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Effects of a synthetic growth hormone-releasing peptide on growth and carcass traits of pigs

Published online by Cambridge University Press:  01 May 1999

I.-L. SHIH ,
H. TSAI ,
W.-J. JIANG ,
Y.-T. HUANG  and
T.-J. KOH
I.-L. SHIH
Affiliation:
Department of Environmental Engineering, Da-Yeh University, 112 Shan-Juau Rd., Da-Tsuen, Changhua, Taiwan, R.O.C. Development Center for Biotechnology, 81 Chang Hsing Street, Taipei, Taiwan, R.O.C.
H. TSAI
Affiliation:
Development Center for Biotechnology, 81 Chang Hsing Street, Taipei, Taiwan, R.O.C.
W.-J. JIANG
Affiliation:
Development Center for Biotechnology, 81 Chang Hsing Street, Taipei, Taiwan, R.O.C.
Y.-T. HUANG
Affiliation:
Department of Animal Breeding, Animal Industry Research Institute, Taiwan Sugar Corporation, Chunan Miaoli, Taiwan, R.O.C.
T.-J. KOH
Affiliation:
Department of Animal Breeding, Animal Industry Research Institute, Taiwan Sugar Corporation, Chunan Miaoli, Taiwan, R.O.C.
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Abstract

The current study was to determine the effects of growth hormone-releasing peptide ([His1, Lys6]-GHRP) on growth performance and carcass traits in pigs, and to determine whether the results were comparable to those of recombinant porcine growth hormone (r-PGH) treatment. Thirty Landrace and Yorkshire pigs (40–45 kg) were randomly divided into three groups, each group consisted of two boars, five gilts and three barrows. Peptides were administered daily by intramuscular injection with the following schemes and dosages: Group A ([His1, Lys6]-GHRP, 200 μg/day in 0·5 ml saline), Group B (r-PGH, 3 mg/day in 0·6 ml saline), and Group C (sterilized physiological saline, 0·5 ml/day). [His1, Lys6]-GHRP caused significant improvements both in pig growth and carcass traits. The average daily gain (ADG) and feed efficiency of the [His1, Lys6]-GHRP treated group were higher than those of the control, but less than with the r-PGH treatment. The net increase in the ADG by [His1, Lys6]-GHRP was c. 14%, and was 23% by r-PGH (both P<0·01). The feed efficiency was improved 17% by [His1, Lys6]-GHRP (P<0·01) and 20% by r-PGH (P<0·01). On the other hand, the back-fat thickness in both [His1, Lys6]-GHRP and r-PGH treated groups (1·76±0·041 cm and 1·72±0·040 cm, respectively) was considerably less (P<0·05) than that of the control group (1·81±0·040 cm). In addition, the lean cuts percentage and the rib longissimus muscle area were comparable in the [His1, Lys6]-GHRP and r-PGH treatments (lean cuts percentage: 57±2·0% and 57±1·5%, respectively; rib longissimus muscle area: 32·8±0·91 cm2 and 32·9±1·10 cm2, respectively), and both were significantly (P<0·05) greater than those of the control group (lean cuts percentage: 53±1·5%; rib longissimus muscle area: 28·3±1·61 cm2). In conclusion, [His1, Lys6]-GHRP appeared to be a promising tool for controlling carcass fat in pigs.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 132 , Issue 3 , May 1999 , pp. 347 - 350
Copyright
© 1999 Cambridge University Press

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