Some optimum age structures and selection methods in open nucleus breeding schemes with overlapping generations

Hopkins, I. R.

doi:10.1017/s0003356100040861

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…This is also found in other literature references regarding meat and wool sheep (Jackson and Turner, 1972;Hopkins, 1978). The nucleus displays the advantage of the standardized environmental conditions which allow the increase in the accuracy of the estimation of the breeding values of breeding animals.…”

Section: Discussionsupporting

confidence: 61%

Evaluation of the efficiency of alternative selection schemes and breeding objectives in dairy sheep of Greece

et al. 1997

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The genetic and economic efficiency of alternative selection schemes and breeding objectives for the Karagouniki dairy sheep in Greece was investigated by model calculations. Criteria of efficiency were the annual genetic gain for the aggregate breeding value, the profit per ewe in the population and the annual selection responses for single traits. The introduction of a two-tier selection scheme, where the recorded ewes are separated into a nucleus and a pre-nucleus, was found superior in both genetic and economic terms for a breeding objective comprising the traits milk yield and number of lambs weaned per ewe per annum. Highest rates for annual genetic gain and selection responses were obtained when the nucleus size was proportionately 0-05 of the population (200 000 ewes), the size of the test matings 0-50 to 0-60 of the size of the pre-nucleus unit (0-10 of the population) and the number of daughters per test ram 40. Opening the nucleus to replacement ewes from the lower tier did not affect positively the annual genetic gain and the selection responses. Furthermore, a breeding objective comprising the traits fat yield and number of lambs weaned per ewe and per annum was found very efficient in both genetic and economic terms while selection on growth and carcass traits did not seem to be justified.

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Section: Discussionsupporting

confidence: 61%

Evaluation of the efficiency of alternative selection schemes and breeding objectives in dairy sheep of Greece

et al. 1997

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“…Hopkins (1978) emphasized that using more efficient selection strategies and short generation lengths in the nucleus would increase rates of gain.…”

Section: Proportion Of All Males Born Used As Sires (A)mentioning

confidence: 99%

Genetic gain in open nucleus breeding scheme to improve milk production in Egyptian Buffalo

et al. 2010

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“…Applying ONBS for many generations of selection could accelerate the rate of genetic gain of milk production in buffalo and increase the average milk yield by 15% in G1 to 26% in G4. Hopkins (1978) emphasized that using more efficient selection strategi es and short generation lengths in the nucleus would increase rates of gain. A more straightforward process for creating and distributing breeding stock with known value is provided by the open nucleus breeding plan.…”

Section: Open Herd Nucleus For Large and Small Ruminantsmentioning

confidence: 99%

Cattle Genetic Improvement Strategies for Sustainable Development in Tropics: Review

TESEMA

2023

BUASVMCN-ASB

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Inefficient use of genetic variation among and within breeds of different breeds is an obstacle to enhancing the livestock population in underdeveloped countries. The best productive and adaptable animals for each environment must be identified for breeding objectives. Changing numerous aspects of production is required for successful livestock genetic improvement. In developing countries, genetic improvement efforts are unlikely to succeed unless they are supplemented by better diet, herd health, and management. Improvement strategies that are now taken for granted in developed countries are not implemented in most developing countries. The high expense of such procedures is one of the main reasons for their poor adoption rates. As a result, the economic evaluation of improvement programs is critical. Population increase, market development, technological change, and a shifting resource base are all examples. These dynamics that drive a specific livestock production system, as well as the entire subsector, must be anticipated and identified in development strategies. It is vital to understand the direction and speed with which these elements may change, both at the sectoral and farm levels, for future initiatives to respond appropriately. As a result, improving local cattle genetic value and devising genetic improvement methods accordingly is critical for the country's and sector's long-term development. Insufficient research has negative impacts on different breed types in diverse and dynamic livestock production systems assessment in developing countries, which creates significant knowledge gaps about breed-change interventions. Hence, supporting researchers, research institutions and higher education institutions is crucial to the success of policy in reducing the knowledge gap and strengthening the relationships between the livestock owners and government. Moreover, the development of national livestock strategies, effective policies, and the establishment of breeding cooperatives have an impact on the development and implementation of national livestock strategies for sustainable development.

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Some optimum age structures and selection methods in open nucleus breeding schemes with overlapping generations

Cited by 11 publications

References 3 publications

Evaluation of the efficiency of alternative selection schemes and breeding objectives in dairy sheep of Greece

Evaluation of the efficiency of alternative selection schemes and breeding objectives in dairy sheep of Greece

Genetic gain in open nucleus breeding scheme to improve milk production in Egyptian Buffalo

Cattle Genetic Improvement Strategies for Sustainable Development in Tropics: Review

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