Feed conversions, ration compositions, and land use efficiencies of major livestock products in U.S. agricultural systems

Peters, Christian J.; Picardy, Jamie A.; Darrouzet-Nardi, Amelia; Griffin, Timothy S.

doi:10.1016/j.agsy.2014.06.005

Cited by 50 publications

(50 citation statements)

References 30 publications

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“…In addition to this variability in area of land required, the quality of land required differs as well. Modeling studies suggest that the largest fraction of land needs for ruminant animals are from forages and grazing lands (Wirsenius et al, 2010;Peters et al, 2014), which are often grown on non-arable land. Thus, reducing the most land-intensive products in the diet does not necessarily equate to freeing up land for cultivation.…”

Section: Assessing Impacts Of Diet On Land Use and Food Suppliesmentioning

confidence: 99%

“…The ovolacto-and lacto-vegetarian diets used about half of the cropland restricted to perennial forages, while the vegan diet used none of the restricted cropland. None of the vegetarian diets used any grazing land (dairy rations were modeled with cows fed only harvested feeds and forages, see Peters et al, 2014).…”

Section: Utilization Of Available Landmentioning

confidence: 99%

“…Biomass productivity of grazing lands is not reported in USDA yields statistics, and a separate procedure was used to estimate forage yields from grazed land (see Text S1, "Grazing yields" section and Table S1). The feed needs of livestock products (beef, chicken, dairy, eggs, pork, and turkey) were obtained from a model developed by Peters et al (2014) for the purpose of calculating feed conversion ratios and aggregate ration compositions based on contemporary production practices in the U.S. The model estimated feed needs for a simplified list of ingredients: alfalfa silage, corn grain, corn silage, grass hay, grazed forage, and soybean meal.…”

Section: Individual Foodsmentioning

confidence: 99%

See 2 more Smart Citations

Carrying capacity of U.S. agricultural land: Ten diet scenarios

Peters

Picardy

Darrouzet-Nardi

et al. 2016

Elementa: Science of the Anthropocene

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122

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Strategies for environmental sustainability and global food security must account for dietary change. Using a biophysical simulation model we calculated human carrying capacity under ten diet scenarios. The scenarios included two reference diets based on actual consumption and eight "Healthy Diet" scenarios that complied with nutritional recommendations but varied in the level of meat content. We considered the U.S. agricultural land base and accounted for losses, processing conversions, livestock feed needs, suitability of land for crops or grazing, and land productivity. Annual per capita land requirements ranged from 0.13 to 1.08 ha person -1 year -1 across the ten diet scenarios. Carrying capacity varied from 402 to 807 million persons; 1.3 to 2.6 times the 2010 U.S. population. Carrying capacity was generally higher for scenarios with less meat and highest for the lacto-vegetarian diet. However, the carrying capacity of the vegan diet was lower than two of the healthy omnivore diet scenarios. Sensitivity analysis showed that carrying capacity estimates were highly influenced by starting assumptions about the proportion of cropland available for cultivated cropping. Population level dietary change can contribute substantially to meeting future food needs, though ongoing agricultural research and sustainable management practices are still needed to assure sufficient production levels.

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Section: Assessing Impacts Of Diet On Land Use and Food Suppliesmentioning

confidence: 99%

Section: Utilization Of Available Landmentioning

confidence: 99%

Section: Individual Foodsmentioning

confidence: 99%

See 1 more Smart Citation

Carrying capacity of U.S. agricultural land: Ten diet scenarios

Peters

Picardy

Darrouzet-Nardi

et al. 2016

Elementa: Science of the Anthropocene

Self Cite

122

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“…This is directly analogous to the RSR for food (i.e., RSR FOOD ) described above, and the supply side of the estimation is largely contained in Griffin et al (2015). Conrad et al (2017) extended this approach by estimating regional livestock feed demand for major livestock categories (beef, dairy, swine, poultry including eggs) using the model of Peters, Picardy, DarrouzetNardi, and Griffin (2014). This model uses maize and soy as the primary feed components to supply energy and protein, respectively, for all livestock categories.…”

Section: Study 2 Baseline: Rsr For Food (Rsrfeed)mentioning

confidence: 99%

Baselines, Trajectories, and Scenarios: Exploring Agricultural Production in the Northeast U.S.

Griffin

Peters

Fleisher

et al. 2018

J. Agric. Food Syst. Community Dev.

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“…However, this fact may not restrain the direct application of the fermented material with the enzymes in feed. Rations are generally composed of the most commonly available feed ingredients in alfalfa, corn (grain and silage), grass hay, soybean meal, and pasture (Peters et al 2014). The mixture of the fermented substrate, soybean husks, containing xylanases and other produced hemicellulolytic enzymes, with ration components can be a good alternative for their employment for animal feed.…”

Section: Xylanase Production By Solid State Fermentationmentioning

confidence: 99%

Characterization of Hemicellulolytic Enzymes Produced by Aspergillus niger NRRL 328 under Solid State Fermentation on Soybean Husks

Montibeller¹,

Vandenberghe²,

Amore³

et al. 2014

BioResources

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This manuscript describes the analysis of xylanase production by Aspergillus niger NRRL 328 in solid state fermentation (SSF) of soybean husks. A maximum value of extracellular xylanase activity of approximately 950 U g -1 was achieved after 96 h. Proteomic analyses performed on the enzymatic mixture responsible for the maximum value of xylanase activity in SSF revealed the presence of two xylanases. This xylanolytic mixture was partially purified and characterized. It followed Michaelis-Menten kinetics towards xylan, with a KM of 7.92 ±0.97 mg xylan/mL and a Vmax of 262.2 ± 27.8 g L -1 s -1 . The optimum pH for the enzyme is 5.3, and the optimal temperature is 50 °C. The enzyme retains 100% of its activity at 40 °C for at least 1 month. It shows very high stability in a broad pH range, with a half-life of 40 days at pH 5.3, pH 6.0, pH 6.5, pH 7.0, and pH 8.0.

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Feed conversions, ration compositions, and land use efficiencies of major livestock products in U.S. agricultural systems

Cited by 50 publications

References 30 publications

Carrying capacity of U.S. agricultural land: Ten diet scenarios

Carrying capacity of U.S. agricultural land: Ten diet scenarios

Baselines, Trajectories, and Scenarios: Exploring Agricultural Production in the Northeast U.S.

Characterization of Hemicellulolytic Enzymes Produced by Aspergillus niger NRRL 328 under Solid State Fermentation on Soybean Husks

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