Impaired absorption of magnesium in theaetiology of grass tetany

Dua, K.; Care, A. D.

doi:10.1016/s0007-1935(95)80130-8

Cited by 29 publications

(23 citation statements)

References 68 publications

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“…Native grasses with adequate levels of K for growing beef cattle needs were also reported in several species growing in south (González and Everitt, 1982;Pinchak et al, 1989) and north Texas, USA (Ganskoop and Bohnert, 2001), northeastern Mexico (Ramírez et al, 2004) and Florida, USA (Kalmbacher, 1983). In this study, high levels of K (Table 3) may cause Mg deficiency because Mg is absorbed from the rumen by two active processes against an electrochemical gradient; the process is inhibited by K (Dua and Care, 1995). In this study, in all seasons, all grasses had insufficient amounts of Na to meet the requirements.…”

Section: Mineral Contentsupporting

confidence: 53%

Chemical composition and dry matter digestion of some native and cultivated grasses in Mexico

Ramírez¹,

González‐Rodríguez²,

Morales-Rodríguez³

et al. 2009

CZECH J ANIM SCI

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The objective of the study was to quantify differences in nutritive value, over four seasons, of native grasses such as Bouteloua curtipendula, Bouteloua trifida, Brachiaria fasciculata, Chloris ciliata, Digitaria insularis, Leptochloa filiformis, Panicum hallii, Panicum obtusum, Paspalum unispicatum, Setaria grisebachii, Setaria macrostachya, Tridens eragrostoides, Tridens muticus and naturalized chrus ciliaris and Rhynchelytrum repens that are used as forages for grazing beef cattle. Cenchrus ciliaris was included as a reference grass of good nutritional quality. Plants were collected in autumn 2001 and in winter, spring and summer 2002. The nutritive value was assessed in terms of nutrient content, effective rumen degradable dry matter (EDDM), metabolizable energy (ME) and metabolizable protein (MP). Most grasses had crude protein (CP) content comparable to the reference C. ciliaris grass (grand mean = 120 g/kg) and some of them had a higher content (140 g/kg). Cell wall (NDF) and lignin contents were lower in C. ciliaris (650 g/kg, 30, respectively) than in the other grasses (mean = 700 g/kg, 60, respectively). All grasses had less EDDM (mean = 420 g/kg) than C. ciliaris (470 g/kg). All grasses had the ME content (mean = 5.6 MJ/kg DM) that was lower for maintenance requirements of growing beef cattle. Conversely, mean MP values (67 g/kg DM) were sufficient. Lower content of P (annual mean = 120 g/kg DM), Na (0.3) and Cu (40 mg/kg DM) was detected in all grasses to meet the requirements of growing cattle. All grasses, in all seasons, had sufficient CP and MP content to meet the maintenance requirements of growing beef cattle. Higher levels of EDDM occurred in summer and autumn. Because of their good nutritional quality, grasses such as B. fasciculata, C. ciliata, P. hallii, P. obtusum, S. grisebachii, S. macrostachy and T. eragrostoides can be considered as good forages for ruminants.

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Section: Mineral Contentsupporting

confidence: 53%

Chemical composition and dry matter digestion of some native and cultivated grasses in Mexico

Ramírez¹,

González‐Rodríguez²,

Morales-Rodríguez³

et al. 2009

CZECH J ANIM SCI

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“…Obligatory losses of Mg occur via saliva, bile, and the gastric and pancreatic juices (Dua & Care, ; Storry, ). The volume of this secretion depends on DMI and the proposal of 0.2 g inevitable or obligatory secretion per kg DMI in the recommendation of the GfE () is a more precise estimate of inevitable secretion, but only if the DMI is known and constant.…”

Section: Discussionmentioning

confidence: 99%

Assessment of magnesium intake according to requirement in dairy cows

Martens

Stumpff

2019

Animal Physiology Nutrition

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To date, no specific hormonal regulation system has been identified for homoeostatic control of the essential mineral Mg. In cattle, the maintenance of physiological plasma Mg concentration depends on gastrointestinal absorption, primarily from the rumen, which serves as a pool for covering the requirement. Whereas a possible surplus (absorption greater than requirement) is rapidly excreted by the kidneys, a shortage (absorption lower than requirement) cannot be compensated for by mobilization from the large Mg pool in bones or soft tissue, so that the maintenance of the necessary physiological Mg concentration in plasma relies on continuous and sufficient absorption. Our knowledge concerning the site and mechanisms of Mg absorption has improved during the last few decades, and meta‐analyses of the absorption of Mg in dairy cows have shown that the K content has a pronounced negative effect on Mg digestibility. The current recommendations of Mg intake propose a constant percentage of Mg and emphasize the depressive effect of high potassium (K) intake on Mg absorption. The current knowledge about the antagonism between K intake and Mg absorption allows a more flexible solution which includes the K content of the diet. An assessment of Mg intake is proposed that incorporates the improved knowledge of Mg absorption, metabolism and requirement. Within this framework, an equation is derived that allows a prediction of the amount of Mg required to compensate for dietary K content, the goal being to avoid both possible undernutrition or an unnecessary surplus of dietary Mg.

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“…Selenite is absorbed from the small intestine by diffusion, stimulated in the presence of exceed 0.15 Pg and 0.18% in dry matter, respectively (NRC, 1985)-However, little certain thiols and selenate by a carrier mediated system shared with sulphate research has been conducted that evaluate (&.duser et al, 1986). ~l~~, recent development revealed that Mg absorption occurs within the reticulum-rumen (Ramirez et al, 1998;Ramirez and Zinn, 2000) via a Na-K-ATPase dependent process (Dua and Care, 1995). However, much of the dietary Se and Mg are probably converted to soluble or insoluble forms by ruminal microbes and thus decrease or increase its availability.…”

Section: Se and Mg Requirements Of Lambs Do Notmentioning

confidence: 99%