X
XLinkedinWhatsAppTelegramTelegram
0

Reduction of greenhouse gas emission from swine manure by using a low-protein diet with synthetic amino acids

Under ad libitum feeding, a low crude protein amino acid supplemented diet can reduce N excretion in manure with no impact on animal growth.

28 October 2011
X
XLinkedinWhatsAppTelegramTelegram
0

Although effects of dietary protein reduction on N excretion are well documented, the potential of protein reduction to decrease N2O and CH4 emissions has not been widely examined. We completed N balance experiments in growing swine to assess effects of a low protein diet supplemented with amino acids on N retention. Feces and urine obtained were used to evaluate greenhouse gas (GHG) emissions from composting and wastewater treatment processes. Five crossbred barrows of 38 kg were used. The crude protein (CP) contents in the control (CONT) and low CP (LOW) diets were 171 g/kg and 145 g/kg (as fed), respectively. The low CP diet was supplemented with lysine, threonine, methionine and tryptophan at levels sufficient to meet their requirements. Manure from swine fed the control or low CP diet was placed in an experimental composting apparatus with forced aeration, and GHG emissions were measured during a 5 wk composting period. Two bench scale activated sludge units were used for wastewater treatment. Under a hydraulic retention time of 5 d and biochemical oxygen demand loading rate of 0.4 kg m3/d, both sets of wastewater experiments were for 6 wks.

There were no differences in daily barrow weight gain and N retention between CONT and LOW (P > 0.05). However, urinary N excretion of 5.5 g/kg dry matter (DM) intake and total N excretion of 10.1 g/kg DM intake were lower in the LOW group than in CONT (P < 0.05). The amount of N excreted in feces and urine was reduced by 28.7% in the LOW group. The reduction in manure GHG emissions was even higher, with a 39.1% reduction in the LOW group, although there was no change in emission factors as CH4/VS or N2O/N, compared with manure from CONT. About 0.5% of the influent N was emitted as N2O from compost and about 1.8% as N2O from wastewater. Compared with total emissions, six times more N2O was emitted through wastewater treatment than from composting.

T Osada, R Takada and I Shinzato, 2011. Animal Feed Science and Technology, 166? 167: 562? 574.

Article Comments

This area is not intended to be a place to consult authors about their articles, but rather a place for open discussion among pig333.com users.
Leave a new Comment

Access restricted to 333 users. In order to post a comment you must be logged in.

You are not subscribed to this list Swine News

Swine industry news in your email

Log in and sign up on the list

Related articles

European Union - New European research project on greenhouse gas balance in agriculture and forestry

08-Feb-2010
On 27 January a new large European project on greenhouse gas balance in agriculture and forestry was launched. The ambitious aim of this project is to establish a greenhouse gas budget for Europe, including the order of magnitudes of various greenhouse gas sources and sinks, their regional distribution, and their temporal dynamics. The project tries to separate human-related factors like land use from natural factors like weather and climatic variability. When we understand the processes better, we can make better suggestions as to what we need to do in agriculture and forestry to keep their effect on the climate balance positive.
You are not subscribed to this list Swine News

Swine industry news in your email

Log in and sign up on the list