Resultados preliminares de respuesta en un test de campo abierto en peces a alta y baja densidad

publishedTomo I . Sección: Sistemas Ganaderos-Economía y Gestión. Sesión: Conejos, abejas, peces y cerdos. Ponencia nº 2

Body composition in non reproduction adult males and females in long-term selection experiment for litter in mice

Earlier studies have shown that adult mice from a line selected for high litter size (S-line), in particular females, had higher residual food intake (RFI) than mice from a non-selected control line (C-line). It was suggested that this increase in RFI, in particular the mature selected females, may anticipate the metabolically stressful periods of pregnancy and lactation. The present study investigated whether body composition at maturity has been changed as a correlated response to selection, in order to support the offspring during pregnancy and lactation. Furthermore, part of the observed differences between individuals in RFI may be attributable to differing proportions of body protein and lipid. For these reasons, differences in body composition at maturity between males and females of the S-line and the C-line were investigated. Lipid percentage was similar for C-line animals and S-line females; S-line males had a significantly lower lipid percentage. Males had a higher protein percentage than females, in particular S-line males. The results show that body composition in adult non-reproductive females has not been affected as a correlated effect of selection for high litter size. Furthermore, the results suggest that the high lean content in S-line males may explain part of the high RFI compared with C-line animals. Body composition in S-line females probably does not explain the high RFI compared with S-line males and C-line animals. Factors other than protein and lipid levels must be responsible for the differences found between the lines and sexes in RFI

Sustainable development in circular agriculture: An illustrative bee¿legume¿poultry example

Circular economic principals of production are based on material flows through the system with minimum external inputs, recycling of resources, generating minimum waste, emissions, or pollution. Agriculture presents a major opportunity for the utilization of wastes, by-products and co-products in the development of a circular economy via the design of circular agricultural production systems and the creation of new sustainable value chains. The present work outlines an illustrative example of a circular bee¿legume¿poultry agricultural production system, based on the premise that: (1) there is an urgent need to prioritize pollinator stewardship and pollinator ecosystem restoration to counteract pollinator decline, (2) the EU Plant Protein Plan fosters EU-grown plant proteins including local legumes, and (3) poultry production is the most important segment of the animal production industry, and the fastest growing agricultural sub-sector. For the successful implementation of circular agriculture, multidisciplinary research is needed regarding all sectors involved, as well as practical evaluations and the realization of proof of concept depending on the geographical location. For sustainable circular agricultural practices to be adopted by agriculturists and agricultural workers, a culture shift is needed, with close cooperation between all actors involved