Breeding programs for smallholder sheep farming systems: I. Evaluation of alternative designs of breeding schemes
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Solomon Gizaw Assefa, Barbara Rischkowsky, Anne Valle Zarate, Aynalem Haile, Johan van Arendonk, Ally Okeyo Mwai, Tadelle Dessie. (31/10/2014). Breeding programs for smallholder sheep farming systems: I. Evaluation of alternative designs of breeding schemes. Journal of Animal Breeding and Genetics, 131(5), pp. 341-349.
Village- and central nucleus-based schemes were simulated and evaluated for their relative bio-economic efficiencies, using Ethiopia’s Menz sheep as example. The schemes were: village-based 2-tier (Scheme-1) and 1-tier (Scheme-2) cooperative village breeding schemes, dispersed village-based nuclei scheme (Scheme-3), conventional 2-tier central nucleus-based scheme (Scheme-4), and schemes linking a central nucleus and village multiplier nuclei with selection in central nucleus (Scheme-5) or in both central and village nuclei (Scheme-6). Among village-based schemes, Scheme-1 gave the highest genetic progress, while Scheme-2 was economically the most efficient with genetic gain in the breeding objective of Birr 5.6 and a profit of Birr 37.2/ewe/year. The central nucleus schemes were more efficient than the village schemes. Scheme-4 was the most efficient with genetic gain in the breeding objective of Birr 13.5 and a profit of Birr 71.2, but is operationally more difficult as it requires a very large central nucleus. The choice between village and central nucleus-based schemes would depend on local conditions (availability of infrastructure, logistics and technical knowhow and support). Linking central nucleus with village- based nuclei (Scheme-6) would be a feasible option to overcome the operational difficulties of the conventional central nucleus scheme. If a village- based breeding program is envisaged as should be the 1st step in most low-input systems, then Scheme-2 is the most efficient. To scale out to an entire Menz breed level, Scheme-3 would be recommended.
Gizaw Assefa, Solomonhttps://orcid.org/0000-0002-7489-062X
van Arendonk, Johanhttps://orcid.org/0000-0003-2592-3947
Mwai, Ally Okeyohttps://orcid.org/0000-0003-2379-7801