Abstract To study the stability of meat color in the post-slaughter storage process of Qinchuan cattle, three different bovine muscles, including longissimus dorsi (LD), knee round (KR) and psoas major (PM) muscles of Qinchuan cattle, were selected as research objects to determine the changes in meat color, myoglobin (Mb) relative content, pH, oxygen consumption rate (OCR), total iron, heme iron (HI) and other contents during storage. With the prolongation of the storage time, the relative content of oxymyoglobin (OxyMb) decreased, the relative content of metmyoglobin (MetMb) gradually increased, and muscle browning was due to the increase of a* value and hue value; Among them, HI and non-heme iron (NHI) reduced the stability of meat color by accelerating lipid oxidation, which was consistent with the results of Mb content and meat color index determining meat color stability. Therefore, the total iron content in muscles can also be used as an indicator of meat color stability.

ABSTRACT The success of the green revolution has prompted some analysts to suggest it can be extended more broadly to all poor farmers. This paper argues that suitable natural endowments are an important precondition for high input farming. Examining production functions across China, we find that outcomes are very climate sensitive. It follows that we also find that input demand functions are climate sensitive. Efforts to intensify farming in undeveloped regions should focus on places with suitable soils and especially climate. The results also suggest that farmers will partially adapt to climate change by altering their input intensity.

RESUMEN El éxito de la revolución verde ha propiciado que algunos analistas sugieran que ésta puede extenderse de manera generalizada a todos los agricultores pobres. Este trabajo sostiene que la presencia de condiciones naturales adecuadas es un prerrequisito importante para la agricultura de alto rendimiento. Al examinar las funciones de producción en China, se advierte que los resultados son altamente sensibles al clima. Por consiguiente, también las funciones de demanda de insumos son sensibles al clima. Los esfuerzos para intensificar la agricultura en regiones no desarrolladas deben centrarse en áreas con suelos y clima adecuados (en especial este último). Los resultados también sugieren que los agricultores modificarán parcialmente la intensidad de utilización de insumos para adaptarse al cambio climático.