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http://dx.doi.org/10.5352/JLS.2012.22.2.161

Effects of Different Additives on the Growth Performance and Carcass Characteristics of Holstein Steers  

Cho, Won-Mo (National Institute of Animal Science, RDA)
Yang, Sung-Hak (National Institute of Animal Science, RDA)
Lee, Sang-Min (National Institute of Animal Science, RDA)
Jang, Sun-Sik (National Institute of Animal Science, RDA)
Kim, Hyeong-Cheol (National Institute of Animal Science, RDA)
Hong, Seong-Koo (National Institute of Animal Science, RDA)
Park, Woon-Yeoul (Samyang corporation)
Kim, Hyun-Soo (Sine-Bio corporation)
Publication Information
Journal of Life Science / v.22, no.2, 2012 , pp. 161-166 More about this Journal
Abstract
This study was performed to investigate the feeding effects of different additives on the growth performance and carcass characteristics of Holstein steers. Twenty-four Holstein steers, five months of age and 176.6 kg, were randomly allocated to three experimental groups of eight animals each for an 18-month feeding trial. The groups were control (not additive), T1 (fed zinc, vitamin C, and sulfur), and T2 (fed choline and lysine). The average daily gain was no different between the treatment groups during the growing to early fattening period, but it was significantly higher in the T1 group than the T2 group in the late fattening period (p<0.05). The final BW of the T1 group was relatively high in relation to the other groups, but was not significantly different. The additives had no effects on DMI during the experimental period; however, the feed conversion ratio of the T1 group in the late fattening period was significantly lower than that of the T2 group (p<0.05). The results of yield traits, carcass weight, and yield index were similar between groups, but back fat thickness and rib eye area were relatively lower in the T2 group than in the other groups. In terms of quality traits, meat color, texture, and maturity were not significantly different between the three groups. However, marbling score and appearance rate of high quality grade ($1^{++}$, $1^+$, and 1) were higher in the T1 group compared with the T2 group. Thus, the present results suggest that vitamin C, zinc, and sulfur supplementation may improve the growth performance and carcass characteristics of Holstein steers.
Keywords
Growth performance; carcass characteristics; Holstein steers; additives;
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