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Influence of genotype and sex on the response of growing pigs to recombinant porcine somatotropin

Influence of genotype and sex on the response of growing pigs to recombinant porcine somatotropin Abstract The dose-dependent effects of porcine somatotropin (pST) on growth performance and composition of carcass gain were investigated in 150 growing pigs. The experiment involved two genotypes (barrows from the Pig Improvement Company [PIC] and a University of Nebraska [NEB] gene pool line) and two sexes (PIC barrows and boars). At 30 kg, pigs were randomly assigned within each genotype and sex subclass to receive daily i.m. injections of 50, 100, 150, or 200 µg of pST/kg BW or an equivalent volume of an excipient. A diet (3.5 Meal of DE/kg) supplemented with crystalline amino acids and containing 22.5% CP was available on an ad libitum basis until pigs were slaughtered at approximately 90 kg live weight. Excipient-treated PIC barrows exhibited faster and more efficient growth (P < .001) and a higher capacity for carcass protein accretion (P <.001) but similar rates of lipid deposition compared to excipient-treated NEB barrows. Within the PIC genotype, control boars grew at a rate similar to that of barrows, but they were more efficient (P < .05) and deposited more carcass protein (P < .05) and less lipid (P < .001). Carcass protein accretion rate increased (P < .001) up to approximately 150 µg of pST-kg BW-1·d-1, whereas lipid deposition decreased (P < .001) with each incremental dose of pST. Although differences between PIC boars and barrows for all criteria were negated with increasing pST dose, they were maintained between the two genotypes. Polynomial regressions suggested that a slightly higher pST dose was required to optimize the feed:gain ratio compared with rate of gain and that the dose (micrograms per kilogram BW per day) was a function of the genotype and sex (feed:gain: 185, 170, and 155; rate of gain: 155, 155, and 125 for NEB barrows, PIC barrows, and PIC boars, respectively). This content is only available as a PDF. Author notes 2 The authors wish to thank S. Schwager and K. Yourstone for statistical assistance, T. Robinson, R. Tobin, and T. Kuntz for technical assistance, W. Frank, S. Kramer, and K. DeLorenzo for animal care, and P. Lawrence for secretarial assistance. The critical review of manuscript by D. Bauman is also greatly appreciated. 4 Pig Improvement Co., Inc., Franklin, KY 42135. 5 Indiana Packers Co., P. O. Box 318, Delphi, IN 46923. Copyright © 1992 by American Society of Animal Science http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Animal Science Oxford University Press

Influence of genotype and sex on the response of growing pigs to recombinant porcine somatotropin

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Copyright
Copyright © 1992 by American Society of Animal Science
ISSN
0021-8812
eISSN
1525-3163
DOI
10.2527/1992.70103024x
Publisher site
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Abstract

Abstract The dose-dependent effects of porcine somatotropin (pST) on growth performance and composition of carcass gain were investigated in 150 growing pigs. The experiment involved two genotypes (barrows from the Pig Improvement Company [PIC] and a University of Nebraska [NEB] gene pool line) and two sexes (PIC barrows and boars). At 30 kg, pigs were randomly assigned within each genotype and sex subclass to receive daily i.m. injections of 50, 100, 150, or 200 µg of pST/kg BW or an equivalent volume of an excipient. A diet (3.5 Meal of DE/kg) supplemented with crystalline amino acids and containing 22.5% CP was available on an ad libitum basis until pigs were slaughtered at approximately 90 kg live weight. Excipient-treated PIC barrows exhibited faster and more efficient growth (P < .001) and a higher capacity for carcass protein accretion (P <.001) but similar rates of lipid deposition compared to excipient-treated NEB barrows. Within the PIC genotype, control boars grew at a rate similar to that of barrows, but they were more efficient (P < .05) and deposited more carcass protein (P < .05) and less lipid (P < .001). Carcass protein accretion rate increased (P < .001) up to approximately 150 µg of pST-kg BW-1·d-1, whereas lipid deposition decreased (P < .001) with each incremental dose of pST. Although differences between PIC boars and barrows for all criteria were negated with increasing pST dose, they were maintained between the two genotypes. Polynomial regressions suggested that a slightly higher pST dose was required to optimize the feed:gain ratio compared with rate of gain and that the dose (micrograms per kilogram BW per day) was a function of the genotype and sex (feed:gain: 185, 170, and 155; rate of gain: 155, 155, and 125 for NEB barrows, PIC barrows, and PIC boars, respectively). This content is only available as a PDF. Author notes 2 The authors wish to thank S. Schwager and K. Yourstone for statistical assistance, T. Robinson, R. Tobin, and T. Kuntz for technical assistance, W. Frank, S. Kramer, and K. DeLorenzo for animal care, and P. Lawrence for secretarial assistance. The critical review of manuscript by D. Bauman is also greatly appreciated. 4 Pig Improvement Co., Inc., Franklin, KY 42135. 5 Indiana Packers Co., P. O. Box 318, Delphi, IN 46923. Copyright © 1992 by American Society of Animal Science

Journal

Journal of Animal Science – Oxford University Press

Published: Oct 1, 1992

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