Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal

La inseminación artificial es una de las tecnologías que han contribuido al progreso genético en diversas especies domesticas de interés económico; sin embargo, la información sobre la colección, características, evaluación y conservación del semen en la alpaca sigue siendo insuficiente. Una de las principales limitantes es la gran viscosidad que presenta el eyaculado, por lo que se requiere evaluar métodos que contribuyan a la licuefacción del semen fresco, someterlo a un protocolo de criopreservación y relacionarlo con la calidad espermática post congelamiento. Para el presente estudio, se utilizó 4 alpacas machos adultos entrenados para la colección de semen por vagina artificial. Se realizó la colección una vez a la semana por 6 semanas hasta un total de 24 muestras. Cada muestra fue evaluada en fresco e inmediatamente se dividió en dos fracciones iguales y se les ...

The aim of this study was to compare the expected genetic progress of the selection indexes for Corriedale sheep based on performance and progeny tests. The study was carried out in the “Corpacancha” Production Unit of the SAIS Pachacútec, Junín, Peru, at an altitude of 4150 meters above sea level. A performance test was used based on bodyweight and fleece weight, and the mixed model to obtain the best unbiased linear predictor (BLUP), where the fixed effects were sex, type of parturition and a covariate age at weaning. The progeny was 118 females and 73 males. The bodyweight at first shearing was 65.86 ± 13.25 kg and the clean fleece weight of 5.99 ± 1.44 kg. The fertility rate was 75%, birth rate 109.7%, twin births 4.8% and 1.7 services/pregnancy. The bodyweight correlation with fleece weight was 0.47, suitable for the selection indices. The expected genetic progress of the pe...

The aim of this study was to compare the expected genetic progress of the selection indexes for Corriedale sheep based on performance and progeny tests. The study was carried out in the “Corpacancha” Production Unit of the SAIS Pachacútec, Junín, Peru, at an altitude of 4150 meters above sea level. A performance test was used based on bodyweight and fleece weight, and the mixed model to obtain the best unbiased linear predictor (BLUP), where the fixed effects were sex, type of parturition and a covariate age at weaning. The progeny was 118 females and 73 males. The bodyweight at first shearing was 65.86 ± 13.25 kg and the clean fleece weight of 5.99 ± 1.44 kg. The fertility rate was 75%, birth rate 109.7%, twin births 4.8% and 1.7 services/pregnancy. The bodyweight correlation with fleece weight was 0.47, suitable for the selection indices. The expected genetic progress of the pe...

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal

The aim of this study was to compare the effect of N, P and K fertilization on the production of aerial biomass of two native grasses Festuca dolichophylla and Festuca humilior. The experiment was carried out in the SAIS Túpac Amaru, Junín, Peru, at an altitude of 4186 m. The treatments were N, P, K, NPK and a control. The nitrogen, phosphorus and potassium doses were 36.24, 4.27 and 29.92 kg/ha, respectively. The model of blocks with orthogonal contrasts was used. The variables were: fresh aerial biomass (kg/ha), dry aerial biomass (kg/ha) and percentage of dry matter. Fresh aerial biomass was 783.9±110.7 and 662.9±24.9 kg/ha, dry aerial biomass was 477.6±62.9 and 410.2±15.4 kg/ha, and percentage of dry matter was 64.11±1.82 and 61.47±0.56% in F. dolichophylla and F. humilior, respectively, with F. dolichophylla being the species with the highest production of aerial biomass (p&...

The aim of this study was to compare the effect of N, P and K fertilization on the production of aerial biomass of two native grasses Festuca dolichophylla and Festuca humilior. The experiment was carried out in the SAIS Túpac Amaru, Junín, Peru, at an altitude of 4186 m. The treatments were N, P, K, NPK and a control. The nitrogen, phosphorus and potassium doses were 36.24, 4.27 and 29.92 kg/ha, respectively. The model of blocks with orthogonal contrasts was used. The variables were: fresh aerial biomass (kg/ha), dry aerial biomass (kg/ha) and percentage of dry matter. Fresh aerial biomass was 783.9±110.7 and 662.9±24.9 kg/ha, dry aerial biomass was 477.6±62.9 and 410.2±15.4 kg/ha, and percentage of dry matter was 64.11±1.82 and 61.47±0.56% in F. dolichophylla and F. humilior, respectively, with F. dolichophylla being the species with the highest production of aerial biomass (p&...

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal