Frente al problema del calentamiento global y cambio climático, los pequeños rumiantes serán clave para mantener la producción de proteína de origen animal, ya que tienen superioridad en la tolerancia al calor en comparación con otros animales domésticos. Los ovinos de pelo han demostrado ampliamente su habilidad para crecer y reproducirse en escenarios naturales de altas temperaturas y baja disponibilidad de nutrientes. La adaptación que presentan estos ovinos al estrés calórico está dada por una compleja interacción entre los mecanismos de termorregulación y la presencia de factores genéticos, lo cual les confiere una plasticidad fisiológica para tolerar climas calientes sin afectar drásticamente la productividad. Bajo condiciones de México, los ovinos de pelo se encuentran distribuidos en los diferentes climas debido a que no presentan una estacionalidad reproductiva, y esta característica permite a la industria ovina mantener una producción de carne constante a través del año; sin embargo, poca atención se ha puesto sobre su habilidad para producir en condiciones de estrés calórico. En este sentido, la presente revisión tiene como objetivo hacer una descripción de los efectos del estrés calórico sobre el comportamiento reproductivo, el crecimiento de corderos y la termorregulación de ovinos de pelo.

Chronic kidney disease (CKD) is a recognized public health problem and key determinant of poor health outcomes. In Mexico, this condition has been associated with high and significant risk of death in COVID‐19 patients; however, not enough attention has been given to the vulnerable population as the increasing numbers and fatality rates suggest. This study evaluated the effect of interaction between CKD condition and other risk factors (sex, diabetes, hypertension and obesity) on the survival rate of positive patients for COVID‐19 in Mexico. The results from this study support that CKD patients is a population at high risk for mortality for COVID‐19 and that COVID‐19 positive inpatients with CKD and diabetes are highly vulnerable to death.

With the aim to assess the effect of short-term thermal stress on physiological traits of ewes an experiment was designed. Fourteen hair sheep ewes were selected during early reproductive management and randomly segregated in two groups. Control group (CG) with indoor conditions, and an experimental group (EG) under continuous outdoor conditions without shadow accessing during 14 days (d). Respiratory frequency (RF), rectal temperature (RT) and infrared image temperatures were estimated. Traits were measured for 8 d twice a d (9:00 am and 15:00 pm). Environmental temperature and humidity were monitored, and temperature and humidity index was estimated. All physiological and environmental traits showed significantly variation by group and time of measurement (P < 0.001). RT and RF were significantly higher for EG and during pm measurements. Environmental conditions indicated thermal stress conditions for outdoor EG during the afternoon was related ultimately with respiratory mechanism as the main indicator of continuous thermal stress. Head infrared image temperature was a good predictor of body temperature.

Mexico is the native site of 10 species of the genus Ictalurus, among which the Channel Catfish I. punctatus has great presence in worldwide aquaculture. Wild populations of catfish not only constitute a biological resource but have a great potential for aquaculture. Recently, this species was classified as an invasive organism by the Mexican government. The aim of this study was to determine the structure and genetic diversity of Channel Catfish belonging to native and introduced freshwater populations within Mexico. Using 11 DNA microsatellite loci, we analyzed 292 fish sampled from four rivers and five reservoirs. Observed heterozygosity values ranged between 0.66 and 0.80. The genetic distance analysis showed low to high differentiation among populations (overall genetic differentiation index FST = 0.14). Bayesian coancestry analysis identified two ancestral groups. A single management population on central Tamaulipas can be suggested. The findings of the present study provide the basis for future characterization of productive traits of Mexican Channel Catfish populations in order to use the species as a breeding source for aquaculture. The lower Rio Grande population is one of the most ancient and ecologically relevant Channel Catfish populations in Mexico, and this study identifies it as the most vulnerable. Free‐living populations of Channel Catfish, although they have been heedlessly spread, constitute a valuable natural resource that deserves our best effort to preserve.

Channel catfish (Ictalurus punctatus) is one of the endemic fishes of North America with the greatest potential for aquaculture. Despite this, data of its current distribution is scare and many aspects of its dynamic and productive performance remain unknown. In the present study, results are reported from a literature search and field analysis for describing the current status of channel catfish in Mexico regarding its historical and current geographical distribution as well as the problems faced by fish farmers and production systems. We were able to identify a lack of information and indicators to properly assess the extent of the species natural habitat and its productive potential. The quality and availability of water are among the main problems of the industry. Food costs represent the larger cost-loss for producers and there is great heterogeneity on the management of both breeding and production farms. Much of the production dynamics follows a pattern of trial and error. It became clear the need to optimize and standardize the processes on the channel catfish production system and to properly characterize domestic and wild populations to maximize their potential.