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aerated lagoons aeration Agric Agricultural Engineering Department Agricultural Research Agricultural Research Council air temperature ammonia animal waste average battery cages bedding beef cattle behaviour bibl birds broilers cages calves Canada centre CIGR climatic cubicles Current projects daily gain dairy cattle degC developed effect environment environmental equipment evaluation Farm Building Research farrowing fattening feed conversion feed conversion ratios feed efficiency feedlot grain groups heat loss humidity Institute of Agricultural insulated investigated issue KTBL lagoon litter livestock livestock buildings loosehousing manure ment moisture mud pen odour oxidation ditches parlours performance pig houses piggeries piglets pigs planning potatoes Previous report problems Research Institute rural Saskatchewan Section shelter silage silos slatted floor slurry sows stalls storage stored structural study days tanks tests tion trials units Univ UNIVERSITY AGRICULTURAL ENGINEERING ventilation Vollebekk Wageningen weight gains wind winter