ABSTRACT.- The aim of this study was to evaluate the effect of different factors on maternal protective behavior (MPB) of Nellore cows. A total of 3629 cows were evaluated around 24 h after calving, while their newborns were handled for navel care, ear tattoo and weighing. MPB was assessed by observing each cow reactions when its calf was caught in a corral pen. MPB score consisted of 5 levels, going from 1 (the cow paid no attention to the calf and remained indifferent to the procedure) to 5 (the cow showed aggressive behaviors toward the handler, trying to attack).
ABSTRACT.- A Mimosa pudica var. unijuga-associated toxicity affecting horses occurred in Araguari, Triângulo Mineiro, Southeast Brazil. Affected horses had gradual hair loss of the mane and tail and endocrine dermatosis after grazing for three months during the dry season on a paddock invaded by the plant. The main histological lesions include compact ortho-keratotic hyperkeratosis and numerous flame follicles. Toxicological analysis by HPLC-UV demonstrated 0.8 mg/g of mimosine in the leaves. © 2024 Published by Elsevier Ltd.
Los productores uruguayos carecían anteriormente de variedades de raigrás perenne con persistencia consistente y resistencia a enfermedades adaptadas a las condiciones locales, ya que la mayoría de los cultivares introducidos fueron desarrollados bajo condiciones ambientales diferentes. El desarrollo del cultivar Virazón tuvo como objetivo abordar esta brecha.
ABSTRACT.- Of the mycotoxicoses caused by molds contaminating grains or their byproducts, leukoencephalomalacia of horses and less frequently aflatoxicosis in cattle have been reported in South America. However, the most important group of mycotoxins in the region are those caused by fungi that infect forages and other types of plants and have regional distribution. In this group, ergotism is important, both caused by Claviceps purpurea infecting grains or by Epichloë coenophiala infecting Schedonorus arundinaceus.
ABSTRACT.- Small ruminant farming is of socio-economic and environmental importance to many rural communities around the world. The SMARTER H2020 project aims to redefine genetic selection criteria to increase the sustainability of the sector. The objective of this study was to analyse the selection and breeding management practices of small ruminant producers and breeders, linked with socio-technical elements that shape them.
ABSTRACT.- Paspalum notatum Flüggé is a subtropical grass native from the Americas and one of the main components of the subtropical South American grasslands. Although P. notatum exhibits a high forage productivity and persistence, some limitations are observed in the species, such as forage quality due to high lignin content. The development of efficient tissue culture and plant transformation protocols in cultivars for forage production are necessary to embrace novel genetic improvement through transgenesis and genome editing.
Mediante un enfoque ad-hoc que puede extenderse a cualquier cultivo y situación, nuestro objetivo fue estimar hasta dónde sería posible expandir e intensificar la producción sojera sin comprometer los recursos naturales. Adoptamos un modelo espacial con múltiples escenarios para estimar el área potencial y rendimientos del cultivo. Impusimos varias restricciones en función del riesgo de erosión, uso actual y alternativo del suelo, costos de transporte y logística y calculamos los márgenes económicos del cultivo.
A partir de la relación de máximo tamaño y número d de individuos en un rodal, se han desarrollado herramientas para orientar decisiones en el manejo poblacional de rodales. El presente artículo complementa la información presentada en la Revista INIA N° 71, en el que se introducía el Índice de Densidad de Rodal (IDR) como indicador de la competencia actual. Se introduce ahora el uso de Diagramas de Manejo de Densidad (DMD), como una opción que facilita la visualización del grado de competencia de los rodales y proporciona una guía teórica para el análisis y la prescripción de raleos.
