Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A balanced protein diet can reduce accumulation of nitrogen on dairy cattle farms by up to 35%

08.06.2010
Improving the nutrition of dairy cattle is a key instrument for reducing the environmental problems caused by the accumulation of nitrogen on dairy farms.

Research conducted in the Basque Institute for Agricultural Development and Research, Neiker-Tecnalia, and led by the biologist Haritz Arriaga in collaboration with the Universitat Autònoma in Barcelona, has demonstrated that up to 35% of the accumulated nitrogen on dairy farms in the Basque Country can be reduced with a balanced diet in protein content without reducing milk production.

The first part of the research was conducted in 64 commercial farms in the Basque Country, in which it was shown that on most of these (70%) the diet of the lactating cows was excessively rich in proteins. The quantity of protein ingested is directly related to the faecal and urinary excretion of N (R2 = 0.7), because 6.25% of the protein is formed by this chemical element. Thus, the greater the ingestion of protein the greater nitrogen losses into the environment, despite the milk production is also higher. So, the purpose of farmers’ should be an adjustment of protein consumption to the nutritional needs of the cattle without reducing the production and quality of milk. In this sense, results demonstrated that up to 35% of the accumulated nitrogen on dairy farms in the Basque Country can be reduced with a balanced diet of proteins.

The results also demonstrated that nutritional strategies can reduce the accumulation of nitrogen on high-density dairy farms. The concentration of this chemical element per hectare of available soil can be reduced by 11.2% through the optimisation of protein content in rations.

Feed for reducing nitrogen
In the second study, the research group of Neiker-Tecnalia analysed the efficient use of nitrogen in the animal through a greater use of commercial concentrates and, thereby, the energy content of the diet. Afterwards, they studied the excretion of N and its concentration in the resulting manure. In this study a comparison was made of diets with low forage content and high concentrate content (ratio 45:55), usually employed on intensified dairy farms, with diets involving greater forage content and less concentrate content (ratio 75:25), considered less energetic but more sustainable from an environmental and feeding perspective. The resulting manures from the different diets were subsequently applied on a grassland in order to evaluate the volatilisation of the nitrogen-based gases, ammonia (NH3) involved in the acidification and eutrofisation of aquatic and edaphic ecosystems as well as nitrous oxide (N2O) and nitric oxide (NO), involved in the greenhouse effect and destruction of the ozone layer.

The researchers demonstrated that rations with higher forage content reduce the voluntary ingestion of food, because the animal is satisfied because of the fibre content of the forage. As a consequence, the nitrogen intake in this diet is also reduced and, consequently, the excretion is lower, which contributes to minimise the ammoniacal nitrogen (N-NH4+) in the resulting manure. However, this reduction in the ingestion of food and nitrogen also causes a loss in milk production.

The alteration of the nitrogen composition of the manure (N-NH4+) can have environmental implications depending on the handling carried out by the farmer in the fields. Emissions of nitrogen gases (ammonia, nitrous oxide and nitric oxide) to the atmosphere after applying manures obtained with high or low forage content diets are similar when the same N-NH4+ doses are applied on-field. After applying 120 kg N-NH4+, nitrogen gas emissions were 18.7 kg N per hectare in the case of diets with high content of forage (14,8%), while in the case of diets with low forage content, 11.5 kg of N per hectare (9.6%) were emitted. These data confirmed that between 10% and 15% of N-NH4+ applied in the field will be emitted in the form of nitrogen to the atmosphere, mostly (60%) as ammonia.

Less protein, less ammonia
In a third study, the aim was to determine the effect of the concentration of the protein in the ration on the ammonia and nitrous oxide concentration in dairy barns. Both gases, apart from the environmental repercussion previously pointed out, can harm both the health of humans and cattle. This study demonstrated that the concentrations of NH3 from the barn soil ranged between 7.1 mg of NH3 per cubic metre in low protein diets and 10.8 mg of NH3 per cubic metre in rations with higher ingestion of proteins. On the contrary, the amount of nitrous oxide was very similar with an average of 1.1 mg of N2O per cubic metre. However, despite the lack of response to nutritional changes, it was remarkable that the amount of N2O in the barns was greater than the atmospheric concentration (0.5 mg of N2O per cubic metre).

The results obtained underlined the importance of fitting the protein content of the rations to the animal requirements (according to production, lactation stage, genetics, etc) with the goal of optimising the efficiency of nitrogen use. This adjustment of the protein in the rations will moreover enable reducing the concentration of gaseous N losses in terms of NH3, N2O and NO from dairy barns and after manure application on grasslands.

Amaia Portugal | EurekAlert!
Further information:
http://www.elhuyar.com
http://www.basqueresearch.com/berria_irakurri.asp?Berri_Kod=2774&hizk=I

Further reports about: N-NH4+ NH3 gas emission milk production nitric oxide nitrogen gas nitrous oxide

More articles from Health and Medicine:

nachricht Millions through license revenues
27.04.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

nachricht New High-Performance Center Translational Medical Engineering
26.04.2017 | Fraunhofer ITEM

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>