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Effect of recombinant bovine somatotropin on growth performance and carcass characteristics of finishing Korean native bulls |
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B. O. Kwak, J. K. Ha, B. S. Chang |
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| Abstract |
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This experiment was conducted to investigate the effect of bST administration on growth performance and carcass characteristics of finishing Korean native bulls. Fifty four Korean native bulls of about 14 months of age weighting an average 420 kg were assigned to receive no injection of bST, 250 mg of bST s.c. injection every week, or 500 mg bST s.c. injection every 2 weeks(Control, 250ST, 500ST) in a 3 횞 3 randomized block design for a period of 20 weeks Animals administered with bST responded with decreased feed DMI by 8%(p<0.01), increased ADG by 12%(p<0.05), and increased gain/feed ratio by 20%(p<0.01). But there was no significant difference in the growth performance between 250ST and 500ST. Administration of bST increased dressing percentage by 1.8%(p<0.05), and tended to increase longissimus muscle area and decrease backfat thickness and marbling score. |
| Keywords:
bST; Growth; Carcass; Korean Native Bulls |
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