Calving time and foetus growth among wild reindeer in Norway
Mean calving dates among 7 wild reindeer (Rangifer t. tarandus) herds in southern Norway varied between the 6th and the 27th of May. Ln transformed foetus weights relate linearly to ln age in days. Regression analyzes based upon 225 days pregnancy predicts birth wet weights between 4600 and 7500 g i...
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2002
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ftdoajarticles:oai:doaj.org/article:5280aa9280ea4591ad9d3cc4ac493fe4 2023-05-15T18:03:56+02:00 Calving time and foetus growth among wild reindeer in Norway Eigil Reimers 2002-06-01T00:00:00Z https://doi.org/10.7557/2.22.1.689 https://doaj.org/article/5280aa9280ea4591ad9d3cc4ac493fe4 EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/rangifer/article/view/689 https://doaj.org/toc/1890-6729 doi:10.7557/2.22.1.689 1890-6729 https://doaj.org/article/5280aa9280ea4591ad9d3cc4ac493fe4 Rangifer, Vol 22, Iss 1 (2002) birth weight carcass weight calving date foetus development gestation Rangifer tarandus Animal culture SF1-1100 article 2002 ftdoajarticles https://doi.org/10.7557/2.22.1.689 2022-12-31T04:03:22Z Mean calving dates among 7 wild reindeer (Rangifer t. tarandus) herds in southern Norway varied between the 6th and the 27th of May. Ln transformed foetus weights relate linearly to ln age in days. Regression analyzes based upon 225 days pregnancy predicts birth wet weights between 4600 and 7500 g in the different areas and years. At 130 days, foetus weights varied between 547 and 746 g (mean=681, standard deviation s=63) in all areas and years, indicating that foetus growth up to this size is independent of mothers body weight or condition. During the remaining 95 days of pregnancy, very poor body condition, reflected in dressed weights, resulted in slower foetus growth and smaller regression estimated birth weights. The foetus weight variation recorded at similar dates within areas and sampling years indicates a dispersed breeding time mostly within two ovulations. A small sample of foetuses from pregnant yearlings and calves indicate that these cohorts conceive later than 2 yr + females. Assuming similar foetus growth pattern among all female age cohorts within areas, yearlings conceive around 1 week later and calves (in Ottadalen) more than 3 weeks later than 2 + yr olds. Article in Journal/Newspaper Rangifer Rangifer tarandus Directory of Open Access Journals: DOAJ Articles Norway Rangifer 22 1 61 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
birth weight carcass weight calving date foetus development gestation Rangifer tarandus Animal culture SF1-1100 |
spellingShingle |
birth weight carcass weight calving date foetus development gestation Rangifer tarandus Animal culture SF1-1100 Eigil Reimers Calving time and foetus growth among wild reindeer in Norway |
topic_facet |
birth weight carcass weight calving date foetus development gestation Rangifer tarandus Animal culture SF1-1100 |
description |
Mean calving dates among 7 wild reindeer (Rangifer t. tarandus) herds in southern Norway varied between the 6th and the 27th of May. Ln transformed foetus weights relate linearly to ln age in days. Regression analyzes based upon 225 days pregnancy predicts birth wet weights between 4600 and 7500 g in the different areas and years. At 130 days, foetus weights varied between 547 and 746 g (mean=681, standard deviation s=63) in all areas and years, indicating that foetus growth up to this size is independent of mothers body weight or condition. During the remaining 95 days of pregnancy, very poor body condition, reflected in dressed weights, resulted in slower foetus growth and smaller regression estimated birth weights. The foetus weight variation recorded at similar dates within areas and sampling years indicates a dispersed breeding time mostly within two ovulations. A small sample of foetuses from pregnant yearlings and calves indicate that these cohorts conceive later than 2 yr + females. Assuming similar foetus growth pattern among all female age cohorts within areas, yearlings conceive around 1 week later and calves (in Ottadalen) more than 3 weeks later than 2 + yr olds. |
format |
Article in Journal/Newspaper |
author |
Eigil Reimers |
author_facet |
Eigil Reimers |
author_sort |
Eigil Reimers |
title |
Calving time and foetus growth among wild reindeer in Norway |
title_short |
Calving time and foetus growth among wild reindeer in Norway |
title_full |
Calving time and foetus growth among wild reindeer in Norway |
title_fullStr |
Calving time and foetus growth among wild reindeer in Norway |
title_full_unstemmed |
Calving time and foetus growth among wild reindeer in Norway |
title_sort |
calving time and foetus growth among wild reindeer in norway |
publisher |
Septentrio Academic Publishing |
publishDate |
2002 |
url |
https://doi.org/10.7557/2.22.1.689 https://doaj.org/article/5280aa9280ea4591ad9d3cc4ac493fe4 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Rangifer Rangifer tarandus |
genre_facet |
Rangifer Rangifer tarandus |
op_source |
Rangifer, Vol 22, Iss 1 (2002) |
op_relation |
https://septentrio.uit.no/index.php/rangifer/article/view/689 https://doaj.org/toc/1890-6729 doi:10.7557/2.22.1.689 1890-6729 https://doaj.org/article/5280aa9280ea4591ad9d3cc4ac493fe4 |
op_doi |
https://doi.org/10.7557/2.22.1.689 |
container_title |
Rangifer |
container_volume |
22 |
container_issue |
1 |
container_start_page |
61 |
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1766175161877266432 |