Influence of Long-Term Feeding of Limited Amounts of Phosphorus on Dry Matter Intake, Milk Production, and Body Weight of Dairy Cows

Valk, H.; Šebek, L.B.J.

doi:10.3168/jds.s0022-0302(99)75459-7

Cited by 84 publications

(80 citation statements)

References 6 publications

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“…In other words, the question of phosphorus requirements for the rumen ecosystem is raised, owing to the role of phosphorus especially in cell wall degradation [54]. Accordingly, considerations on phosphorus nutrition of ruminants should include a specific, microbial phosphorus compartment that interferes with phosphorus utilisation by the host animal, especially if a decrease in the phosphorus supply is investigated [66] and if the diet fed induces lower salivary phosphorus fluxes.…”

Section: Phosphorus Supply To the Rumen Ecosystemmentioning

confidence: 99%

II. Quantitative aspects of phosphorus absorptionin ruminants

Bravo

Sauvant

Bogaert³

et al. 2003

Reprod. Nutr. Dev.

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-Phosphorus absorption in ruminants was analysed from a database described in a previous article. For common values of ingested phosphorus (2.5-5.0 g·kg -1 of DM), 0.73 of dietary phosphorus is absorbed. The remaining variability is probably due to phosphorus quality. Phosphorus absorbed from silage, cereal, cereal by-products and hay differs greatly. The current true absorption coefficient used to calculate daily phosphorus supply is a constant value in the current systems and often it underestimates the true absorption resulting in an excess of phosphorus being supplied in the diets. Adjusting the true absorption coefficient values requires better characterisation of the phosphorus supplied by each feedstuff. Dietary influences (phytate phosphorus, crude fibre, etc.) were investigated but trials assessing the ration effect on phosphorus absorption are lacking. Since rumen microbes have specific phosphorus requirements, particularly for cell-wall degradation, the feedstuff phosphorus availability for the rumen ecosystem is discussed.absorption / availability / phosphorus / quantitative aspect

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Section: Phosphorus Supply To the Rumen Ecosystemmentioning

confidence: 99%

II. Quantitative aspects of phosphorus absorptionin ruminants

Bravo

Sauvant

Bogaert³

et al. 2003

Reprod. Nutr. Dev.

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“…In the next 10-20 years decreases of herbage yield might be foreseen, due to the conversion of available soil P into soil P fractions that are less available to plants (Power et al 2005). In the end, the P content in herbage may decrease to a level that is insufficient to meet the P requirements of lactating and high-yielding dairy cattle (Valk and Sebek 1999). This insufficiency may be addressed by supplementing P via manufactured feed or by accepting a decrease in the production of milk and meat per unit surface area.…”

Section: Introductionmentioning

confidence: 99%

Does balanced phosphorus fertilisation sustain high herbage yields and phosphorus contents in alternately grazed and mown pastures?

Middelkoop

Salm

Ehlert

et al. 2016

Nutr Cycl Agroecosyst

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Many soils of agricultural land in affluent countries have been enriched with phosphorus (P), because P application via fertilisers and manures was larger than P withdrawal via harvested biomass. This practice threatens the long-term availability of P fertilisers derived from finite rock phosphates, as well as surface water quality because of P leaching and runoff losses. In response, restrictions on P fertilisation have been implemented in some countries. The objective of this study is to examine the effects of balanced P fertilisation in comparison to a surplus P fertilisation on dry matter (DM) grass yield, grass quality, and soil P status. A 15 years' lasting field experiment was conducted on four permanent grassland sites, on sand (two sites), peat and young marine clay in the Netherlands. Fertilisation levels, including cattle slurry, were aimed to implement P surpluses of 0, 9, and 18 kg P ha -1 year -1 , and N surpluses of 180 and 300 kg ha -1 year -1 . Grasslands were alternately grazed and mown, and grass yields and soil P levels were measured. Annual DM yield, P content, and P yield of grazed grassland were lower at balanced P fertilisation than at a surplus of 9 or 18 kg P ha -1 -year -1 on sand and peat. Differences between P treatments remained constant over time. On the recently reclaimed marine clay, DM yield did not differ between P treatments, but P content and P yield did respond to different P surpluses. Differences between sites in the response to P surpluses were related to differences in soil P status, according to P-AL (capacity indicator) and P-CaCl 2 (intensity indicator). At balanced P fertilisation, P-AL tended to decrease, while P-CaCl 2 tended to remain constant. At surplus P, P-AL tended to increase and P-CaCl 2 tended to remain constant. Herbage yield and P uptake also strongly responded to N treatments. In conclusion, there is a risk that balanced P fertilisation reduces herbage yield and P content relative to surplus P fertilisation, even at relatively high soil P status. The risk of yield reduction seems to be related to the ratio between the P intensity indicator and P capacity indicator.Electronic supplementary material The online version of this article

