I think the Conservation Research Program in the U.S. could be a good example. 

http://www.npcn.net/documents/CRP%20Economic%20Rpt.pdf

As I've seen through some different approaches, the WOCAT one is a realistic and practical approach

http://www.unccd.int/Lists/SiteDocumentLibrary/Publications/CSD_Benefits_of_Sustainable_Land_Management%20.pdf

https://www.wocat.net/fileadmin/user_upload/documents/Books/SLM_in_Practice_E_Final_low.pdf

Dear Mounir,

The Capital Institute has a whole stream of research dedicated to grasslands http://fieldguide.capitalinstitute.org/grasslands.html. Furthermore, there is a conservation program currently active in Vermont working on bridle grassland conservation that integrates sustainable management. http://vtecostudies.org/projects/grasslands/

I think the first one is more relevant to your question 

http://link.springer.com/book/10.1007/978-4-431-54052-6

This is a study on grassland in Mongolia 

http://link.springer.com/book/10.1007/978-4-431-54052-6

This is a study on grassland in Mongolia 

Dear Dr, Mounir

The best examples I ever remember are from Mrs. Elinor Östron, Economic Nobel Prize in 2009. You could statr with this simple brochure:

https://www.kva.se/globalassets/priser/ekonomi/2009/pop_ek_en_09.pdf

Best regards,

There is a very interesting (ongoing) project in Uruguay by the National research institute, working with co-innovation with cattle family farmers improving productivity, income and ecosystem service provision with grazing management as the basis:

http://www.inia.uy/Proyectos/Paginas/PF_07.aspx

In this congress there are many presentations by Ruggia, Scarlato, Aguerre, Paparamborda and Blumetto: http://fsd5.european-agronomy.org/presentations.html

There are methodology basics from Virginia Dale, McBride, and Esther Parish available.

Hi Dear!

To get all thing about your issues, you better contact Professor Zerihun Woldu of Addis Ababa University. He has done his M.Sc. and P.h.D. in grassland vegetation.

Best!