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[Methodological approaches in studing sociodemographic change in rural societies] | Enfoques metodologicos alternativos para el estudio del cambio sociodemografico en las sociedades rurales
1997
Gutierrez Sanchez, Sergio
[The soils in San Felipe del Progreso, Mexico State] | Los suelos del municipio de San Felipe del Progreso, Estado de Mexico
1997
Reyes Reyes, B. Gabriel
[Development theories. An approach and a proposal from the Latin American perspective] | Teorias del desarrollo. Un enfoque y una propuesta desde la perspectiva latinoamericana
1997
Liendo Vera, Isidoro
Technology assessment and transfer: an Australian perspective
1994
Williams, M. | Munro, R. (Department of Primary Industries and Energy, Canberra (Australia). Bureau of Resource Sciences)
Indicators for sustainable agriculture in the Asia-Pacific region
1994
Hamblin, A. (Cooperative Research Centre for Soil and Land Management, Glend Osmond (Australia))
Comparison of different methods in the determination of cholesterol
2002
Sterna, V. (Latvia Univ. of Agriculture, Sigulda (Latvia). Research Centre "Sigra")
The aim of the present study was to determine the level of cholesterol in the milk of the Latvia's cow herds, analyse differences between two different methods of cholesterol determination in milk. Milk samples were obtained from the cows of Latvian Brown and Black and White breeds. The milk fat and protein were analysed by Milkoscan 133, cholesterol content was determined colorimetricaly by Blur procedure with prior lipid extraction by Roese-Gottlieb method and by gas-chromatography method. The obtained results showed that the milk fat content was 4.48+-0.28%, protein was 3.03+-0.09%, cholesterol content in milk was 21.05+-2.01 mg 100 ml*[-1), when assayed by spectrophotometer SF 26 LOMO and 18.29+-1.73 mg 100 ml*[-1), when assayed by gas chromatography. There were no significant differences in cholesterol content between both determination methods.
Afficher plus [+] Moins [-]Factors affecting milk calcium and phosphorus content
2002
Kuebarsepp, I. | Henno, M. | Kaert, O. (Estonian Agricultural Univ., Tartu (Estonia))
The purpose of this study to compare milk calcium and phosphorus content of different breeds raised in Estonia. Based on obtained results, different factors and their magnitude of influence on the contents of calcium and phosphorus in milk were studied. On Polula Research Farm five trial groups were made up: Estonian Holstein breed (breeding value 115) (EHF-t), Estonian Holstein breed (breeding value 105...115) (EHF), Red-and-White Holstein breed (RHF), Estonian Red breed (EPK) and Estonian Native breed (EK). Milk samples were collected from five of each trial group twice a month during the year 2001. Calcium and phosphorus contents were determined by using IDF methods 36A:1992 and 42B:1990 in Dairy Laboratory of the Institute of Animal Science.
Afficher plus [+] Moins [-]Forest certification and free market
2002
Laguns, G. (Latvia Univ. of Agriculture, Jelgava (Latvia))
The forest certification becomes actual within the forest sector as a trade restriction when customers have started to require products from certified sources. There are several international documents that are regulating the use of international market restrictions. However some misunderstandings and problems with interpretation of free market and forest certification regarding certified product market still exist.
Afficher plus [+] Moins [-]Nutritive status of soils, biodiversity and yielding ability of leys in Estonian conventional and organic farms
2002
Geherman, V. | Ellermaee, O. (Estonian Agricultural Univ., Tartu (Estonia))
The paper gives a brief overview and describes the main results of comparison research in grassland management of conventional and organic farms. The aim of this study was to assess yielding ability and biodiversity of leys depending on the nutritive status of soil. The investigation based on field experiments that were carried out in several regions of Estonia: Laeaene (West), Harju (North) and Voru (South-East) county in 2001. In the research on the productivity of grass-clover leys of the first harvest year was measured the DM yield and content, the botanical composition of the sward and the concentration of crude protein on grass. The soil pHKCL and content of organic matter were measured, also the content in soil of soluble plant nutrients P, K, Ca and Mg was estimated by AL- (ammonium acetate extraction) method. The soil profiles were described and soils were classified. The dominant soil types in farms of West-Estonia were Calcic Cambisols and in North-Estonian farms Calcic Gleysols, in South-East Haplic Podzols types prevailed.
Afficher plus [+] Moins [-]Analysis of rye flour baking properties
2002
Brence, E. (Latvia Univ. of Agriculture, Jelgava (Latvia))
