Forage Mineral Concentrations and Mineral Status of Beef Cattle Grazing Cool Season Pastures in Northwestern Florida, Emphasizing Magnesium

Autor:	Robert O. Myer, Lee Russell McDowell, J. N. Carter, Meghan Brennan, A. J. Spann, M. K. Maddox, N.S. Wilkinson
Rok vydání:	2010
Předmět:	geography geography.geographical_feature_category food and beverages Soil Science chemistry.chemical_element Forage Urine Biology Beef cattle Pasture medicine.anatomical_structure chemistry Agronomy Lactation Grazing medicine Qualitative inorganic analysis Agronomy and Crop Science Selenium
Zdroj:	Communications in Soil Science and Plant Analysis. 41:472-481
ISSN:	1532-2416 0010-3624
Popis:	A 68‐day study was conducted in North Florida to evaluate forage and beef cattle serum, liver, and urine mineral concentrations, emphasizing magnesium (Mg). Forty‐two Angus, Brangus, and Romosinuano cows in early lactation were divided into two groups and placed on ryegrass or oat pasture. Samples were collected every 2 weeks except for liver biopsies, which were collected only on day 68. Mineral concentrations were determined for forage, plasma, urine, and liver samples. All forage mineral concentrations except Mg, calcium (Ca), copper (Cu), cobalt (Co), selenium (Se), and zinc (Zn) were greater than critical levels for a beef cow in lactation. Forage Mg and Cu were severely deficient in both oats and ryegrass. All blood plasma mineral levels were greater than critical levels, but plasma Mg was borderline to slightly deficient. There should be special attention given to Mg supplementation because forages are deficient and contain excess potassium (K).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6e3498b3267570bffe1d8fa8c45d5f59 https://doi.org/10.1080/00103620903494400 Zobrazit plný text záznamu