Choi C.B.,Yeungnam University |
Jung K.K.,Moksan Hanwoo Research Institute |
Chung K.Y.,South Korean National Institute of Animal Science |
Yang B.S.,South Korean National Institute of Animal Science |
And 11 more authors.
Livestock Science | Year: 2013
Forty Hanwoo steers weighing 759.3±50.3. kg were used to evaluate the effects of treatment with zilpaterol hydrochloride (ZH) in terms of feedlot performance, carcass characteristics, and fatty acid composition. We hypothesized that treatment of ZH increases meat amount in long-fed Hanwoo steers. Animals were blocked by BW, and assigned to one of two treatments within each block. Five animals were housed and fed in each of 8 pens. All animals were weighed before and after ZH treatment. Total BW gain over the 23-d period was adjusted to d 0 by covariant analysis. Steers receiving ZH (1.6. g/h/d) exhibited significantly increased weight gain (P<0.05) over CON steers. Performance analysis showed that ZH had significant effects on total weight gained average daily gain (ADG). There were also treatment effects (P<0.05) on dressing percentage, LM area, and yield grade. The total percentage of lean muscle was increased by the administration of ZH, and the percentage of fat was decreased by ZH treatment (P<0.05). The weights of tenderloin, striploin, chuck, round, shank, and brisket were significantly increased by ZH treatment compared to CON steers (P<0.05). Analyses of the physico-chemical characteristics of the longissimus muscle indicated that shear force, purge loss, and cooking loss were increased with ZH treatment (P<0.05). However, there were no treatment effects on marbling score and fatty acid compositions (P>0.05). We conclude that the administration of ZH increased LM area and primal yield grades, but had no change in the fatty acid profile. © 2013 Elsevier B.V.
PubMed | Dong - A University, Korea University, Gyeonbuk Provincial College, Moksan Hanwoo Research Institute and Yeungnam University
Type: | Journal: Journal of animal science and technology | Year: 2015
This study was performed to investigate the effects of different forms of concentrate fed to Hanwoo steers on performance, carcass characteristics, and economic performance. Forty-two Hanwoo steers (average age of 5.10.8 mo. with body weight of 147.0510.85kg) were randomly allotted into FC (animals fed flakes for entire experimental period) and GC (animals fed grounded concentrate during growing and fattening phases followed by flaked concentrate during finishing phase) groups for 758 d after reaching an age of 30.00.82 mo. There was no difference in body weight (BW) or ADG between the treatments until fattening (15~22 mo.) phase. However, by finishing phase (23~30 mo.), the GC group (739.24kg BW and 0.67kg ADG) showed greater (P<0.05) BW and ADG than the FC group (702.93kg BW and 0.59kg ADG). Steers in the GC group also showed greater (P<0.05) BW and ADG than the FC group throughout the entire experimental period (5~30 mo.). There was no significant difference in carcass weight or backfat thickness between the treatments. M. Longissimus dorsi area of the GC group (91.00cm(2)cm(2)) was greater (P<0.05) than that of the FC group (83.59cm(2)). Marbling score and percentage of 1(++) meat quality grade were 14.0 and 48.0% higher in the GC group compared to the FC group. There was no significant difference in physicochemical characteristics, including moisture and crude protein levels, between the treatments. Gross income per head excluding operating expenses was 59.3% greater in the GC group (1,647,512 won) compared to the FC group (1,034,343 won).