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genetic parameter estimates for growth traits at early stage of Pacific abalone,Haliotis discus hannai Ino

Acta Oceanologica Sinica 2007年第5期26卷 90-95页

作者： DENG Yuewen LIU Xiao ZHANG Guofan ZHAO Hongen Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Fisheries College Guangdong Ocean University Zhanjiang 524025 China Dalian Institute of Fisheries Dalian 116013 China

Heritability and genetic and phenotypic correlations were estimated for juvenile growth traits of Pacific abalone Haliotis discus hannai Ino. The estimates were calculated from shell length and shell width measurements on progeny resulting from 12 half-sib families and 36 full-sib families obtained using artificial fertilization of mating three females to each male. The measurements were taken at 10, 20 and 30 d after fertilization. It was found that heritability estimates based on sire component ranged from 0.23 to 0.36 for shell length and 0.21 to 0.32 for shell width. Heritability estimates from dam component were larger than those from sire component at three ages, indicating presence of maternal effects, non-additive genetic effects and common environmental effects. Phenotypic correlations were significant at three ages （P 〈 0.05）, with values of 0.92, 0.93 and 0.92, respectively. genetic correlations from the paternal half-sib correlation analysis were highly positive at three ages, with values of 0.50, 0.78 and 0.81, respectively. The results suggest that selective breeding is an effective approach to improving growth traits of Pacific abalone stocks.

关键词： Haliotis discus hannai Ino growth traits heritability genetic correlations

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Heritability and genetic Correlation of Niamey’s Local Chicken Growth (Niger)

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Open Journal of genetics 2022年第4期12卷 57-68页

作者： Adamou Guisso Taffa Salissou Issa Chaibou Mahamadou Nassim Moula Johann Detilleux Department of Animal Production Agronomy Faculty Abdou Moumouni University of Niamey Niamey Niger Department of Animal Production National Institute for Agronomic Research of Niger Niamey Niger GIGA Animal Facilities University of Liege Liege Belgium Department of Veterinary Management of Animal Resources Faculty of Veterinary Medicine University of Liege Liege Belgium Department of Equine Clinical Sciences Faculty of Veterinary Medicine University of Liege Liege Belgium

The exploitation of industrial strains of chickens in the Sahelian climate of Niger is characterized by a decline in performance and significant costs associated with their maintenance. In contrast, local chickens are well adapted to these environmental conditions but with poor production performance. genetic selection of these local chickens could improve their productivity. The first step is to determine if the genetic parameters of their growth are high enough to ensure a successful selection strategy. To do so, weekly weights of 69 parents and 119 offspring were followed for 20 weeks. The heritability and genetic correlations of these weights were estimated through the Bayesian approach using the MCMCglmm package on R software. At hatching, weights ranged from 23 to 25 g. At 20 weeks, these weights ranged from 1031 to 1052 g for females and 1308 to 1445 g for males. Heritabilities for hatch weights at 4, 8, 12, 16, and 20 weeks of age were estimated to be 0.56, 0.31, 0.52, 0.53, 0.52 and 0.48 respectively and all genetic correlations were positive. In particular, weight at 8 weeks of age showed both good heritability (h2 = 0.52) and strong, positive genetic correlations with weights at older ages. These results indicate that genetic selection to improve weight at 8 weeks of age would be a good strategy to improve the overall growth performance of these chickens.

关键词： Bayesian genetic correlations Heritability Local Chicken MCMCglmm Weight Gain Niger

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