{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,23]],"date-time":"2026-04-23T06:21:38Z","timestamp":1776925298406,"version":"3.51.2"},"reference-count":20,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2017,2,27]],"date-time":"2017-02-27T00:00:00Z","timestamp":1488153600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Aust Veterinary J"],"published-print":{"date-parts":[[2017,3]]},"abstract":"<jats:sec><jats:title>Case report<\/jats:title><jats:p>Vitamin A deficiency was diagnosed in a herd of 97 19\u2010month\u2010old Braford heifers in the Mitchell Grass Downs <jats:italic>(Astrebla<\/jats:italic> spp.) bioregion of Hughenden in north\u2010western Queensland during November 2015. Two heifers died after a 48\u2010h history of sternal recumbency and of the 19 that had neurological signs, 7 were blind. Histological changes in the optic nerves of the two necropsied cattle were consistent with vitamin A deficiency. This diagnosis was supported by vitamin A concentrations in fresh liver samples of 5 and 6\u2009mg\/kg wet tissue (reference range, 100\u2013175\u2009mg\/kg) despite treatment of the cattle with twice the recommended dose of parenteral vitamin A 3 weeks prior to sampling. Rainfall on the property during the 2 years before the outbreak was less than the annual rainfall average of 464\u2009mm, with a total of 281\u2009mm in 2014 and 117\u2009mm from January to November in 2015, most of this falling in January.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Plant assays for both \u03b2\u2010carotene and crude protein concentrations in dry matter (<jats:styled-content style=\"fixed-case\">DM<\/jats:styled-content>) were less than the recommended dietary requirements for beef cattle (0.30\u2009mg\/kg <jats:styled-content style=\"fixed-case\">DM<\/jats:styled-content> and 56\u2009g\/kg, respectively).<\/jats:p><\/jats:sec>","DOI":"10.1111\/avj.12560","type":"journal-article","created":{"date-parts":[[2017,2,27]],"date-time":"2017-02-27T06:25:32Z","timestamp":1488176732000},"page":"80-84","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Hypovitaminosis A in extensively grazed beef cattle"],"prefix":"10.1111","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4846-1925","authenticated-orcid":false,"given":"EM","family":"Parker","sequence":"first","affiliation":[{"name":"College of Public Health, Medical and Veterinary Sciences James Cook University  Townsville Queensland Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"CP","family":"Gardiner","sequence":"additional","affiliation":[{"name":"College of Public Health, Medical and Veterinary Sciences James Cook University  Townsville Queensland Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"AE","family":"Kessell","sequence":"additional","affiliation":[{"name":"College of Public Health, Medical and Veterinary Sciences James Cook University  Townsville Queensland Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"AJ","family":"Parker","sequence":"additional","affiliation":[{"name":"College of Public Health, Medical and Veterinary Sciences James Cook University  Townsville Queensland Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,2,27]]},"reference":[{"key":"e_1_2_7_2_1","volume-title":"Animal health in Australia. 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