Effect of nutrient intake on pigs treated with porcine somatotropin
Newcomb, Mark David
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Permalink
https://hdl.handle.net/2142/21176
Description
Title
Effect of nutrient intake on pigs treated with porcine somatotropin
Author(s)
Newcomb, Mark David
Issue Date
1990
Doctoral Committee Chair(s)
Easter, Robert A.
Department of Study
Animal Sciences
Discipline
Animal Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Animal Culture and Nutrition
Language
eng
Abstract
An experiment was conducted to develop a technique for hyperalimentation of growing swine and to evaluate the effect of hyperalimentation on feedlot performance and carcass criteria. To allow for infusion of feed into the stomach, a cannula was implanted. The implantation of a cannula into the greater curvature of the stomach was well tolerated by these animals. Hyperalimentation to 120% of the cannulated, ad libitum fed control animals depressed feed efficiency (gain:feed). Hyperalimentation did not affect protein growth of the carcass, but did tend to increase fat thickness measured at the 10th rib, last rib, last lumbar vertebrae, as well as the P2 site.
The demonstration that feed infused via a cannula is tolerated led to an experiment to evaluate the effect of hyperalimentation on the pig treated with porcine somatotropin (PST; 3 mg/d). Treatment with PST per se enhanced lean and depressed fat growth. Hyperalimentation of pigs treated with PST did not enhance further protein growth, but did increase fat deposition. Hyperalimentation to 120% of PST-treated cannulated control animals did not negatively affect feed efficiency as was demonstrated previously with non-PST-treated pigs. It may be inferred that the pig treated with PST can utilize feed in excess of the quantity voluntarily consumed, albeit, the primary use of this feed appears to be for fat deposition. This cannulation system may provide a model to evaluate nutrient relationships and perhaps to examine intake mechanism controls.
"An experiment was conducted to evaluate the response of pigs treated with PST or saline to graded levels of an ""ideal protein."" The amino acid profile used to achieve this ideal protein provided histidine, isoleucine, leucine, methionine and cysteine, phenylalanine and tyrosine, threonine, tryptophan, and valine as 33%, 50%, 110%, 63%, 119%, 72%, 19%, and 75%, of lysine respectively. The levels of ideal protein used were 14, 17, 20, 23, 26, and 29%. Neither saline- nor PST-treated pigs responded to incremental increases in ideal protein content of the diet for any criteria examined. Treatment with PST resulted in improved feed efficiency. This improved efficiency was incident to the increases in total body protein deposition as well as depressed fat deposition."
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