRangifer1890-67291993-12-0113310.7557/2.13.3.11041040Variables influencing survival in four generations of captive-born muskoxenP.C. Lent0W.J. Davis1P.O. Box 101, Glenwood NM 88039, U.S.A.P.O. Box 101, Glenwood NM 88039, U.S.A.Since 1967, four generations of muskoxen have been born in captivity in Alaska (399 live births, 18 abortions and 47 stillbirths), all derived from 20 females and 8 males captured on Nunivak Island. Analysis of juvenile survival was accomplished by dividing individuals into 7 classes (not born live, born live but not surviving 48 hours, survived 48 hours but < 1 week, survived 1 week but < 1 month, survived 1 month but < 6 months, survived 6 months but < 2 years, survived 2 years). Males were more frequent among live born calves (219:178, P=0.05), but greater numbers of females survived to 2 years (62:86, P<0.01). Birthweight (X=9.75 kg, N=155) did not differ between sexes nor did it significantly influence survival. Of 463 individuals, 131 showed some inbreeding but no coefficients of inbreeding exceeded 0.25 and most were less than 0.13. Analysis of variance (Kruskal-Wallis) showed a significant (P<0.05) difference between survival of inbred and non-inbred individuals. Chi-squared tests showed a greater proportion of non-inbred calves surviving to 2 years (P<0.05) but no significant differences in perinatal mortality. Offspring of the Nunivak Island cows survived significantly (P<.01) longer than those whose mothers were born in captivity, even when only non-inbred calves were compared.https://septentrio.uit.no/index.php/rangifer/article/view/1104muskoxAlaskabreeding successabortioninbreedingmortality |
| spellingShingle | P.C. Lent W.J. Davis Variables influencing survival in four generations of captive-born muskoxen Rangifer muskox Alaska breeding success abortion inbreeding mortality |
| title | Variables influencing survival in four generations of captive-born muskoxen |
| title_full | Variables influencing survival in four generations of captive-born muskoxen |
| title_fullStr | Variables influencing survival in four generations of captive-born muskoxen |
| title_full_unstemmed | Variables influencing survival in four generations of captive-born muskoxen |
| title_short | Variables influencing survival in four generations of captive-born muskoxen |
| title_sort | variables influencing survival in four generations of captive born muskoxen |
| topic | muskox Alaska breeding success abortion inbreeding mortality |
| url | https://septentrio.uit.no/index.php/rangifer/article/view/1104 |
| work_keys_str_mv | AT pclent variablesinfluencingsurvivalinfourgenerationsofcaptivebornmuskoxen AT wjdavis variablesinfluencingsurvivalinfourgenerationsofcaptivebornmuskoxen |