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Industry Partners
Prairie Swine Centre is an affiliate of the University of Saskatchewan
Prairie Swine Centre is grateful for the assistance of the George Morris Centre in developing the economics portion of Pork Insight.
Financial support for the Enterprise Model Project and Pork Insight has been provided by:
Respiratory health of swine producers. Focus on young workers
Posted in: Welfare by admin on January 1, 1993 | No Comments
Microbial Processes in Deep-litter Systems for Fattening Pigs and Emission of Ammonia, Nitrous Oxide and Nitric Oxide.
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The total nitrogen emissions as NH3, NO and N2O were greater for both deep litter systems compared to traditional. Optimum condition are difficult to obtain (moisture, oxygen transfer, bed temperature, microbial activity).
A Model to Describe the Effect of Nutrition on Growth, Body Composition and Nitrogen Excretion in Pigs
Posted in: Environment by admin on | No Comments
All the different relations used to build the model are presented. However no results simulation results are presented to compare with what happen in real situations.
Nutrient Balances in Calcareous Soils After Application of Different Rates of Pig Slurry
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This experiment was made in small pots and for a short period of time, conditions that are not quite comparable to real, in the field, conditions where changes can occur in the soil profile. For manure applied at a rate of 100 m3/ha around 365 kg N/ha and 60 kg P/ha and 455 kg N/ha and 65 kg P/ha are than applied to the soil.
The Influence of Various Pig Housing Systems and Dietary Protein Levels on the Amount of Ammonia Emissions in the Case of Fattening Pigs.
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5 pig houses were chosen for a total of 2600 pigs from 25 to 115kg liveweight. Ammonia emissions are collected and trapped for each day separately. The results show that for the buildings were the ventilation extracted the air from under the slatted floor, the difference between the treatments were not significant as the air movement was higher close to the manure. Differences obtained between farms are difficult to explain on the base of the design as emissions vary within the same type of floor, partly slatted, for different sir supply technique. In some cases the ambient temperature had probably an effect on the emissions. Significant differences come from the treatments with lower ammonia emission obtained with the treatment B (lower CP diet) the results being for the lower 10,0 g NH4-N/pig-day for A and 8 for B in same farm (ventilation and systems identical, partly slatted and above floor ventilation with air supplies coming from doors) and the highest being 22 g NH4-N/pig-day for A and 12 for B with in a building fully slatted with the Optimavent fresh air intake system.
No statistical analysis was done on the housing systems so it is difficult to know if the differences are significant or not. And no explanation for the variation between the different building systems is done. No enough information is given to explain those variations. Further, no information is given on ventilation rates which can have an effect on ammonia emissions as high ventilation rates will result in higher air movement and higher emissions.
Development of an Industrial Process Technology for the Manufacturing of Lysine from Pig Manure
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Laboratory and small scale experiments showed that about 75% of the nitrogen present in the manure can be converted to lysine. Mineral excesses have to be extracted to complete the treatment process. Those processes are presented but not many results are shown and no information is given on the investment and operation cost.
Optimisation of the Feeding Strategy to Minimize the N-excretion by Using the Dutch Technical Pig Feeding Model
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The model developed predict the influences of many parameters on pig growth for the growing and fattening periods. The impact of the feed composition can be simulated on N and P excretion. The simulation results showed that for the growing-finishing period, the multi-phase feeding system ( a mix of 16% and 13% crude protein diets adjusted every week to satisfy the pigs’ requirements according to their growth stage) could reduce the N excretion by 15% compared to the two-phase feeding system (one feed for the growing period and another for the fattening period).
Effets du lisier de porc sur la charge d'azote et de phosphore dans l'eau de ruissellement sous des pluies simulees
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As the experiments were done in laboratory, the results have to be considered with caution. The real values obtained may not be applicable for fields situations however the general behavior is likely to be the same. Manure injection reduce the phosphorus and nitrogen load in the runoff at the same level than with no manure application. However when the manure is applied on the soil surface, the nutrients load in the runoff increase with the application rate and is higher when the rain occurs soon after spreading. Also the longer the rain will be the losses of ammoniacal -N will than be more important as the contact time of the water and the manure is longer. In order to reduce the nutrient losses particularly for the nitrogen, the application rates should be as low as possible and the spreading should be done at least 1 day before a rain and manure should also be injected or incorporated.