Author
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Rosebrough, Robert |
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Submitted to: Poultry Science Association Meeting Abstract
Publication Type: Abstract Only Publication Acceptance Date: 8/2/1998 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Turkey poults growing from 7 to 28 d were fed diets containing 180, 240 and 300 g protein/kg to determine dietary effects on intermediary metabolism. All diets contained 58% of the total energy as carbohydrate so that effects could be attributed solely to protein content. In vitro lipogenesis (IVL) was determined by incubating liver explants for 2 hr at 37 C in Hanks salts scontaining 25 mM HEPES and 10 mM [2-14C]acetate and by measuring acetate incorporation into total lipid. Isocitrate dehydrogenase; (ICD), malic enzyme (ME), and aspartate aminotransferase (AAT) were also determined. The highest level of crude protein resulted in the greatest weight gain and feed consumption. In vitro lipogenesis and ME activity were inversely related to dietary crude protein levels. In contrast, increasing dietary crude protein increased the activities of both AAT and ICD. Values for plasma triglycerides were higher and uric acids were lower when lower levels of crude protein are fed to the modern turkey. Both parameters can be taken as valid indicators of changes in body fat and protein stores, respectively. Results of the present study demonstrate a continued, though accentuated, role for protein in the regulation of metabolism in the turkey. Results also indicate that selection practices over the last 15 yr. have resulted in improved growth rates and increased lipid synthetic potential. |
