The purposes of this study were a) to evaluate the effect of random factors such as litter (L) and fixed effects such as season (S), calf sex (CS), and parity (P) on birth weight (BW) and weaning weight (WW); and b) to estimate the phenotypic correlation between BW and WW. The study was conducted in the Cieneguilla guinea pig farm of the Universidad Nacional Agraria La Molina. The data comprised 5460 and 3514 records for BW and WW respectively of improved guinea pigs. The data was collected from January 2009 to July 2010. Weaning was at 14 days of age. The feeding system was based on broccoli crop residues (Brassica oleracea italica) and concentrate. SAS MIXED procedure (v 9.1) was used to analyze the mixed models. Total born (TB) was used as covariate for BW and born alive (BA) and age of weaning (AW) were used as covariate for WW. BW was influenced (p<0.01) by TB, S, CS and P, and W...

The study was carried out at the Cieneguilla guinea pig farm of La Molina National Agrarian University, Lima. The objective of the study were to evaluate the association of fixed factors such as season (E), parity (NP), and covariates such as maternal weight at parity (PMP), total born (TN), number of live births (LB) and age at weaning (EDC) with total born (TN), number born alive (NV), number weaned (ND), litter weight at birth (PCN), and litter weight at weaning (PCD), and to estimate phenotypic correlations between the maternal traits. Data was collected from 1302 litters collected from January 2009 to July 2010. Analysis of variance and F tests were performed using the GLM procedure of SAS (v. 9.1). The statistical analysis for TN and NV adjusted for the covariate PMP differences were obtained for E and NP (p<0.01); for ND adjusted for the covariate PMP differences were obtained ...

Los objetivos del estudio fueron a) evaluar el efecto de factores al azar, como efecto de camada (C) y efectos fijos, como estación (E), sexo de la cría (SC), y número de parto de la madre (NP) sobre el peso al nacimiento (PNC) y peso al destete de las crías (PDC), y b) estimar la correlación fenotípica entre PNC y PDC. El estudio se desarrolló en la Granja de Cuyes de Cieneguilla de la Universidad Nacional Agraria La Molina. Se analizaron 5460 datos de PNC y 3514 datos de PDC recolectados de cuyes mejorados entre enero de 2009 a julio de 2010. El destete se realizó a los 14 días de edad en promedio. La alimentación fue en base a residuos de cosecha de brócoli (Brassica oleracea italica) y alimentos balanceados elaborados en la granja. Se utilizó el procedimiento MIXED de SAS (v 9.1) para el análisis de modelos mixtos. El total de nacidos (TN) se utilizó como covariable par...

The study was carried out at the Cieneguilla guinea pig farm of La Molina National Agrarian University, Lima. The objective of the study were to evaluate the association of fixed factors such as season (E), parity (NP), and covariates such as maternal weight at parity (PMP), total born (TN), number of live births (LB) and age at weaning (EDC) with total born (TN), number born alive (NV), number weaned (ND), litter weight at birth (PCN), and litter weight at weaning (PCD), and to estimate phenotypic correlations between the maternal traits. Data was collected from 1302 litters collected from January 2009 to July 2010. Analysis of variance and F tests were performed using the GLM procedure of SAS (v. 9.1). The statistical analysis for TN and NV adjusted for the covariate PMP differences were obtained for E and NP (p<0.01); for ND adjusted for the covariate PMP differences were obtained ...

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Doctorado en Ciencia Animal