The studies of nitrogen emission under different pig housing, care and manure handling technologies
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CONTRIBUTORS:
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PROCEEDINGS TITLE:
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YEAR:
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2002
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PUB TYPE:
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Conference Paper in Proceedings
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PAGES:
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139 -
146
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SUBJECT(S):
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pigs, nitrogen emission, pig housing, manure handling, conversion of nutrients
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DISCIPLINE:
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Agricultural and Food Sciences
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-442-693
(Last edited on
2008/05/20 07:28:45 GMT-6)
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SPONSOR(S):
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ABSTRACT:
The studies were conducted at the Lithuanian Institute of Animal Science to determine the balance of nutrients N, P and K, their conversion to livestock production and retention in manure as well as losses under different pig housing and feeding, manure handling technologies. The temperature, relative humidity, ammonia, carbon dioxide content of indoor and outdoor air were measured in pigsties. The measurements were performed all the year round, that has enabled to compare some indoor climate parameters and nitrogen emission in dependence upon different pig housing conditions.
The analysis of conversion of feed nutrients into production indicated that fattening pigs, when kept on partially slatted floor in barns, absorbed from the feeds 22.9 % of nitrogen, 29.2% of phosphorus and 4.1% of potassium for meat production. Conversion coefficients for nitrogen, phosphorus and potassium into live weight gain of weaners till 4 months of age where respectively 23.0-33.6 %, 37.5-42.8 % and 10.3-15.4%. The average conversion coefficients of nutrients into live weight gain and fetus of gestation sows were 14.6 % of nitrogen, of lactating sows with piglets - 34.8 % of nitrogen.
The highest nitrogen emission was determined in warm barns with high amount of litter. Low nitrogen emission factor of 7.6±2.3 % was determined in weaner barns with housing on partially slatted floor, while in warm loose weaner barns on semideep litter the same factor was 14.5±2.4 %, in lactating sow houses, with limited amount of littering -9.3±3.5 % and in gestating sow houses on semideep litter - 14.0±3.5 %.
Highest nitrogen emission from pigsties was determined in warm fattening pig barns where animals were hold on partially slatted floor. Nitrogen emission was then 21.9±6.90%.
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