Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition
International audience Milk composition was investigated throughout the 10-mo puprearing period in subantarctic fur seals (Arctocephalus tropicalis) breeding on Amsterdam Island. The mean milk composition was lipid, protein, 42.8%5.7% 12.1%1.5% and 42.6%7.3% water. Subantarctic fur seals breeding on...
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ftccsdartic:oai:HAL:hal-00192441v1 2023-05-15T13:22:26+02:00 Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition Georges, Jean-Yves Groscolas, René Guinet, Christophe Robin, Jean-Patrice Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Laboratoire de Biochimie et Biologie Marines Université de La Rochelle (ULR) Département Ecologie, Physiologie et Ethologie (DEPE-IPHC) Institut Pluridisciplinaire Hubert Curien (IPHC) Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) 2001 https://hal.archives-ouvertes.fr/hal-00192441 en eng HAL CCSD University of Chicago Press hal-00192441 https://hal.archives-ouvertes.fr/hal-00192441 ISSN: 1522-2152 EISSN: 1537-5293 Physiological and Biochemical Zoology https://hal.archives-ouvertes.fr/hal-00192441 Physiological and Biochemical Zoology, University of Chicago Press, 2001, 74 (4), pp.548-559 [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society info:eu-repo/semantics/article Journal articles 2001 ftccsdartic 2021-10-24T21:41:42Z International audience Milk composition was investigated throughout the 10-mo puprearing period in subantarctic fur seals (Arctocephalus tropicalis) breeding on Amsterdam Island. The mean milk composition was lipid, protein, 42.8%5.7% 12.1%1.5% and 42.6%7.3% water. Subantarctic fur seals breeding on Amsterdam Island produced one of the richest milks ever reported in otariids (20.42.9 kJ/g), with lipid content contributing 85% of total gross energy. The high lipid levels measured in themilk of subantarctic fur seals breeding on AmsterdamIsland is consistent (i) with the relatively long time lactating females spend at sea, due to the relatively poor local trophic conditions near the colony that necessitate that they travel long distances to reach the foraging grounds, and (ii) with the consequently short time mothers spend with their pups ashore. Milk composition changed according to the time mothers were fasting ashore: milk produced during the first 2 d spent ashore, when more than 80% of milk transfer occurred, had higher levels of lipids, proteins, and gross energy than milk produced later during the visit ashore, suggesting that the pups were fed with two types of milk during a suckling period. Throughout the year, mothers in good condition produced milk of higher lipid content than others, suggesting that individual foraging skills contribute to enhance milk quality. Milk lipid and gross energy content varied with pup age, according to quadratic relationships, increasing during the earlier stages of lactation before reaching asymptotic values when pups were 180 d old. The stage of lactation appears to be a better predictor of milk lipid content than the duration of the preceding foraging trip, suggesting that either changes in the nutritional requirements of the pup and/or seasonal changes in trophic conditions act on milk composition. These changes in milk quality may also be related to changes in maternal care; lactating subantarctic fur seals apparently reallocate their body reserves toward gestation ... Article in Journal/Newspaper Amsterdam Island Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society Georges, Jean-Yves Groscolas, René Guinet, Christophe Robin, Jean-Patrice Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
description |
International audience Milk composition was investigated throughout the 10-mo puprearing period in subantarctic fur seals (Arctocephalus tropicalis) breeding on Amsterdam Island. The mean milk composition was lipid, protein, 42.8%5.7% 12.1%1.5% and 42.6%7.3% water. Subantarctic fur seals breeding on Amsterdam Island produced one of the richest milks ever reported in otariids (20.42.9 kJ/g), with lipid content contributing 85% of total gross energy. The high lipid levels measured in themilk of subantarctic fur seals breeding on AmsterdamIsland is consistent (i) with the relatively long time lactating females spend at sea, due to the relatively poor local trophic conditions near the colony that necessitate that they travel long distances to reach the foraging grounds, and (ii) with the consequently short time mothers spend with their pups ashore. Milk composition changed according to the time mothers were fasting ashore: milk produced during the first 2 d spent ashore, when more than 80% of milk transfer occurred, had higher levels of lipids, proteins, and gross energy than milk produced later during the visit ashore, suggesting that the pups were fed with two types of milk during a suckling period. Throughout the year, mothers in good condition produced milk of higher lipid content than others, suggesting that individual foraging skills contribute to enhance milk quality. Milk lipid and gross energy content varied with pup age, according to quadratic relationships, increasing during the earlier stages of lactation before reaching asymptotic values when pups were 180 d old. The stage of lactation appears to be a better predictor of milk lipid content than the duration of the preceding foraging trip, suggesting that either changes in the nutritional requirements of the pup and/or seasonal changes in trophic conditions act on milk composition. These changes in milk quality may also be related to changes in maternal care; lactating subantarctic fur seals apparently reallocate their body reserves toward gestation ... |
author2 |
Centre d'études biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Laboratoire de Biochimie et Biologie Marines Université de La Rochelle (ULR) Département Ecologie, Physiologie et Ethologie (DEPE-IPHC) Institut Pluridisciplinaire Hubert Curien (IPHC) Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Georges, Jean-Yves Groscolas, René Guinet, Christophe Robin, Jean-Patrice |
author_facet |
Georges, Jean-Yves Groscolas, René Guinet, Christophe Robin, Jean-Patrice |
author_sort |
Georges, Jean-Yves |
title |
Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition |
title_short |
Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition |
title_full |
Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition |
title_fullStr |
Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition |
title_full_unstemmed |
Milking Strategy in Subantarctic Fur Seals Arctocephalus tropicalis Breeding on Amsterdam Island: Evidence from Changes in Milk Composition |
title_sort |
milking strategy in subantarctic fur seals arctocephalus tropicalis breeding on amsterdam island: evidence from changes in milk composition |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.archives-ouvertes.fr/hal-00192441 |
genre |
Amsterdam Island |
genre_facet |
Amsterdam Island |
op_source |
ISSN: 1522-2152 EISSN: 1537-5293 Physiological and Biochemical Zoology https://hal.archives-ouvertes.fr/hal-00192441 Physiological and Biochemical Zoology, University of Chicago Press, 2001, 74 (4), pp.548-559 |
op_relation |
hal-00192441 https://hal.archives-ouvertes.fr/hal-00192441 |
_version_ |
1766364884004503552 |