Effects of feeding high-energy diet on growth performance, blood parameters, and carcass traits in Hanwoo steers

Kang, D.H.; Chung, K.Y.; Park, B.H.; Kim, U.H.; Jang, S.S.; Smith, Z.K.; Kim, J.

Animal Bioscience 35(10): 1545-1555

2022


ISSN/ISBN: 2765-0189
PMID: 35507848
Accession: 079898603

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Abstract
Our study aimed to investigate the effects of a 2% increase in dietary TDN value during the growing (7-12 mo of age) and fattening (13-30 mo of age) period of Hanwoo steers. Two hundred and twenty Hanwoo steers were assigned to one of two treatments: 1) a control group (basal TDN, BTDN, n= 111 steers, growing =70.5%, early fattening = 71.0%, late fattening = 74.0%) or high TDN (HTDN, n = 109 steers, growing =72.6%, early = 73.1%, late = 76.2%). Growth performance, carcass traits, blood parameters, and gene expression of longissimus dorsi (7, 18, and 30 mo) were quantified. Steers on the BTDN diets had increased (P ≤ 0.02) DMI throughout the feeding trial compared to HTDN, but gain did not differ appreciably. A greater proportion of cattle in HTDN received Korean quality grade 1 (82%) or greater compared to BTDN (77%), while HTDN had a greater yield grade (29%) than BTDN (20%). Redness (a*) of LD muscle was improved (P = 0.021) in steers fed HTDN. Feeding the HTDN diet did not alter blood parameters. Steers fed HTDN diet increased (P = 0.015) the proportion of stearic acid and tendened to alter linoleic acid. Overall, SFA, UFA, MUFA, and PUFA of LD muscle were not impacted by the HTDN treatment. A treatment by age interaction was noted for mRNA expression of MHC IIA, IIX, and SCD (P ≤ 0.026). No treatment effect was detected on gene expression from LD muscle biopsies at 7, 18, and 30 mo of age; however, an age effect was detected for all variables measured (P ≤ 0.001). Our results indicated that feeding HTDN diet could improve overall quality grade while minimum effects were noted in gene expression, blood parameters, and growing performance. Cattle performance prediction in the feedlot is a critical decision-making tool for optimal planning of cattle fattening and these data provide both benchmark physiological parameters and growth performance measures for Hanwoo cattle feeding enterprises.