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        Genetic parameters and correlations of related feed efficiency, growth, and carcass traits in Hanwoo beef cattle

        Mehrban, Hossein,Naserkheil, Masoumeh,Lee, Deuk Hwan,Ibanez-Escriche, Noelia Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.5

        Objective: This study aimed to estimate the genetic parameters and genetic correlations for related feed efficiency, growth, and carcass traits in Hanwoo cattle. Methods: Phenotypic data from 15,279 animals born between 1989 and 2015 were considered. The related feed efficiency traits considered were Kleiber ratio (KR) and relative growth rate (RGR). Carcass traits analyzed were backfat thickness (BT), carcass weight, eye muscle area, and marbling score. Growth traits were assessed by the average daily gain (ADG), metabolic body weight (MBW) at mid-test age from 6 to 24 months, and yearling weight (YW). Variance and covariance components were estimated using restricted maximum likelihood using nine multi-trait animal models. Results: The heritability estimates for related feed efficiency (0.28±0.04 for KR and RGR) and growth traits (0.26±0.02 to 0.33±0.04) were moderate, but the carcass traits tended to be higher (0.38±0.04 to 0.61±0.06). The related feed efficiency traits were positively genetically correlated with all the carcass traits (0.37±0.09 to 0.47±0.07 for KR, and 0.14±0.09 to 0.37±0.09 for RGR), except for BT, which showed null to weak correlation. Conversely, the genetic correlations of RGR with MBW (-0.36±0.08) and YW (-0.30±0.08) were negative, and those of KR with MBW and YW were close to zero, whereas the genetic correlations of ADG with RGR (0.40±0.08) and KR (0.70±0.05) were positive and relatively moderate to high. The genetic (0.92±0.02) correlations between KR and RGR were very high. Conclusion: Sufficient genetic variability and heritability were observed for traits of interest. Moreover, the inclusion of KR and/or RGR in Hanwoo cattle breeding programs could improve the feed efficiency without producing any unfavorable effects on the carcass traits.

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        Establishing an efficient in vitro propagation system for sweet cherry rootstocks Gisela 12 and Maxma 14 and assessment of genetic homogeneity by ISSR markers

        Ali Mehrban Jafarlou,Saeed Piri Pirivatlo,Behrouz Salehi,Amir Hoshang Hoseynzadeh Mogbli 한국작물학회 2021 Journal of crop science and biotechnology Vol.24 No.4

        This survey is aimed at the assessment of the possible efect of diferent plant growth regulators (PGRs) on the micropropagation of commercial sweet cherry rootstocks Gisela 12 (Prunus cerasus×Prunus canescens), and Maxma 14 (Prunus avium×Prunus mahaleb). To study Gisela 12 and Maxma 14 micropropagation were assessed utilizing lateral buds. The treatments used for the establishment and shoots proliferation included MS medium fortifed by benzyl amino purine (BAP) (0.0, 0.5, 1.0, 1.5 and 2.0 mg L−1) and indol-3-butyric acid (IBA) (0, 0.25, 0.50 and 1.0 mg L−1). For rooting, IBA was used at four levels (0.0, 0.25, 0.50, and 1.0 mg L−1) in combination with 0.0, 0.25, and 0.50 mg L−1 naphthaleneacetic acid (NAA) in full and half-strength MS media. Maximum shoot multiplication for Gisela 12 (6.2 shoots/explants) and Maxma 14 (4.4 shoots/explants) were observed on MS medium reinforced with 2.0 mg L−1 BAP with 0.25 mg L−1 IBA. The best rooting response of Gisela 12 (100%) and Maxma 14 (88.88%) was also achieved on half-strength MS including 1.0 mg L−1 IBA plus 0.25 NAA and 0.5 IBA plus 0.25 NAA, respectively. The ISSR banding profle showed the genetic stability of propagated plants along with the mother plant. This is the frst study evaluating the use of molecular markers for genetic uniformity test, which can be applied for large-scale propagation.

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