Effects of Dietary Fat Level of Concentrate Mix on Growth Performance, Rumen Characteristics, Digestibility, Blood Metabolites, and Methane Emission in Growing Hanwoo Steers

This study investigated the effect of different dietary fat levels in concentrate mixes on the growth performance, rumen characteristics, digestibility, blood metabolites, and methane emissions in growing Hanwoo steers. Thirty steers (386 ± 24.6 kg of body weight [BW]; 12 months old), blocked by BW,...

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Published in:Animals (Basel) 2023-12, Vol.14 (1), p.139
Main Authors: Cho, Hyunjin, Jeong, Sinyong, Kang, Kyewon, Lee, Mingyung, Jeon, Seoyoung, Kang, Hamin, Kim, Hanbeen, Seo, Jakyeom, Oh, Joonpyo, Seo, Seongwon
Format: Article
Language:English
Subjects:
Air quality management
Animals
Beef cattle
Biological products
concentrate mix
Costs (Law)
Dietary fat
Esters
Fatty acids
Feces
Feeds
Fermentation
Growth
Hanwoo
laser methane detector
Lasers
Metabolites
Methane
methane emission
Nitrogen
Oils & fats
Productivity
Proteins
Protozoa
Rumen
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Summary:This study investigated the effect of different dietary fat levels in concentrate mixes on the growth performance, rumen characteristics, digestibility, blood metabolites, and methane emissions in growing Hanwoo steers. Thirty steers (386 ± 24.6 kg of body weight [BW]; 12 months old), blocked by BW, were randomly assigned to three dietary treatments with varying fat concentrations in concentrate mix (48, 74, and 99 g of ether extract per kg dry matte [DM]). The fat intake of the low-fat treatment represented 4.15% of the total dry matter intake (DMI), while the medium- and high-fat treatments accounted for 5.77% and 7.23% of total DMI, respectively. Concentrate mix DMI decreased with increasing fat level ( < 0.01). The growth rate and digestibility did not significantly differ based on the fat level ( > 0.05). As the fat level increased, propionate in the total ruminal volatile fatty acids increased, and butyrate and acetate-to-propionate decreased ( < 0.01). Cholesterol in blood serum increased significantly with increasing dietary fat levels ( < 0.01). Methane emissions exhibited a linear decrease with increasing fat level ( < 0.05). In conclusion, elevating fat content in the concentrates up to 100 g/kg DM reduced methane emissions without compromising the growth performance of growing Hanwoo steers.
ISSN:2076-2615
2076-2615
DOI:10.3390/ani14010139