| Efficacy test of sustained-release somatotropin by implantation in steer, cow and barrow |
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Nam Joong Kim |
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Companion animal science, Hyechon University |
| 비육우, 젖소 및 비육돈에서 이식형 소마토트로핀 지속성 제형의 유효성 시험 연구 |
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김남중 |
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혜천대학 애완동물과 |
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| Abstract |
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Sixteen steers were used to investigate the efficacy of the sustained-release implant of bovine somatotropin (bST) in improving growth and feed:gain ratio during 12 weeks. Administration of the 400 mg bST implant resulted in a 16.1% increase in growth rate, and this increase was significant (p<.05). The use of the sustained-release implant did not alter (p>.05) feed intake and feed:gain ratio. Thirty-four cows were used to investigate the efficacy of the sustained-release implant of bST in milk production during 4 weeks. Administration of the 200 mg bST implant resulted in an 8.7% increase in milk production, and this increase was significant (p<.05). Twenty-four barrows were used to investigate the efficacy of the sustained-release implant of porcine somatotropin (pST) in improving growth, feed:gain ratio and backfat thickness during 6 weeks. Administration of the 120 mg pST implant resulted in a 11.4% increase in feed:gain ratio and a 60% decrease in backfat thickness, and these results were significant (p<.05). But the use of the sustained-release implant did not alter (p>.05) growth rate and feed intake. |
| Key Words:
feed:gain ratio, growth rate, implant, milk production, somatotropin, sustained-release |
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