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Interrelationships Between Energy Intake and Endogenous Porcine Growth Hormone Administration on the Performance, Body Composition and Protein and Energy Metabolism of Growing Pigs Weighing 25 to 55 Kilograms Live Weight

U.S. Department of Agriculture^,4,5,, Beltsville, MD 20705

Abstract

Thirty-six barrows were used in a 2 x 3 factorial experiment to investigate the effects of porcine growth hormone (pGH) administration (USDA-pGH-B1; 0 and 100 µg·kg body weight^–1·d^–1) and three levels of feeding of a single diet (EI; ad libitum, 1.64 and 1.38 kg/d) on the performance, body composition and rates of protein and fat deposition of pigs growing over the live weight phase 25 to 55 kg. Raising EI resulted in linear increases in growth rate and in protein and fat accretion but had no effect on the feed to gain ratio (F/G). Carcass fat content and carcass fat measurements also increased with EI, whereas carcass protein and water decreased (P < .01). Growth hormone administration resulted in improvements in growth rate (16 to 26%), F/G (23%), protein deposition (34 to 50%) and increases in carcass protein and water at each level of feeding, but reduced ad libitum feed intake (P < .01), carcass fat content (P < .01) and carcass fat measurements (P < .01). Estimated maintenance energy expenditure was increased by pGH administration (2.02 vs 1.72 Mcal digestible energy/d). Results indicate that the effects of pGH on growth performance and energy and protein metabolism were largely independent of, and additive to, the effects of energy intake.

¹ Anim. Res. Inst., Werribee, Victoria 3030, Australia.

² USDA, Agric. Res. Serv., Beltsville Agric. Res. Center, Anim. Sci. Inst., Nonruminant Anim. Nutrition Lab.

³ Meat Sci. Res. Lab., Beltsville, MD.

⁴ Special appreciation is extended to Dr. Douglas J. Bolt, Reprod. Lab., Anim. Sci. Inst., Beltsville, MD for his assistance in obtaining pituitary-derived porcine growth hormone and Susan Blanchard for statistical analyses. The authors acknowledge the excellent technical assistance of Donna M. Brocht, Mary Von Vleck, Nancy Faulkner and Ernest Brown.

⁵ Mention of a trade name, proprietary product or vendor does not constitute a guarantee or warranty of the product by USDA or imply its approval to the exclusion of other products or vendors that also may be suitable.

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