AGR 2050 Lecture Notes - Lecture 20: Ogallala Aquifer, Biofilter, Aquifer

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Friday, March 2, 2018
Water Use/Cycling & Crop Production for
Animal Production Systems
Nutrient Flow in the Livestock Sector
Agricultural Greenhouse Gasses Sources
Climate Change Impacts
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Main Impacts
o Feed production
Fertilizer production
Field operations
o Manure management
Methane emissions
Nitrous oxide emissions
Carbon Age
It matters!
Is 1kg of CO2 from diesel the same as 1 kg CO2 from forages
o One is 1 year old carbon, the other is millions
Nutrient Requirements of Small Ruminants
Sheep
Goats
Cervids
New world camelids
FEED NUTRIEND INTAKE
NUTRIENTS RETAINED BY ANIMALS
OR ANIMAL PRODUCTS
NUTRIENT EXCRETION
The trend in all livestock species has been to reduce N & P output so reductions in CP
& P recommendation should not be a surprise
Phosphorus (P) in Livestock Nutrition
Essential Nutrient
o Growth, energy metabolism, cell structure
o Diets are supplemented with inorganic P
Economic Impact
o 3rd most expensive nutrient in swine diets
Environmental impact
o Excretion with manure/Eutrophication
Phosphorus losses
o Less than 35% of feed P is exported from the farm as animal products (milk &
meat)
o P consumed is the major factor influencing amount of P excreted
o Most P excreted is in feces
Phosphorus reduction/monogastrics
o Much of P is stored in cereal grains in a molecule called phytate
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o Monogastrics are unable to utilize phytate P because they lack the enzyme
phytase
o The total P & phytate P content varies between & within feedstuffs
o Availability varies between 15 & 60%
Nitrogen (CP) Reduction
Nitrogen in manure in influenced by the amount of undigested protein & excess
dietary nitrogen
Optimizing AA supply leads to better animal performance & reduces over supply of
AAs that increase nitrogen excretion ‘Bypass
Meet but do not exceed protein (CP) requirements
Rumen Chemistry
Ruminant dietary CP availability
The Bottom Line
There are nutritional strategies to reduce N & P excretion
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