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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0503    [Accepted] Published online October 21, 2019.
Reduction of slaughter age of Hanwoo steers by early genotyping based on meat yield index
Chang Dae Jeong1  , Mahfuzul Islam1  , Jong-Joo Kim2  , Yong-Il Cho3  , Sang-Suk Lee1,* 
1Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, Sunchon National University, 413 Jungang-ro, Jeonnam 57922, Suncheon, Korea
2Department of Biotechnology, Yeungnam University, Gyeonbuk 38541, Gyeongsan, Korea
3Animal Disease and Diagnostic Laboratory, Department of Animal Science and Technology, Sunchon National University, 413 Jungang-ro, Jeonnam 57922, Suncheon, Korea
Correspondence:  Sang-Suk Lee, Tel: +82-61-750-3237, Fax: +82-61-750-3237, Email: rumen@sunchon.ac.kr
Received: 18 June 2019   • Revised: 23 August 2019   • Accepted: 3 October 2019
Abstract
Objective
This study was conducted to determine early hereditary endowment to establish a short-term feeding program.
Methods
Hanwoo steers (n=140) were equally distributed into four groups (35/group) based on genetic meat yield index (MYI) viz. the greatest, great, low, and the lowest at Jukam Hanwoo farm, Goheung. All animals were fed in group pens (5 animals/pen) with similar feed depending on the growth stage. Rice straw was provided ad libitum, whereas concentrate was fed at 5.71 kg during the growing period (6–13mo) and 9.4 kg during the fattening period (13–28mo). Body weight (BW) was measured at two-month intervals, whereas carcass weight was determined at slaughtering at about 31 months of age. The Affymetrix Bovine Axiom Array 640K single nucleotide polymorphism (SNP) chip was used to determine the meat quantity-related gene in the blood.
Results
After 6 months, the highest (p<0.05) BW was observed in the greatest MYI group (190.77 kg) and the lowest (p<0.05) in the lowest MYI groups (173.51 kg). The great MYI group also showed significantly (p<0.05) higher BW than the lowest MYI group. After 16 and 24 months, the greatest MYI group had the highest BWG (p<0.05) and were therefore slaughtered the earliest. Carcass weight was significantly (p<0.05) higher in the greatest and the great MYI groups followed by the low and the lowest MYI groups. Back-fat thickness in the greatest MYI group was highly correlated to carcass weight and marbling score. The SNP array analysis identified the carcass-weight related gene BTB-01280026 with an additive effect. The steers with the allele increasing carcass weight had heavier slaughter weight of about 12 kg.
Conclusion
Genetic MYI is a potential tool for calf selection, which will reduce the slaughter age while simultaneously increasing carcass weight, back-fat thickness, and marbling score.
Keywords: Body Weight; Carcass Weight; Genotyping; Growth Pattern; Meat Yield Index
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