sustainable long-term conservation of rare cattle breeds using rotational ai sires可持续的长期保护珍稀牛品种使用旋转ai雄.pdf

Genet. Sel. Evol. 40 (2008) 415–432 Available online at: INRA, EDP Sciences, 2008 DOI: 10.1051/gse:2008011 Original article Sustainable long-term conservation of rare cattle breeds using rotational AI sires Jean-Jacques COLLEAU 1*, Laurent AVON2 1INRA, UR337 Station de ge´ne´tique quantitative et applique´e, 78352 Jouy-en-Josas Cedex, France 2Institut de l’e´levage, De´partement Ge´ne´tique, 149 Rue de Bercy, 75595 Paris Cedex 12, France (Received 21 September 2007; accepted 30 January 2008) Abstract – The development of inbreeding in rotation breeding schemes, sequentially using artificial insemination (AI) sires over generations, was investigated for a full AI scheme. Asymptotic prediction formulae of inbreeding coefficients were established when the first rotation list of AI sires (possibly related) was in use. Simulated annealing provided the optimal rotation order of sires within this list, when the sires were related. These methods were also used for subsequent rotation lists, needed by the exhaustion of semen stores for the first bulls. Simulation was carried out starting with groups of independent sires, with different sizes. To generate a yearly inbreeding rate substantially lower than 0.05% (considered to be within reach by conventional conservation schemes using frequent replacements), the results obtained showed that the number of sires should be at least 10–15 and that the same sires should be used during at least 50 years. The ultimate objective was to examine the relevance of implementing rotation in breeding schemes on the actual rare Fr