Indian Journal of Science and Technology

Abstract

Objective: Estimate the values of repeatability and environmental factors that affect the variables Birth Weight (BW), Adjusted Weaning Weight (AWW) Daily preweaning weight Gain (DWG) in Colombian hair sheep (Ovino de Pelo Colombiano (OPC)). Methods/Statistical Analysis: The study was conducted with the productive and reproductive records in a sheepfold located in the municipality of Palmito Sucre, Colombia. We used 385 Birth Weight data - BW, 305 Adjusted Weaning Weight - AWW and Daily preweaning weight Gain - DWG, from births from 2012-2018. Variance analysis was performed for the variables studied, with the aim of sizing the significance of the fixed effects, using the same linear additive model. The value of the repeatability coefficient was calculated by means of the components of variance between and within sheep. The calculated repeatability was used to estimate the sheep index. Findings: The calculated values for the BW, AWW and DWG variables are similar to those of other authors for the same race. The analysis of variance for BW, AWW and DWG, reflects that the mother, sex C and TN effects were significant. Single-bred lambs had higher averages than multiple lambs for BW (3.2 ± 0.04kg and 2.7 ± 0.07kg) and AWW (12.4 ± 0.02kg and 10.6 ± 0.06kg) respectively. The birth number affected (p<0.01) the AWW. The repeatability indexes calculated for BW, AWW and DWG were: 0.148 ± 0.030; 0.16 ± 0.013; 0.13 ± 0.012 respectively. Application: The Sheep indices, derived in this study, are considered of great help for the genetic selection of sheep-mothers, for the characteristics BW, AWW and DWG, respectively.

Keywords: Adjusted Weaning Weight, Birth Weight, Daily Weight Gain, Parametrons Genetic