Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs
his study evaluated alternative breeding objectives and schemes for crossbred goats in a village/ community breeding program. A single-tier breeding structure was assumed in the optimisation of this breeding program. Considered were two selection schemes; within-group (WG) and across-groups (AG), an...
| Autores principales: | , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
2012
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| Acceso en línea: | https://hdl.handle.net/10568/33421 |
| _version_ | 1855522383814721536 |
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| author | Bett, R.C. Okeyo Mwai, Ally Kosgey, I.S. Kahi, A.K. Peters, Kurt J. |
| author_browse | Bett, R.C. Kahi, A.K. Kosgey, I.S. Okeyo Mwai, Ally Peters, Kurt J. |
| author_facet | Bett, R.C. Okeyo Mwai, Ally Kosgey, I.S. Kahi, A.K. Peters, Kurt J. |
| author_sort | Bett, R.C. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | his study evaluated alternative breeding objectives and schemes for crossbred goats in a village/ community breeding program. A single-tier breeding structure was assumed in the optimisation of this breeding program. Considered were two selection schemes; within-group (WG) and across-groups (AG), and three alternative selection objectives; ALT I- defined based on relative weights (RWs) derived from producers’ preferences, ALT II- based on economic values (EVs) without risk and ALT III- based on risk-rated EVs, at different intensities of buck selection (proportion of bucks selected, P = 0.02 and 0.04) and selection criteria (mass and BLUP).
The genetic gains (ΔG) in the breeding-objective traits, aggregate responses (RH), total economic response (TER) and the rate of inbreeding (ΔF) per generation varied depending on the scenarios ALT I, II and III, P and the selection criteria. A selection index considering ALT III (Risk-rated EVs) in derivation of ΔG for individual traits, RH and TER, and ΔF would be appropriate and optimal in both WG and AG selection schemes. However, these responses were higher in the AG scheme compared to the WG selection scheme, and the ΔF more favourable with increase in the number of groups co-operating. Responses under mass selection were also comparable to BLUP with the same rate of inbreeding, restricted to an acceptable level of 0.01. These imply that an AG selection scheme under mass selection would be optimal and logical for implementation in the smallholder low-input goat production systems. However, a minimum of 14 co-operating farmer groups would be required to produce considerable levels of responses and at acceptable levels of inbreeding. |
| format | Journal Article |
| id | CGSpace33421 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| record_format | dspace |
| spelling | CGSpace334212025-06-13T04:20:12Z Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs Bett, R.C. Okeyo Mwai, Ally Kosgey, I.S. Kahi, A.K. Peters, Kurt J. goats animal breeding his study evaluated alternative breeding objectives and schemes for crossbred goats in a village/ community breeding program. A single-tier breeding structure was assumed in the optimisation of this breeding program. Considered were two selection schemes; within-group (WG) and across-groups (AG), and three alternative selection objectives; ALT I- defined based on relative weights (RWs) derived from producers’ preferences, ALT II- based on economic values (EVs) without risk and ALT III- based on risk-rated EVs, at different intensities of buck selection (proportion of bucks selected, P = 0.02 and 0.04) and selection criteria (mass and BLUP). The genetic gains (ΔG) in the breeding-objective traits, aggregate responses (RH), total economic response (TER) and the rate of inbreeding (ΔF) per generation varied depending on the scenarios ALT I, II and III, P and the selection criteria. A selection index considering ALT III (Risk-rated EVs) in derivation of ΔG for individual traits, RH and TER, and ΔF would be appropriate and optimal in both WG and AG selection schemes. However, these responses were higher in the AG scheme compared to the WG selection scheme, and the ΔF more favourable with increase in the number of groups co-operating. Responses under mass selection were also comparable to BLUP with the same rate of inbreeding, restricted to an acceptable level of 0.01. These imply that an AG selection scheme under mass selection would be optimal and logical for implementation in the smallholder low-input goat production systems. However, a minimum of 14 co-operating farmer groups would be required to produce considerable levels of responses and at acceptable levels of inbreeding. 2012 2013-07-31T16:38:44Z 2013-07-31T16:38:44Z Journal Article https://hdl.handle.net/10568/33421 en Open Access Bett, R.C., Okeyo, A.M., Kosgey, I.S., Kahi, A.K. and Peters, K.J. 2012. Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs. Livestock Research for Rural Development 24(1). |
| spellingShingle | goats animal breeding Bett, R.C. Okeyo Mwai, Ally Kosgey, I.S. Kahi, A.K. Peters, Kurt J. Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs |
| title | Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs |
| title_full | Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs |
| title_fullStr | Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs |
| title_full_unstemmed | Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs |
| title_short | Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs |
| title_sort | evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs |
| topic | goats animal breeding |
| url | https://hdl.handle.net/10568/33421 |
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