Estimation of Genetic Parameters for Reproductive Traits in Horro Sheep Managed Under On-farm Conditions
DOI:
https://doi.org/10.20372/star.v9i3.03Keywords:
Community-based breeding, Horro sheep, Genetic parameters, reproductive performanceAbstract
The study was carried out on flocks of Horro sheep owned by participants in a community-based sheep genetic improvement programme in the Horro district, Horro Guduru Wallaga zone, Oromia Regional State, Ethiopia. The objective of the study was to estimate genetic parameters for reproductive traits (lambing interval and annual reproductive rate) and to evaluate the reproductive performances of the flock. A total of 307 records collected on 1398 breeding ewes sired by 101 breeding rams from 2010 to 2015 were used for both lambing interval and annual reproductive rate produced. The General Linear Model (GLM) Procedures of the Statistical Analysis System (SAS, 2016, version 9.4) were employed to determine the effects of fixed factors. (Co)Variance components and genetic parameters were estimated by restricted maximum likelihood procedures (REML) applying the VCE 4.2.5 package of Groeneveld (1998). The least-squares means obtained for lambing interval and annual reproductive rate were 8.13±0.06 months and 2.02±0.02, respectively. Estimates of direct heritability (h2a) obtained from the simple animal model were 0.01±0.01 and 0.01±0.02 for lambing interval and annual reproductive rate, respectively. The laming interval and the annual reproductive rate obtained in the current study enable producers to have about three lambings per two years, which requires improved feeding management. The direct heritability (h2a) estimates obtained in the current study were very low. The likely reason may be the size and quality of data used and the model used for the (Co) Variance estimation.
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