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Patterns of bone remodeling in both sexes of bats indicate that new bone formation does not occur during hibernation: All new bone formation occurs during the summer\u2010active season. Results show that a short period of time elapses after hibernation before the initial demands of a large fetus and rapidly growing neonate are expressed on maternal skeletal reserves. Bone loss in summer\u2010active females was associated with pregnancy and lactation, whereas summer\u2010active males did not show evidence of bone loss but, instead, uninterrupted bone accretion throughout the summer\u2010active season. Osteoclasts and bone\u2010forming osteoblasts, absent during the hibernation period, reappeared on bone surfaces following spring\u2010arousal from hibernation. There was no apparent increase in osteoclast numbers or activity during lactation but resorption cavities were found in deep cortical lamellae distant from bone surfaces. The increase in bone resorption in lactating bats appeared to be by osteocytic osteolysis, suggesting that it might be a significant mechanism of bone\/calcium regulation in this hibernating mammal throughout the year.<\/jats:p>","DOI":"10.1002\/aja.1001780410","type":"journal-article","created":{"date-parts":[[2005,2,27]],"date-time":"2005-02-27T02:55:31Z","timestamp":1109472931000},"page":"410-420","source":"Crossref","is-referenced-by-count":75,"title":["Annual skeletal changes in the little brown bat, <i>Myotis lucifugus lucifugus<\/i>, with particular reference to pregnancy and lactation"],"prefix":"10.1002","volume":"178","author":[{"given":"Gary G.","family":"Kwiecinski","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lennart","family":"Krook","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"William A.","family":"Wimsatt","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,2,3]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.1970.tb03567.x"},{"key":"e_1_2_1_3_1","first-page":"5","article-title":"Sulle modificazioni cicliche stagionali e sperimentali dell'epitelio follicolare della tiroide di animali ibernanti","volume":"38","author":"Azzali G.","year":"1967","journal-title":"Ateneo Parmense Acta Biol.\u2010Med."},{"key":"e_1_2_1_4_1","volume-title":"Theory and Practice of Histological Technique","author":"Bancroft J. 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