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House-Level Moisture Production of Modern Swine by Age, Temperature and Source

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131618005,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: 10.13031/aim.20131618005) @2014
Authors:   Morgan D Hayes, Tami M Brown-Brandl, John P Stinn, Hong Li, Hongwei Xin, John A Nienaber, Timothy A Shepherd
Keywords:   latent heat, moisture production, swine, house-level moisture, relative humidity.

Abstract. Minimum ventilation in swine housing is often used to control relative humidity in a barn. Thus, realistic data on latent heat or moisture production (MP) are critical to correctly determine the minimum ventilation needs. As part of a study to update heat production rates for modern swine genetics, latent heat production or MP has been calculated for various scenarios. The objective of this paper is to delineate MP by age of pigs, barn temperature and source which includes a) respiration of the pigs, b) evaporation of water from the manure pit and leaks in the waterers, c) combustion of fuel for supplemental heat of the barn, and d) evaporation of water from sprinklers systems. This will be obtained using MP data for pigs housed in indirect calorimetry chambers where moisture production sources other than the pig’s respiration are minimized, analyzing MP data for a full-scale empty barn with varying sprinkler usage or heater usage to determine MP unrelated to the pigs, and partitioning the whole-house MP according to the above sources for pigs of various ages and at different barn temperatures.

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