Efficacy test of sustained-release somatotropin by implantation in steer, cow and barrow.
- Author:
Nam Joong KIM
1
Author Information
1. Companion animal science, Hyechon University, Daejeon 302-715, Korea. njkim@hu.ac.kr
- Publication Type:Original Article
- Keywords:
feed:gain ratio;
growth rate;
implant;
milk production;
somatotropin;
sustained-release
- MeSH:
Growth Hormone;
Milk
- From:Korean Journal of Veterinary Research
2011;51(1):1-6
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
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.
