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Collaborative project: Effects of lowering dietary nitrogen and supplementing rumen-protected amino acids in lactating dairy cow diets on performance, nitrogen excretion and greenhouse gas emissions - subproject 4 (N-Reduk)
Project
Project code: 28RZ372042
Contract period: 07.08.2014
- 31.03.2018
Budget: 238,103 Euro
Purpose of research: Experimental development
In this project, feeding trials on lactating dairy cows form the basis to evaluate different levels of protein supply to dairy cows and the supplementation of diets with rumen-protected amino acids. Lowering dietary nitrogen reduces nitrogen proportion in the whole production cycle. The objective is to quantify the effects of lowering dietary nitrogen on nitrogen excretion and ammonia emission and express the effect relative to one unit of edible protein from milk. At the same time, the potential savings of protein supplements such as soybean and rapeseed meals will be highlighted. The targeted use of rumen-protected amino acids in compound feeds also aims at gathering operating experience as regards the availability, processing and stability of supplemental rumen-protected amino acids in the feed industry. This will eventually allow establishing feeding concepts which are suitable for daily use.Feed analyses and ration planning Initially, the feeding value of forages and concentrates is estimated from laboratory data using established methods. This involves the amino acids lysine and methionine. Subsequently, after on-farm ration planning, the conceptual design and production of compound feeds for the feeding trials will be performed by the project partners Agravis Futtermittel GmbH and Agrifirm Deutschland GmbH. The detailed planning creates the condition for matching the targeted ration composition. Feeding trials During the 18-months experimental phase of the project, three feeding trials will be conducted at the 'Versuchs- und Bildungszentrum Landwirt-schaft Haus Riswick” of the Chamber of Agriculture North Rhine-West-phalia. Each trial comprises 2 x 48 lactating dairy cows and data will be collected over 120 days. Feed and water intake will be measured indivi-dually throughout the trials using an automated feed and water intake recording system. Based on urinary and faecal spot samples and using established regression equations, nutrient excretion and organic.
Section overview
Subjects
- Animal nutrition
