Contract Hog Production and Environmental Management in the Southern United States

Posted in: Environment by admin on January 1, 1999 | No Comments

Development of a Treatment Technology using Lime, Lime-clay Combination and Plant Derived Phyto chemicals for Eliminating Odour from Hog Operations

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Many products currently on the market are designed to mask the odour or deodorize the air rather than affect the actual production. This study describes a technology which acts on the root cause of these odours a

Heavy metal contents of livestock feeds and animal manures in England and Wales

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The Role of Sask Pork Chair in Environmental Engineering

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Behaviour of stabled horses provided continuous or intermittent access to drinking water.

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Controlled atmosphere stunning of poultry.

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Alternative housing for sows and litters: 2. Effects of a communal piglet area on pre- and post-weaning behaviour and performance.

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The focus of this study was to determine the effects that a communal piglet area had on pre- and post-weaning behaviour and performance of piglets. Three litters were combined to from a cohort, with 10 experimental and 10 control cohorts examined. In the experimental treatment, two central crates were left empty and became the communal area, which consisted of six creep feeders, a covered area, and PVC pipe and cotton rope for enrichment. The controls left the two central crates empty, but the litters remained isolated from one another. The piglets were allowed access to the communal area from11 days of age until they were weaned at 28 days of age. At weaning, the cohorts either remained unmixed or three piglets were mixed with another three piglets from different cohort. Throughout the study, piglets and feeders were weighed, as well as, video recordings were taken to document various behaviours before and after weaning. Experimental pigs, when compared to the controls, spent considerably more time away from the sow, which resulted in a reduced nursing frequency. This reduction did not coincide with a significant increase in creep feed intake, however the experimental piglets ate 86% more creep feed than control piglets. There was not a difference in weight gain between experimental or control piglets prior to weaning. Aggression was minimal when the piglets were allowed access to the communal area, as well; cross-suckling aggression from the sows was also rare. A reduced amount of aggression was also seen weaning. After weaning, the experimental piglets ate more and tended to gain more weight than the control piglets. Piglets that were mixed at weaning ate less feed and had lower weight gains than cohorts that remained intact.

Mass Transfer Coefficient of Ammonia in Liquid Swine Manure and Aqueous Solutions

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The Use of Ozone to reduce the Concentration of Malodorous Metabolites in Swine Manure Slurry

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Effect of Anaerobic Digestion on Struvite Production for Nutrient Removal from Swine Waste Prior to Land Application

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Cases exist where relatively intense livestock production exists in areas with limited arabll land: Denmark, Netherlands and North Carolina. Over time repeated manure application can result in an accumulation of phosphorus in mnaure applied soils. Most nutrient management plans are formulated on Nitrogen, preventing leaching of nitrogen from the soil. If nutrient management plans were based on phosphorus application rates land requirements would increase 4 to 8 times. Alternative solution exist to reduce the phosphorus content of manure. One of these is forced precipitation of struvite for phoisphorus removal. “Using raw swine manure, testing has demonstrated that up to 92% of reactive phosphorus can be removed by th addition of Mg2+ to the waste in the form MgO and by heating to 35 degrees Celcius to force formation of struvite. Up to 98% of the reactive phosphorus can be removed by the same procedure with anaerobially digested swine manure.” However a 95% reduction in reactive phosphorus can be achieved for half of the chemical cost.