Phosphorus requirement of finishing feedlot calves

Erickson, Galen E.; Klopfenstein, Terry J.; Milton, Charles; Brink, Dennis R.; Orth, Michael; Whittet, Kimberly M.

doi:10.2527/2002.8061690x

Cited by 40 publications

(26 citation statements)

References 14 publications

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“…Calves were fed 0.16, 0.22, 0.28, 0.34, or 0.40% P. Phosphorus intake ranged from 14 to 36 g/d, or 76 to 190% of NRC recommendations for these animals. Performance and bone mineral content were unaffected by P intake (Erickson et al, 2002). However, plasma inorganic P did respond quadratically with the lowest concentrations observed in steers fed 0.16% P. Feed efficiency was not related to P intake ( Figure 3).…”

Section: Feedlot Beefmentioning

confidence: 80%

The role of nutrition in reducing nutrient output from ruminants

Satter

Klopfenstein

Erickson

2002

Journal of Animal Science

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Much of the effort expended on nutrient management has focused on the post-excretion product. It is important to keep in mind that management of the diet can have important impacts on quantitative and qualitative aspects of the excreted nutrients. Surveys of nutritionists and extension specialists show that dairy producers are advised to feed 0.45 to 0.50% phosphorus (P) (DM basis) in their lactating cow diets. This is 20% in excess of NRC (2001) requirements. Feeding to requirement would reduce P excretion by 25 to 30% and would reduce solubility and potential for runoff of the P that is applied to fields. Nitrogen (N) excretion by dairy cows can also be decreased, but by a lesser amount. Balancing ruminally undegraded and degraded protein and use of protected methionine along with strategic selection of protein supplements that are relatively rich in lysine, may permit a 10 to 15% reduction in total N excretion, with most of the reduction occurring in urinary N. Urinary urea, following conversion to ammonia, is the N excretion product most vulnerable for loss to the environment. Feedlot cattle rou-

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Section: Feedlot Beefmentioning

confidence: 80%

The role of nutrition in reducing nutrient output from ruminants

Satter

Klopfenstein

Erickson

2002

Journal of Animal Science

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“…A second experiment was conducted (Erickson et al, 2002) with calves of 265 kg initial weight. The control diet contained 0.16% P and graded levels of P were added as monosodium phosphate.…”

Section: Phosphorusmentioning

confidence: 99%

Effects of manipulating protein and phosphorus nutrition of feedlot cattle on nutrient management and the environment

Klopfenstein

Erickson

2002

Journal of Animal Science

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Feedlot nutrition will play a role in meeting challenges such as nutrient management. Nitrogen and phosphorus are two nutrients that are currently studied in this context. One nutritional method is formulating diets not to exceed requirements for nitrogen and phosphorus. Requirements are different for calves and yearlings. The requirements also change during the finishing period. Phosphorus requirements have not been extensively studied for feedlot cattle between 270 and 600 kg. Therefore, P requirements studies were conducted to determine the P requirement of calves (265 kg) and yearlings (385 kg). The requirement was not detected with P levels as low as 0.14 (yearlings) and 0.16% (calves) of diet DM based on performance and bone ash. Compared to NRC-predicted P requirements, P intakes ranged from 76 to 190% (calves) and 71 to 162% (yearlings). In separate nutrient balance experiments, decreasing dietary P to NRC-predicted requirements (0.22 to 0.28%) did not influence gain but decreased P input by 33 to 45% and excretion by 40 to

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“…Erickson et al (2002) found values of 8.0 mg dL -1 with different levels of P in the diet (0.22%, 0.28%, and 0.24%) for feedlot steers, but levels changed significantly over time. The increased blood Mg for OD (p = 0.0564) could be attributed to the much larger content of Mg in oats (0.42%) than in corn (0.11%) as reported by NRC (1996).…”

Section: Blood Profile and Rumen Parametersmentioning

confidence: 89%

Performance and ultrasound measurements of beef cattle fed diets based on whole corn or oats grains

Arelovich

Bravo

Martínez

et al. 2013

Chilean J. Agric. Res.

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This study intended to contrast dietary effects of whole grain oats versus corn included in rations with moderate roughage content on animal performance, beef ultrasound measurements, rumen and blood parameters. Ten Aberdeen Angus steers (203 kg) in individual pens were fed twice daily on either whole oats (OD) or corn (CD) based diets. Measurements were: DM intake (DMI), average daily gain (ADG), feed to gain ratio (F/G); back fat (BF) and rib eye area (RA); blood parameters. Four cannulated steers were used to study rumen pH, NH3-N and grain degradability. Rations dietary components were 55% grain, 30.1% barley straw, and 10.6% whole soybeans. Despite calculated higher ME supply (P = 0.0887) no differences were found for DMI, ADG, or F/G. Metabolizable protein intake (19.4%) was larger and degradable protein intake (43.3%) smaller for CD compared with OD (P < 0.01). The growth rate (cm 2 d -1) for RA was 40% grater for OD, but larger BF deposition (P = 0.0787) was found for CD. Blood Mg was higher for OD (p = 0.0564), nevertheless other blood parameters remained unaffected. Rumen pH and NH3-N were not influenced by diet, variations were only observed within time periods. Rumen pH decreased linearly from 7.05 to 6.13 and 7.11 to 6.37 for OD and CD respectively (P < 0.05). Minimum NH3-N concentrations (mg dL -1 ) were reached 12 and 18 h after morning meal for OD (7.10) and CD (5.82) respectively. Rumen degradation was larger for oats than corn. Whole oats rather than corn fed up to 55% of total DM seems to improve protein deposition, without significant changes in animal performance, rumen environment or blood parameters.

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Phosphorus requirement of finishing feedlot calves

Cited by 40 publications

References 14 publications

The role of nutrition in reducing nutrient output from ruminants

The role of nutrition in reducing nutrient output from ruminants

Effects of manipulating protein and phosphorus nutrition of feedlot cattle on nutrient management and the environment

Performance and ultrasound measurements of beef cattle fed diets based on whole corn or oats grains

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