Utilización de leche descremada y suero de mantequilla en la crianza artificial de terneras Lucerna

Se evaluó un sistema de crianza artificial en terneras Lucerna con una mezcla de leche descremada y suero de mantequilla, en la Hacienda "Lucerna", en Bugalagrande, Valle del Cauca, Colombia. Se distribuyeron 18 animales en dos grupos en un diseño completamente al azar. El grupo control recibió, durante 110 días, 320 kg de leche entera y el grupo experimental, 320 kg de una mezcla de 50% de leche descremada y 50% suero de mantequilla. Se estudiaron los promedios del peso corporal, perímetro torácico y la alzada de las terneras. Los análisis de varianza no indicaron diferencias significativas entre los tratamientos, pero éstas fueron altamente significativas cuando se analizaron en el tiempo y en la interacción tratamientos por tiempo, lo que presupone que los dos grupos experimentales, tendieron a presentar diferencias en sus respuestas biológicas durante la época en que se suministraron. Pruebas de regresión por polinomios ajustados, confirmaron los resultados de los análisis de varianza. Se infiere que por el uso de leche descremada y suero de mantequilla se puede obtener un crecimiento y desarrollo normal en terneras Lucerna.

 The main objetive of this research, was to evaluate the artificial grow system of Lucerna calves, by using a mixture of skim milk and buttermilk. The test was carried out at Lucerna farm, which is located at the Cauca Valley of Colombia. Sixteen calves arranged in two groups, were used and analized statistically under a complete random design. The treatments were as follows: the chek group, fed during 110 days with 320 kg of a complete milk, and the experimental group, fed with 320 kg of a mixture of 50% of skim milk and 50% of buttermilk. The parameters under study were the mean weight, the toraxic diameter and the size of calves. The statistical analizes did not show any significant differences between treatments, but these were highly significant when analized over the time and the interaction between treatments and time. These results suggest a tendency of the two experimental groups to show differences in their biological responses, depending on the time in which they were analized. Regression analizes by adjusted polynomial confirm the results. It is suggested that by the use of skim milk and buttermilk mixture it is possible to obtain grow and normal development of Lucerna calves.