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Table 1 Population, biological and economic parameters for four alternative breeding schemes for Gumz sheep

From: Conservation-based breeding program design for genetic improvement in Gumz sheep in the western lowlands of Ethiopia

  Village-based schemes Central nucleus-based schemes
Scheme-1 Scheme-2 Scheme-3 Scheme-4
Proportion of populations in     
Production unit 1.0 1.0 0.95 0.90
Central nuclei    0.05 0.10
Proportion of ewes lambing 0.48 0.80
Lifetime use (years) of:     
Rams in central nucleus 0.67 0.67
Rams in villages 2.5 2.5 2.5 2.5
Ewes in central nucleus    5 5
Ewes in villages 5.0 5.0 5 5
Mating ratio (F/M)—villages 35 35 35 35
Mating ratio—central nucleus 35 35
Lambing interval (years) 0.60 0.60 0.60 0.60
Conception rate—central nucleus 0.85 0.85
Conception rate—villages 0.85 0.85 0.85 0.85
Age at first lambing (years) 1.14 1.14 1.14 1.14
Twinning rate 1.32 1.32 1.32 1.32
Survival of rams—villages 0.85 0.85 0.85 0.85
Survival of rams—central nucleus 0.85 0.85
Survival of ewes—villages 0.85 0.85 0.85 0.85
Survival of ewes—central nucleus 0.85 0.85
Lamb weaning rate—village 0.85 0.85 0.85 0.85
Weaning rate—central nucleus 0.90 0.90
Suitability for breedinga 0.90 0.90 0.90 0.90
Fixed costs per ewe (Birr) 12.0 12.0 158.9 158.9
Variable costs per ewe (Birr) 12.05 12.05 11.37 11.37
  1. aProportion of proven selection candidates physically suitable for breeding