Browsing by Autor "F. Rojas"

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Small animal species in the livelihoods of small-scale farmers in tropical Bolivia
(Cambridge University Press, 2004) R.T. Paterson; F. Rojas
In the Bolivian Department of Santa Cruz, the Provinces of Sara and Ichilo lie some 100 km North-West of the city of Santa Cruz de la Sierra, where they occupy an area of about 21,000 km 2 . Most of the region is a flat, alluvial plain, 350-450 m above sea level, with young soils prone to localized, seasonal waterlogging, although the land becomes undulating and rises to 800 m as it approaches the foothills of the Andes to the west. The soils are moderately fertile with pH values often in the range of 4.5 to 5.5.
THE CRIOLLO CATTLE PROJECT OF SANTA CRUZ, BOLIVIA
(Cambridge University Press, 1984) J.V. Wilkins; F. Rojas; Lina Marcela Escobar Martínez
SUMMARY Plans to improve the milk production ability of the Criollo in Bolivia are outlined. The background problems are stated, and experiments to improve by crossbreeding are described. The Criollo improvement project which makes use of the purebred Criollo was planned in two stages. The first was the attempt to measure the performance of Criollo cows purchased from commercial herds, and milked without their calves. The second stage was the comparison of performance with the results of the crossbred trial. The intentions and plans to progeny test the Criollo bulls are summarized and the hopes of producing bulls for sale and use on temperate breeds of cow are described. The problems encountered in the project are stated, and the results are viewed in the context of work with Criollo in other countries.