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“…Considering the DMI and milk output (7000 l/[lactation·cow]) in the present study, this value is lower than suggested by our work. This could be due to the higher energy concentration of the feed given by Valk and Šebek (1999), which might have increased the efficiency of P utilization. It may also be the case that the availability of about 70 g P/day is the upper limit above which cows do not utilize more P regardless of milk output.…”

Section: Discussionmentioning

confidence: 99%

“…Although the overall efficiency of P utilization for milk production was still low, it was improved substantially in Experiment 2. Valk and Šebek (1999) reported that 2.8 g P/kg DM was adequate for highyielding dairy cows (9000 l/[lactation·cow]), supplying 68 g P/day in early-mid lactation. Considering the DMI and milk output (7000 l/[lactation·cow]) in the present study, this value is lower than suggested by our work.…”

Section: Discussionmentioning

confidence: 99%

Effect of energy and protein supplementation on phosphorus utilization in lactating dairy cows

Kebreab¹,

France²,

Sutton³

et al. 2005

J. Anim. Feed Sci.

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Two experiments were undertaken in which grass silage was used in conjunction with a series of different concentrate types designed to examine the effect of carbohydrate source, protein level and degradability on total dietary phosphorus (P) utilization with emphasis on P pollution. Twelve Holstein-Friesian dairy cows in early to mid-lactation were used in an incomplete changeover design with four periods consisting of 4 weeks each. Phosphorus intake ranged from 54 to 80 g/day and faecal P represented the principal route by which ingested P was disposed of by cows, with insignificant amounts being voided in urine. A positive linear relationship between faecal P and P intake was established. In Experiment 1, P utilization was affected by dietary carbohydrate type, with an associated output of 3.3 g faecal P/g milk P produced for all treatments except those utilizing low degradable starch and low protein supplements, where a mean value of 2.8 g faecal P/g milk P was observed. In Experiment 2, where two protein levels and three protein degradabilities were examined, the efficiency of P utilization for milk P production was not affected by either level or degradability of crude protein (CP) but a significant reduction in faecal P excretion due to lower protein and P intake was observed. In general, P utilization in Experiment 2 was substantially improved compared to the Experiment 1, with an associated output of 1.8 g faecal P/g milk P produced. The improved utilization of P in Experiment 2 could be due to lower P content of the diets offered and higher dry matter (DM) intake. For dairy cows weighing 600 kg, consuming 17-18 kg DM/day and producing about 25 kg milk, P excretion in faeces and hence P pollution to the environment might be minimized without compromising lactational performance by formulating diets to supply about 68 g P/day, which is close to recent published recommended requirements for P.

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Influence of Long-Term Feeding of Limited Amounts of Phosphorus on Dry Matter Intake, Milk Production, and Body Weight of Dairy Cows

Cited by 84 publications

References 6 publications

II. Quantitative aspects of phosphorus absorptionin ruminants

II. Quantitative aspects of phosphorus absorptionin ruminants

Does balanced phosphorus fertilisation sustain high herbage yields and phosphorus contents in alternately grazed and mown pastures?

Effect of energy and protein supplementation on phosphorus utilization in lactating dairy cows

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