Abstract:The objective of this study was to evaluate the effect of monensin addition on the total dry matter intake, in goat diets, composed of 30 % alfalfa hay and 70 % corn. Four fistulated cross breed goats (Nubian x Creole), 39.77 ± 1.07 kg live body weight (BW), were used in experimental design. Two experiments were carried out: I) Determining total dry matter intake (TDMI), pasture dry matter intake (PDMI), total daily and hourly intake (TDHI) and total dry matter digestibility (TDMD); II) Determining ruminal pH. Treatments consisted of an instance without monensin (D0), and another one with monensin (D1). In both cases, intake level was adjusted to 3 % of BW. There were no significant effects (p < 0.05) on TDMI, PDMI, TDHI, TDMD and BW. The registered TDHI during the 12 h after feed had an effect on time. The area below the curve, with a 5.8 and 6 pH threshold, proved a significant linear drop-off (p < 0.05) for D1. As regards the hours with pH value below pH threshold, there were no significant differences (p > 0.05) between treatments, only a tendency (p = 0,074) to keep pH values below 5.8 for a greater number hours in D0. The average pH of the day showed a tendency to be higher (p = 0,056) for D1. The lowest ruminal pH was observed between the 8 and 12 h after food intake, and with significant differences (p > 0.05) between hours, but the treatment had no effects on the evolution of pH in time. Therefore, we can conclude that the addition of monensin in highly energetic diets for goats had a moderating effect in the ruminal pH, and in the number of daily food concentrate meals. However, there was no register of acute acidosis with these diets.
Debido al Aislamiento Social, Obligatorio y Preventivo (ASPO) por el COVID-19, la Universidad Nacional de La Plata comunicó a sus docentes la necesidad de mantener la continuidad pedagógica en todas sus dependencias. En la Facultad de Ciencias Veterinarias las TIC´S se comenzaron a utilizar ampliamente en los últimos años para mejorar los modelos formativos y organizativos que sustentan el aprendizaje. El objetivo fue describir la experiencia en el desarrollo del curso Genética General durante el ASPO-COVID-19, mediado por TIC´S y analizar el desempeño de las cohortes 2019 (cursada presencial) y 2020 (cursada virtual). Se utilizó el entorno virtual Moodle 3.1 como soporte didáctico. Las Actividades Presenciales Obligatorias se convirtieron en Actividades Virtuales Obligatorias. El total de alumnos en estudio fue de 296 de los cuales 150 corresponden a la cursada del 2019 y 146 a la del primer cuatrimestre 2020. Cuando se compararon las condiciones de cada alumno, no se encontraron diferencias significativas entre cantidad de promocionados, aprobados, desaprobados y ausentes entre los dos grupos. El uso de las TIC´S durante el ASPO nos permitió desarrollar el curso sin mayores inconvenientes; fortaleciendo la relación entre docentes y estudiantes.
La variabilidad productiva de las cabras muestra que son predominantemente animales doble propósito, lo que permite inferir una mayor adaptación a los ambientes restrictivos en que se desempeñan, por lo que se pueden seleccionar como pie de cría. La caracterización de la diversidad genética de las cabras de la Zona de Influencia de la Universidad Nacional de La Plata a través de sus variables morfológicas, zoométricas, fanerópticas y moleculares demuestra la importancia de esta población como fuente de biodiversidad. La relación entre los caracteres de producción y los marcadores genéticos permite obtener líneas que puedan ser seleccionadas para carne, leche o doble propósito sin pérdida de la aptitud.
The aim of this study was to evaluate the effect of an alternative protein source (hydrolyzed feather meal vs meat meal) and two levels (high:170 g and low:140 g CP) on performance and carcass quality traits in rabbits. One hundred twenty eight New Zealand x Californian rabbits were used, weaned at 28 days of age. The experimental design was a 2x2 factorial arrangement: two sources of animal protein (Control: MM and alternative: FM) and two levels of crude protein (CP: 17% and 14%). The digestibility of diets was evaluated based on 10 animals per treatment (between 49 and 56 days of age), using cages provided with individual faeces collectors. Daily weight gain (DWG), feed conversion ratio (FCR), dry matter digestibility (DMD), feed cost per rabbit and feed cost per kg of meat produced, were recorded. Forty animals (10 for each treatment) were slaughtered at 75 days of age, following the standard procedures of rabbit slaughter. Data were analyzed by ANOVA, GLM, SAS. The protein level of diet significantly influenced weights at 61 days, DMD, FCR and at slaughter, percentage of gastro-intestinal tract, weight of the stomach (full and empty), weight of the full caecum, hot carcass weight and carcass yield. The source of protein significantly influenced feed consumption, dry matter intake, feed conversion ratio, dressing percentage and feed cost per rabbit. Although the inclusion of FM in the diet did not generally affect performance traits, it did affect performance on the protein-restricted diets. The inclusion of feather meal in the diet appears to be the subject of the cost of this by-product when diet is formulated.
Summary:The aim of this study was to evaluate the effect of the level of hay and concentrate on total hay intake and supplied already, the additive/substitutive effect and total apparent digestibility of the diet intake in diets for goats. Experiment I: diets: Alfalfa hay (A1), Alfalfa hay + corn (0.5% LW/day) (A2), + 1% LW/day (A3), + 1.5% LW/day (A4). Experiment II: diets: Natural grassland hay (CN) (R1), hay CN + corn (0.5% LW/day) (R2), hay CN + corn (1% of LW/day) (R3), + 1.5% of LW/day) (R4). Intake, ratio forage/concentrate and total apparent digestibility were calculated. Experiment I: There were no effects (p> 0.05) on the CMST for the corn tested levels and recorded a linear decrease (p <0.05) in the CTFDN, CTFDA and CTPB. The CMSF decreased linearly (p <0.05) with increasing amounts of corn by verifying a hay effect on the concentrate. The F/C was different (p <0.05) in all treatments. The DTAIVMS increases linearly (p <0.05) with the content of corn in the diet. Experiment II: a linear increase (p <0.05) on the CMST and CTPB with increasing corn in diet and no differences (p> 0.05) on the CMSF, CTFDN and CTFDA is observed. The F/C and CTPB differ (p <0.05) among all the diets tested. The DTAIVMS increases linearly (p <0.05) with the content of corn in the diet. Therefore, it can be concluded that the increase of maize levels improved the total digestibility of the ration consumed and the substitute or additive effect depended on the quality of the hay used.
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