Academic Journal
Vitamin A deficiency as a cause of blindness in feedlot calves
| العنوان: | Vitamin A deficiency as a cause of blindness in feedlot calves |
|---|---|
| المؤلفون: | Rayane C. Pupin, Larissa L. Souza, Thaisa X. Silva, Helena Carolina F. Fonseca, Eduarda A.S. Silva, Danilo C. Gomes, Marcelo Augusto de Araújo, Ricardo Antônio A. Lemos |
| المصدر: | Pesquisa Veterinária Brasileira, Vol 43 (2023) |
| بيانات النشر: | Colégio Brasileiro de Patologia Animal (CBPA), 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Veterinary medicine |
| مصطلحات موضوعية: | Vitamin A, blindness, hypovitaminosis A, photoreceptor, retinal atrophy, rhodopsin, calf, cattle, Veterinary medicine, SF600-1100 |
| الوصف: | ABSTRACT: Vitamin A is an essential micronutrient to reproduction, development, normal growth, and function of the nervous system and vision, especially in growing animals. Hypovitaminosis A can affect any of these functions. The aim of this study was to describe the epidemiology, clinical signs, pathological aspects, and diagnostic approach in an outbreak of blindness in feedlot calves fed only grain. Five of 57 ten-month-old calves became blind after eight months at the feedlot. Clinical signs were mydriasis, absent pupillary and menace reflexes, bilaterally. Hypovitaminosis A was suspected and subsequently confirmed by low serum levels of vitamin A. One calf was euthanized and necropsied, and no gross findings were present. Histopathological lesions were restricted to the retina and characterized by degeneration and atrophy of the photoreceptor layer and some retinal scars. The calves were treated with intramuscular vitamin A injection at a dose of 5,000 international units (IU) per kilogram of body weight (kg BW) every 60 days until slaughter. Affected calves did not recover visual capacity, but no other cases occurred. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Portuguese |
| تدمد: | 1678-5150 |
| Relation: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-736X2023000100225&tlng=en; https://doaj.org/toc/1678-5150 |
| DOI: | 10.1590/1678-5150-pvb-7249 |
| URL الوصول: | https://doaj.org/article/ed54f3b8917a44f89dbaa06634527275 |
| رقم الانضمام: | edsdoj.54f3b8917a44f89dbaa06634527275 |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 16785150 |
|---|---|
| DOI: | 10.1590/1678-5150-pvb-7249 |