The influence of heavily fertilized grass on mineral metabolism of dairy cows

Mudd, AJ

doi:10.1017/s0021859600020906

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…In these experiments calcium concentration of the mixed herbage averaged 5-8 g/kg D.M. This value is close to those reported by Simpson (1964), Hemingway et al (1968), Adams (1973) and Whitehead, Jones & Barnes (1978), Heddle & Crooks (1967), Crawshaw (1970) and Mudd (1970).…”

Section: Calciumsupporting

confidence: 91%

“…Magnesium concentration of the mixed herbage averaged 1-7 g/kg D.M., similar to that found by Whitehead et al (1978). Mudd (1970) reported a lower value (1-5 g/kg D.M.) while other authors (Reith et al 1964;Heddle & Crooks, 1967;Crawshaw, 1970;Adams, 1973) found higher values ranging from 1-7 to 2-2 g/kg D.M.…”

Section: Magnesiumsupporting

confidence: 83%

“…The mineral status of pasture cut for silage 203 Reith et al (1964), Mudd (1970), Adams (1973) and Whitehead et al (1978). At the second cut, nitrogen effects were variable and inconclusive.…”

Section: Magnesiummentioning

confidence: 99%

“…The lameness was ascribed not to a deficiency of dietary phosphorus which was at a normal level, but to the fact that high-yielding cows were unable to satisfy their requirements for phosphorus at a time of high rainfall and low sunshine. Mudd (1970) reported that heavy applications of nitrogen to pasture resulted in negative calcium balances in dairy cows consuming the grass. Heavy applications of potassium depressed the calcium and phosphorus concentrations of the herbage; the availability of calcium to the cows was reduced.…”

mentioning

confidence: 99%

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The effect of fertilizer nitrogen, phosphorus and potassium on the calcium, magnesium and phosphorus status of pasture cut for silage

Rodger

1982

J. Agric. Sci.

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Physiological problems in some Fife dairy herds were thought to be associated with mineral imbalance in grass cut for silage. Consequently trials at two sites were conducted to study the effects of three levels of nitrogen and phosphorus and two levels of potassium on yield and composition of pasture cut for silage.Nitrogen increased yield of herbage and reduced its clover content whereas phosphorus and potassium had little effect on yield or clover content. Herbage clover content and calcium concentration declined over the period of the experiment. Mean concentrations of calcium, magnesium and phosphorus were 5-8, 1-7 and 3-4 g/kg respectively. Concentrations of these minerals varied more with time of cutting and with season than with level of applied phosphorus and potassium.Nitrogen tended to reduce calcium concentration in mixed herbage and to increase magnesium concentration in the grass component; it did not affect herbage phosphorus concentrations, but narrowed the calcium-phosphorus ratio in the second cuts. Applied phosphorus increased herbage phosphorus concentration only at the site with the lower soil phosphorus status. Potassium tended to reduce magnesium concentration in clover and, at one site, in mixed herbage; it also tended to reduce herbage phosphorus concentrations in second cuts.Mineral uptake was increased by applied nitrogen. Mean annual uptake of calcium magnesium and phosphorus was 34, 10 and 20 kg/ha respectively.The effects of treatments on concentration and balance of these minerals are discussed in relation to ruminant requirements and maintenance of suitable levels of the minerals in the soil.It is concluded that normal applications of NPK fertilizer are not detrimental to satisfactory mineral balance in pasture.

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Section: Calciumsupporting

confidence: 91%

Section: Magnesiumsupporting

confidence: 83%

Section: Magnesiummentioning

confidence: 99%

mentioning

confidence: 99%

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The effect of fertilizer nitrogen, phosphorus and potassium on the calcium, magnesium and phosphorus status of pasture cut for silage

Rodger

1982

J. Agric. Sci.

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“…All the cultivars can therefore meet the daily potassium requirements of beef and dairy cattle. The high potassium content of the cultivars IS not likely to cause any toxic effect since about 90 % of the potassium intake by cattle is usually excreted through the kidney (MuDD 1970).…”

Section: Potassiummentioning

confidence: 99%

Evaluation of the Forage Potentials of Pearl Millet in a Semi‐arid Tropical Environment

Makeri

Ugherughe

1992

J Agronomy Crop Science

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The pastures and rangelands of the semi‐arid region of Nigeria wherein is the bulk of the livestock in the country, provide sufficient nutrients for livestock for no more than three to five months of the year. There is therefore need to have high yielding and good quality forages to ensure adequate all‐year‐round forage supply for the livestock. The objective of this study was to evaluate the forage potentials of pearl millet (Pennistetum americanum [L.] K. Schum.) which is well adapted to the region. Twenty cultivars were evaluated for their growth, forage yield and mineral content potentials. The cultivars were significantly different in the number of leaves per plant, plant height, dry matter yield and potassium content in each cutting. Differences in crude protein and crude fibre contents were significant only between cuttings. Variations in crude protein and crude fibre contents ranged from 14.1 to 20.3 % and from 28 to 30.8 %, respectively. Cultivars had a progressive dimunition in growth, yield and mineral content potentials after the first or second cutting. Pearl millet therefore seems less suited to forage production in the semi‐arid region of Nigeria since no cultivar showed the potentials for adequate supply of all‐year‐round forage.

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The influence of fertiliser N plus K on N, S and other mineral elements in perennial ryegrass at a range of sites

1978

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Tn an agronomic experiment, perennial ryegrass was grown with four rates of fertiliser N + K at 21 sites in England and Wales. Herbage from two successive harvests at 14 of the sites has been examined for contents of N and S and of other mineral elements in relation to the nutrition of both the crop and ruminant animals. The highest rate of fertiliser application (125 kg N + 77.5 kg K/ha harvest) resulted in contents of total N greater than 4 % at five sites at the second harvest, but nitrate-N reached levels that might be toxic to livestock ( > 0.35 %) at only two sites. There was no evidence that supplies of S from soil and the atmosphere were inadequate for crop growth, or that the contents in the herbage were insufficient for ruminant animals, even though no S was supplied as feitiliser. On the contrary, in many samples, the content of S was so high as to constitute a potential hazard for ruminant animals through impairment of Cu availability. Values for the ratio total N : total S, which ranged from 3.2 to 15.6 : 1, generally increased with increasing rates of fertiliser. The concentrations of sulphate-S in the herbage were generally high and represented between 19 and 78 % of the total S. The content of Mg was only slightly affected by fertiliser N + K, but the ratio K : (Ca + Mg) increased markedly with increasing rates of fertiliser. At several sites the ratio exceeded 2.2 : 1, the value above which there is an increasing risk of hypomagnesaemia in ruminant animals. The sum of the concentrations of the cations C a + M g + K + N a in the herbage increased as the concentration of N increased, and there was a similar though less marked relationship between organic anions and total N in the herbage.

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The influence of heavily fertilized grass on mineral metabolism of dairy cows

Cited by 10 publications

References 16 publications

The effect of fertilizer nitrogen, phosphorus and potassium on the calcium, magnesium and phosphorus status of pasture cut for silage

The effect of fertilizer nitrogen, phosphorus and potassium on the calcium, magnesium and phosphorus status of pasture cut for silage

Evaluation of the Forage Potentials of Pearl Millet in a Semi‐arid Tropical Environment

The influence of fertiliser N plus K on N, S and other mineral elements in perennial ryegrass at a range of sites

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