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Heterosis and combining ability evaluation for growth traits of blunt snout bream (Megalobrama amblycephala) when crossbreeding three strains
Version 2 2024-06-03, 00:20Version 2 2024-06-03, 00:20
Version 1 2023-11-06, 01:01Version 1 2023-11-06, 01:01
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posted on 2023-11-06, 01:01 authored by W Luo, C Zeng, S Yi, N Robinson, W Wang, Z GaoThe blunt snout bream (Megalobrama amblycephala) is a major aquaculture species in the Chinese freshwater polyculture system. In this study, complete diallel crossing of three strains (i.e., Liangzi [LZ], Poyang [PY] and Yuni [YN]) was used to evaluate the combining ability and heterosis effect of intraspecific crossbreeding on the growth performance (i.e., body weight, total length, body length, body height, and Fulton's coefficient of condition). The offspring produced from the three strains were reared in a communal pond for 20 months, and nine microsatellites were used to assess their pedigree. Of the 749 offspring, 708 (94.53 %) could be assigned directly to a single parental pair. Significant differences were observed in body weight (BW) among the different combinations, indicating that the combining ability of BW from each strain was significantly different. The general combining ability (GCA) of BW from the sire was much higher than that from the dam. The GCA for the dam and sire of the LZ and YN were the largest and the smallest, respectively. The special combining ability of YN♀ × PY♂ was the largest, and YN♀ × PY♂ showed significantly positive heterosis effects on all F1 growth traits, except for Fulton's condition coefficient (K) (P < 0.05). In addition, significant positive linear correlations were found between the mean BW of corresponding progeny and the H E of the parental generation (y = 600.7x - 29.472, r = 0.8651, P = 0.0026), H O (y = 1206.9x - 518.14, r = 0.7436, P = 0.0216), and the polymorphism information content (y = 1021.3x - 331.31, r = 0.8245, P = 0.0063) as determined by a correlative test. The findings obtained from the study will be important for future considerations of M. amblycephala stock improvement programs. © 2014 Science China Press and Springer-Verlag Berlin Heidelberg.
History
Journal
Chinese Science BulletinVolume
59Pagination
857-864Publisher DOI
ISSN
1001-6538eISSN
1861-9541Language
EnglishIssue
9Publisher
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