Effects of casein and soy protein isolate on protein turnover in growing pigs fed on a constant energy supply

E. Saggau; R. Schadereit; M. Beyer; A. Susenbeth; J. Voigt; H. Hagemeister

Effects of casein and soy protein isolate on protein turnover in growing pigs fed on a constant energy supply

于Energy metabolism in animals

著者：

E. Saggau

E. Saggau Research Institute for the Biology of Farm Animals Dummerstorf-Rostock, Department of Nutritional Physiology „Oskar Kellner”, Germany

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R. Schadereit

R. Schadereit Research Institute for the Biology of Farm Animals Dummerstorf-Rostock, Department of Nutritional Physiology „Oskar Kellner”, Germany

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M. Beyer

M. Beyer Research Institute for the Biology of Farm Animals Dummerstorf-Rostock, Department of Nutritional Physiology „Oskar Kellner”, Germany

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A. Susenbeth

A. Susenbeth Institute of Animal Nutrition, Physiology and Metabolism, Christian-Albrechts University Kiel, Germany

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J. Voigt

J. Voigt Research Institute for the Biology of Farm Animals Dummerstorf-Rostock, Department of Nutritional Physiology „Oskar Kellner”, Germany

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, and

H. Hagemeister

H. Hagemeister Research Institute for the Biology of Farm Animals Dummerstorf-Rostock, Department of Nutritional Physiology „Oskar Kellner”, Germany

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类型:: 章节

Page Range:: 297–300

DOI:: https://doi.org/10.1163/9789004683600_073

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Summary

To estimate long term effects of dietary protein quality (AA pattern) on whole-body protein synthesis and degradation in growing pigs, two experiments were carried out each using 4 growing barrows (40 to 90 kg body weight (BW)) per treatment group, which were fed semisynthetic, isoenergetic diets based on either casein or soy protein isolate at 1875 kJ ME/(kg (BW)^0,62 x d). Casein was tested with (CAS+) and soy protein isolate was tested with (SPI+) and without (SPI-) amino acid (AA) supplementation respectively. The effects of dietary protein quality were studied at the recommended protein supply of 100% (normal protein level (NP), experiment 1) and at a protein supply of 50% of NP (low protein level (LP), experiment 2). During the experiments pigs were housed individually in metabolic cages. Protein deposition was determined by the nitrogen balance method during 7 days. The whole-body protein synthesis was derived from the cumulative urinary ¹⁵N excretion up to 48 hours after application of a single dose of [¹⁵N]glycine. Calculations were based on a three-compartment model. At NP [¹⁵N]glycine was applicated orally and at LP by intravenous injection.

At both protein supply levels, feeding of SPI- resulted in significantly lower protein deposition than feeding of CAS+. This was a result of a simultaneous decrease of protein synthesis and degradation. Due to the lower requirement of essential AA of older pigs the differences in protein deposition and turnover rates between CAS+ and SPI- decreased with increasing B W. Feeding of SPI+ (measured only in 40 kg-pigs of NP) caused similar values of protein deposition, synthesis and degradation than CAS. Because the efficiency of protein synthesis (ratio of deposition to synthesis) was not altered in response to the dietary protein quality at both protein supply levels, it is concluded that with inadequate AA supply protein turnover runs on a lower basal level than with adequate AA supply.

Intravenous [¹⁵N]glycine administration caused approximately 30% higher estimates of whole-body protein synthesis than oral [¹⁵N]glycine administration did in identical CAS+ fed pigs of about 90 kg BW. This finding is consistent with literature data. However, because this relation is not yet verified in SPI- fed and in younger pigs, the effect of dietary protein quality on protein turnover can only be compared within both protein levels.

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Energy metabolism in animals

Proceedings of the 15th symposium on energy metabolism in animals

ISBN:: 9789004683600

出版社:: Wageningen Academic

印刷出版日期:: 01 Jan 2001

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- Life Sciences
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  - Animal & Veterinary

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Effects of casein and soy protein isolate on protein turnover in growing pigs fed on a constant energy supply

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Energy metabolism in animals

Proceedings of the 15th symposium on energy metabolism in animals

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