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Effect of maturation on the quality of large rainbow trout reared in Estonia
2002
Ilves, P. | Paaver, T. (Estonian Agricultural Univ., Tartu (Estonia))
Dressing percentage and gonadosomatic index (GSI) of large (2-3 kg) rainbow trout (Oncorhynchus mykiss), produced in Estonian fish farms were estimated. The dressing percentage and GSI did not depend on fish size, but there was a strong negative correlation (r = - 081, p0.001) between themselves. During maturation the flesh color decreased significantly. The male trout had the palest color (13 color card units), the color of fillets of females decreased with maturation from 15 to 14. The immaturate females had the brightest color (17 color card units) and the highest slaughter yield (mean dressing percentage 87%, mean fillet yield 68%). Due to deterioration of quality (smaller slaughter yield and pale color) the maturation of trout causes profit loss for fish farmers and thus, rearing of late maturing all-female strains is recommended.
显示更多 [+] 显示较少 [-][New approaches in social research and the rural development] | Nuevos enfoques en la investigacion social y el desarrollo rural
1997
Rivera Herrejon, Gladis
[Methodology in the participative research of dairy farmers system of Mexico State] | Metodologia de investigacion participativa rural de sistemas campesinos de produccion de leche en el estado de Mexico
1997
Arriaga Jordan, Carlos | Espinoza Ortega, Angelica | Castelan Ortega, Octavio Alonso | Sanchez Vera, Ernesto
[Changes in the division and appraisement of femine work in Mazahua region, Mexico State] | Cambios en la division del trabajo y valorizacion del trabajo femenino en la region mazahua del estado de Mexico
1997
Vizcarra Bordi, Ivonne
[Participative research for rural development in CICA: reality or possibility?] | Investigacion participativa para el desarrollo rural en el centro de investigacion en ciencias agropecuarias: realidad o posibilidad?
1997
Sanchez Vera, Ernesto
[Rural participative research in the improvement of milk production systems in small scale in Mexico State] | Resultados de investigacion participativa rural en el mejoramiento de sistemas de produccion de leche en pequena escala en el estado de Mexico
1997
Arriaga Jordan, Carlos | Espinoza Ortega, Angelica | Castelan Ortega, Octavio Alonso | Rojo Guadarrama, Heidy | Valdes Martinez, Jose Luis | Albarran Portillo, Benito
Animal production technologies for integrated small farm systems in the Asia-Pacific region: relevance and assessment of needs for sustainable development
1994
Devendra, C. (International Development Research Centre, Singapore (Singapore))
Procedures for participatory research with multipurpose forages in Central American hillsides
2003
Hoek, Rein van der | Peters, Michael | Hoffmann, Vivian
Research on livestock, livelihoods and innovation
2017
Thorne, Peter J. | Conroy, C.
In this chapter, we have surveyed some of the issues relating to the implementation of participatory research for livestock development. Participatory research is only one type of research paradigm, and we do not see it as a replacement for traditional research with a technological focus. However, it can often help to generate research outputs that are much more focused on the needs of end-users in the world’s least developed countries (LDCs). Many of the issues related to applying participatory research to livestock constraints and opportunities are similar to those for other household enterprises. There is, however, a number of unique features of the role that livestock play in households, such as their capacity to support other aspects of the farming system through the provision of draught power and high quality organic matter for soil amendment (manure/compost), as well as their contribution to rolling household incomes. In smallholder farm systems, livestock are normally highly integrated in the system, both deriving and conferring benefits on other enterprises within the system, and their contributions to livelihoods are diverse and not just related to the provision of food. Much has been made of the negative impacts of livestock on environmental parameters in recent years. While effective management of livestock is essential to mitigate against their potentially negative environmental effects, it can be argued that these have often been overstated, and that good livestock management can actively support good environmental outcomes. Livestock populations are likely to increase in LDCs over the coming decades, so well planned research is likely to continue to be very important in supporting this trend by identifying approaches for increasing the productive efficiency of livestock enterprises.
显示更多 [+] 显示较少 [-]Changes of biology of the potato late blight pathogen Phytophthora infestans in last years. Review
2002
Bimsteine, G. (Latvia Univ. of Agriculture, Jelgava (Latvia))
Potato is the second important crop in Latvia. The area covered with potato is about 50 thousand hectares. Potato late blight caused by Phytophthora infestans (Mont.) de Bary is the most serious potato disease. Weather conditions in Latvia are very favourable for the development of potato late blight and it is occuring almost every year. The biology of P.infestans was the subject of a number of authors - plant pathologists. Research results about P.infestans population biology and epidemiology are presented in this review, especially focusing on the changes of pathogen biology.
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