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Update 4.1.2 N and TAN Excretions authored by Cora Vos's avatar Cora Vos
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4-Manure-management/4.1-Excretions/4.1.2-N-and-TAN-Excretions.md
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...@@ -108,19 +108,19 @@ The amount of N retained is calculated assuming an N content of the animal body ...@@ -108,19 +108,19 @@ The amount of N retained is calculated assuming an N content of the animal body
<span dir="">From the animal’s N balance the amount of nitrogen excreted can be assessed as follows:</span> <span dir="">From the animal’s N balance the amount of nitrogen excreted can be assessed as follows:</span>
![grafik](uploads/366c7a02615c5c5f33f11607a47dead2/grafik.png) ![grafik](uploads/a5e657d5fcc47df2e5dc2015acc18625/grafik.png)
<span dir="">The annual N intake of sows is a function of dry matter intake and N content of dry matter:</span> <span dir="">The annual N intake of sows is a function of dry matter intake and N content of dry matter:</span>
![grafik](uploads/40a8dde96be2f865fca4181d70eb90bf/grafik.png) ![grafik](uploads/d7b9388f3a087a57b9e713843bdb1ced/grafik.png)
<span dir="">The temporal variation during a production cycle of sows’ weight cannot be incorporated in the inventory. However, the mean net weight gain can be taken into account. According to </span>[<span dir="">GfE (2006)</span>](/9%20Literature#gfe-gesellschaft-f%C3%BCr-ern%C3%A4hrungsphysiologie-ausschuss-f%C3%BCr-bedarfsnormen-2006)<span dir="">, pg. 74, and </span>[<span dir="">DLG (2008b)</span>](/9%20Literature#dlg-deutsche-landwirtschaftsgesellschaft-2008b)<span dir="">, pgs 13 and 14, this can be estimated to be 35 kg per production cycle, a fact that has to be taken into account for the calculation of the N balance of the system sow-pigs.</span> <span dir="">The temporal variation during a production cycle of sows’ weight cannot be incorporated in the inventory. However, the mean net weight gain can be taken into account. According to </span>[<span dir="">GfE (2006)</span>](/9%20Literature#gfe-gesellschaft-f%C3%BCr-ern%C3%A4hrungsphysiologie-ausschuss-f%C3%BCr-bedarfsnormen-2006)<span dir="">, pg. 74, and </span>[<span dir="">DLG (2008b)</span>](/9%20Literature#dlg-deutsche-landwirtschaftsgesellschaft-2008b)<span dir="">, pgs 13 and 14, this can be estimated to be 35 kg per production cycle, a fact that has to be taken into account for the calculation of the N balance of the system sow-pigs.</span>
![grafik](uploads/ec0109f25ad3da05a9a6a244236c821b/grafik.png) ![grafik](uploads/4fa4a56752f4d87391baca3c39beb351/grafik.png)
<span dir="">The amount of N retained in the piglets between birth and weaning (_m_<sub>g, piglet</sub>) is derived from the weight of the conception products, the piglet weight gain between birth and weaning and the mean N content of pigs:</span> <span dir="">The amount of N retained in the piglets between birth and weaning (_m_<sub>g, piglet</sub>) is derived from the weight of the conception products, the piglet weight gain between birth and weaning and the mean N content of pigs:</span>
![grafik](uploads/afa919b4343cdd56c83b82fbbdef14cd/grafik.png) ![grafik](uploads/9b6f935e66249b0e8d56952e78d9570a/grafik.png)
<span dir="">The mass of conception products per piglet is the the overall mass of the conception products (25 kg per sow and litter, see </span>[<span dir="">DLG, 2008b</span>](/9%20Literature#dlg-deutsche-landwirtschaftsgesellschaft-2008b)<span dir="">, pg. 13) divided by the pertinent number of piglets (13 piglets per litter, see </span>[<span dir="">GfE, 2006</span>](/9%20Literature#gfe-gesellschaft-f%C3%BCr-ern%C3%A4hrungsphysiologie-ausschuss-f%C3%BCr-bedarfsnormen-2006)<span dir="">, pg. 74). The resulting mass of conception products per piglet is _a_<sub>cp</sub> = 1.923 kg per piglet.</span> <span dir="">The mass of conception products per piglet is the the overall mass of the conception products (25 kg per sow and litter, see </span>[<span dir="">DLG, 2008b</span>](/9%20Literature#dlg-deutsche-landwirtschaftsgesellschaft-2008b)<span dir="">, pg. 13) divided by the pertinent number of piglets (13 piglets per litter, see </span>[<span dir="">GfE, 2006</span>](/9%20Literature#gfe-gesellschaft-f%C3%BCr-ern%C3%A4hrungsphysiologie-ausschuss-f%C3%BCr-bedarfsnormen-2006)<span dir="">, pg. 74). The resulting mass of conception products per piglet is _a_<sub>cp</sub> = 1.923 kg per piglet.</span>
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