Animal Bioscience

  • 제37권9호
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  • Pages.1568-1580
  • /
  • 2024
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  • 2765-0189(pISSN)
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  • 2765-0235(eISSN)
아세아태평양축산학회 (Asian Australasian Association of Animal Production Societies)
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Repeatability of feed efficiency and its relationship with carcass traits in Hanwoo steers during their entire growing and fattening period

  • Hyunjin Cho (Division of Animal and Dairy Sciences, Chungnam National University) ;
  • Kyewon Kang (Division of Animal and Dairy Sciences, Chungnam National University) ;
  • Hamin Kang (Division of Animal and Dairy Sciences, Chungnam National University) ;
  • Seoyoung Jeon (Division of Animal and Dairy Sciences, Chungnam National University) ;
  • Mingyung Lee (Division of Animal and Dairy Sciences, Chungnam National University) ;
  • Eunkyu Park (Woosung Feed Co., Ltd.) ;
  • Seokman Hong (Woosung Feed Co., Ltd.) ;
  • Seongwon Seo (Division of Animal and Dairy Sciences, Chungnam National University)
  • 투고 : 2024.02.06
  • 심사 : 2024.03.05
  • 발행 : 2024.09.01
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초록

Objective: This study investigated the repeatability of feed efficiency and its association with carcass traits in Hanwoo steers during the entire growing and fattening periods. Methods: The growth and intake of thirty-six Hanwoo steers (259±19.7 kg; nine months) were monitored throughout five periods, including two growing periods (GP) and three fattening periods (FP). The steers were fed two types of concentrate mixes with varying nutrient compositions until they reached a target weight of 800 kg for slaughter. For each period, steers were categorized into three classes based on their feed efficiency rankings using residual feed intake (RFI) and feed conversion ratio (FCR). Feed efficiency repeatability was assessed using the Spearman correlation coefficient, decomposition of random errors, and the Theil segregation index (TSI). The Pearson correlation coefficient was used to examine the relationship between feed efficiency and carcass traits. Results: The results demonstrated a significant and high correlation with RFI, but not FCR, during the growing or fattening stages (r>0.5; p<0.01). When steers were classified according to their feed efficiency rankings, 58% of the animals in the high RFI class (low efficient) initially (GP 1) remained in the same class by the last period (FP 3), whereas steers were randomly distributed based on FCR. The repeatability, assessed by the decomposition of random errors, was higher for RFI (0.61) than for FCR (0.15). The TSI also indicated that RFI rankings, rather than FCR rankings, are more likely to be maintained. Moreover, a weak association was observed between feed efficiency and carcass traits. Conclusion: In conclusion, RFI repeatability throughout the GP and FP surpassed that of the FCR, with steers classified as high RFI during the GP more likely to remain in the same class during the FP. Feed efficiency was weakly correlated with carcass traits.

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과제정보

This work was supported by Chungnam National University.

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