|
KMID : 0359320110510010001
|
|
Korean Journal of Veterinary Research
2011 Volume.51 No. 1 p.1 ~ p.6
|
|
|
Efficacy test of sustained-release somatotropin by implantation in steer, cow and barrow
|
|
Kim Nam-Joong
|
|
|
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.
|
|
|
KEYWORD
|
|
|
feed:gain ratio, growth rate, implant, milk production, somatotropin, sustained-release
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|