RESUMEN.- Amaranthus hybridus (syn: quitensis), conocido como yuyo colorado, es actualmente una de las malezas más importantes en los sistemas agrícolas uruguayos, generando graves pérdidas en la producción de cultivos por su elevada capacidad de competir por recursos como agua, luz y nutrientes. Recientemente, se observaron casos de falla de control después de la aplicación de glifosato, principal herbicida utilizado en su manejo. El objetivo de este trabajo fue determinar el nivel de resistencia a glifosato en los biotipos de A.

RESUMEN.- Amaranthus hybridus (syn:quitensis), conocido como yuyo colorado, es actualmente una de las malezas más importantes en los sistemas agrícolas uruguayos, generando graves pérdidas en la producción de cultivos por su elevada capacidad de competir por recursos como agua, luz y nutrientes. Recientemente, se observaron casos de falla de control después de la aplicación de glifosato, principal herbicida utilizado en su manejo. El objetivo de este trabajo fue determinar el nivel de resistencia a glifosato en los biotipos de A.

CONTENIDO. -- Síntesis de la situación sgroclimática de noviembre-- Perspectivas climáticas trimestrales elaboradas por el IRI de la Universidad de Columbia (Más información puede encontrarse en el sitio del IRI:http://www.iri.columbia.edu) -- Índice de vegetación (NDVI) -- Precipitaciones -- Porcentaje de agua disponible (PAD) -- Agua no retenida (ANR) -- Índice de bienestar hídrico (IBH) -- Perspectivas climáticas dic-ene-feb elaboradas por el IRI de la Universidad de Columbia.

Farmers use various pesticides to control pests, weeds, and diseases in order to meet the demands in terms of yields and quality of agricultural products. The use of pesticides in Uruguay has increased steadily since 2000(1). The total number and amount of active substances imported increased from 3.9 to 10.6 thousand tons between years 2000 and 2020. Within plant protection products, herbicides had the highest increase, from 2.1 thousand tons in 2000 to 9.5 thousand tons in 2020(1). Similar trends are observed worldwide(2).

As our understanding of ovarian function in cattle has improved, our ability to control it has also increased. The development of Fixed-Time Artificial Insemination (FTAI) protocols at the end of the 20th century has increased exponentially the number of animals inseminated over the last 20 years. The main reasons for this growth were the possibility of obtaining acceptable pregnancy rates without heat detection and, above all, the induction of cyclicity in suckled cows in postpartum anestrus and prepubertal heifers at the beginning of the breeding season.

As our understanding of ovarian function in cattle has improved, our ability to control it has also increased. The development of Fixed-Time Artificial Insemination (FTAI) protocols at the end of the 20th century has increased exponentially the number of animals inseminated over the last 20 years. The main reasons for this growth were the possibility of obtaining acceptable pregnancy rates without heat detection and, above all, the induction of cyclicity in suckled cows in postpartum anestrus and prepubertal heifers at the beginning of the breeding season.

This article provides an overview of assisted reproductive technologies (ART) and genome engineering to improve livestock production systems for the contribution of global sustainability. Most ruminant production systems are conducted on grassland conditions, as is the case of South American countries that are leaders in meat and milk production worldwide with a well-established grass-feed livestock. These systems have many strengths from an environmental perspective and consumer preferences but requires certain improvements to enhance resource efficiency.