Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Dietary effects of protected fat, glycerol, and soybean meal on performance, physiological parameters, carcass characteristics, and behavioral measurements of late-fattening Hanwoo steers under heat stress conditions

  • Jun Sik Woo (Department of Animal Science and Technology, Konkuk University) ;
  • Gyeong Rim Ryu (National Institute of Animal Science, Rural Development Administration) ;
  • Jeong Hoon Kim (Cargill Agri Purina Inc.) ;
  • Sun Sik Jang (National Institute of Animal Science, Rural Development Administration) ;
  • Hong Gu Lee (Department of Animal Science and Technology, Konkuk University) ;
  • Keun Kyu Park (Department of Animal Science and Technology, Konkuk University)
  • Received : 2023.11.26
  • Accepted : 2024.02.18
  • Published : 2024.07.01
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Abstract

Objective: This study aimed to determine the effects of increasing energy and protein levels in diets by including protected fat (PF), glycerol (GL), and soybean meal (SBM) on growth performance, physiological parameters, carcass characteristics, and behavioral measurements of late-fattening Hanwoo steers under heat stress conditions. Methods: Thirty-six steers (initial body weight, 724.9±58.3 kg; age, 25.5±0.4 month) were assigned into control (total digestible nutrient [TDN] 76%, crude protein [CP] 15%), PF (TDN 83.6%, CP 15%), PF+GL (TDN 83.6%, CP 15%) and PF+GL+SBM (TDN 83.6%, CP 16.5%) by randomized complete block design for a total of 16 weeks with division of 4-week periods. The average temperature-humidity index was 87.0 (1st period; severe), 82.8 (2nd; moderate), 71.4 (3rd; comfort), and 68.1 (4th; comfort). Results: The dry matter intake (DMI) showed no treatments differences during the whole experiment. However, DMI in 1st and 2nd period decreased by approximately 30% and 10% compared to 4th period, respectively. Higher average daily gain and feed conversion ratio were noted for treatments compared to control at both 1st and 2nd period (p<0.05). There were no treatment effects on rectal temperature (RT), cortisol, and behaviors during the entire experiment. However, both RT and cortisol in 0, 1st and 2nd period were higher than those of 3rd and 4th period (p<0.05). Carcass yield and grade remained unaffected by increasing TDN and CP levels. Behavioral changes in the hot season (1st period) included reduced lying (43%), increased standing (48%), decreased walking (62%), and decreased eating (38%) (p<0.05), with an increase in drinking by 54%. Rumination during standing was 53% higher, while rumination during lying was about 33% lower compared to the post-hot season (3rd period) (p<0.05). Conclusion: Dietary supplementation of protected fat in late-fattening Hanwoo steers under heat stress had a positive effect on preventing a reduction in performance.

Keywords

Acknowledgement

This study was supported by 'Cooperative Research Program for Agriculture Science & Technology Development (Project No. RS-2020-RD009280)' Rural Development Administration, Republic of Korea.

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