Inmunidad humoral en bovinos vacunados contra estomatitis vesicular New Jersey, utilizando vacuna oleosa inactivada.

Con una vacuna inactivada experimental de estomatitis vesicular (EV) New Jersey, se vacunaron 10 vacas de la raza Holstein Friesan en período de lactancia y 10 novillas de la misma raza. Los animales estaban libres de anticuerpos contra la estomatis vesicular pues estaban ubicados en un área libre de la enfermedad. El grupo control sin vacunación incluyó 5 vacas y 5 novillas, los títulos de anticuerpos seroneutralizantes fueron determinados durante un período de 11 meses. Los bovinos vacunados respondieron con altos títulos de anticuerpos hasta los 9 meses, siendo el promedio de estos valores superior a 10 a la 4 en vacas y novillas. El grupo control no vacunado permaneció negativo durante el desarrollo del experimento. Se discute el significado de estos títulos y la importancia de este inmunógeno en la protección contra la enfermedad.Mora-Rubus ulmifoliu

Susceptibilidad de los sainos (Tayassu tajacu) al virus de la fiebre aftosa.

Se estudió la susceptibilidad y el posible estado de portador al virus de la fiebre aftosa en los sainos (Tayassu tajacu). Se inocularon 6 sainos con 10 elevado a la menos 6 DICC (Dosis Infecciosa Cultivo Celular) de la cepa 01 Campos-Brasil, por vía nasal e intradérmica en el rodete coronario. Se dejaron 4 sainos como controles sin inocular. Los sainos inoculados manifestaron fiebre a las 96 horas postinoculación y títulos seroneutralizantes a los 6 días. Solamente uno de los controles mostró aumento en la temperatura y desarrolló anticuerpos seroneutralizantes. Se aisló virus de moco nasal, saliva y materia fecalGanado de doble propósito-Ganaderia doble proposit

Enteric methane mitigation strategies for ruminant livestock systems in the Latin America and Caribbean region: a meta-analysis.

Abstract: Latin America and Caribbean (LAC) is a developing region characterized for its importance for global food security,producing 23 and 11% of the global beef and milk production, respectively. The region?s ruminant livestock sector however, is under scrutiny on environmental grounds due to its large contribution to enteric methane (CH4) emissions and influence on global climate change. Thus, the identification of effective CH4 mitigation strategies which do not compromise animal performance is urgently needed, especially in context of the Sustainable Development Goals (SDG) defined in the Paris Agreement of the United Nations. Therefore, the objectives of the current study were to: 1) collate a database of individual sheep, beef and dairy cattle records from enteric CH4 emission studies conducted in the LAC region, and 2) perform a meta-analysis to identify feasible enteric CH4 mitigation strategies, which do not compromise animal performance. After outlier?s removal, 2745 animal records (65% of the original data) from 103 studies were retained (from 2011 to 2021) in the LAC database. Potential mitigation strategies were classified into three main categories (i.e., animal breeding, dietary, and rumen manipulation) and up to three subcategories, totaling 34 evaluated strategies. A random effects model weighted by inverse variance was used (Comprehensive Meta-Analysis V3.3.070). Six strategies decreased at least one enteric CH4 metric and simultaneously increased milk yield (MY; dairy cattle) or average daily gain (ADG; beef cattle and sheep). The breed composition F1 Holstein ×Gyr decreased CH4 emission per MY (CH4IMilk) while increasing MY by 99%. Adequate strategies of grazing management under continuous and rotational stocking decreased CH4 emission per ADG (CH4IGain) by 22 and 35%, while increasing ADG by 22 and 71%, respectively. Increased dietary protein concentration, and increased concentrate level through cottonseed meal inclusion, decreased CH4IMilk and CH4IGain by 10 and 20% and increased MY and ADG by 12 and 31%, respectively. Lastly, increased feeding level decreased CH4IGain by 37%, while increasing ADG by 171%. The identified effective mitigation strategies can be adopted by livestock producers according to their specific needs and aid LAC countries in achieving SDG as defined in the Paris Agreement