Amino acid requirement of growing pigs depending on amino acid efficiency and level of protein deposition. 2nd communication: threonine
- 1 April 2004
- journal article
- research article
- Published by Informa UK Limited in Archives of Animal Nutrition
- Vol. 58 (2), 157-168
- https://doi.org/10.1080/00039420410001667520
Abstract
This study was conducted to evaluate the variability of the efficiency of threonine in different feed proteins for growing pigs. This information is of importance for actual conclusions about threonine requirement within the exponential N-utilization model ( Liebert and Gebhardt, 1986 Liebert, F and Gebhardt, G . 1986. Ergebnisse zur Wirksamkeit und zum Bedarf an ausgewählten Aminosäuren beim wachsenden weiblichen Schwein. 1. Mitteilung: Lysine. Arch. Anim. Nutr, 36: 1077–1086. [Taylor & Francis Online], [Web of Science ®] [Google Scholar] ) used in our investigations. Wheat (as basal protein), high-protein soybean meal, low-protein soybean meal, rapeseed meal, field bean (Vicia faba), peas (Pisum sativum), corn gluten meal and soybean protein concentrate were used as protein sources. Fifty-six growing barrows (40 – 65 kg BW) of the genotype Piétrain × (Duroc × Landrace) were randomly allotted to eight N-balance experiments (n = 7). Diets were formulated with two main ingredients (wheat + one feed protein) with threonine as the first limiting amino acid in the mixture which was partly supplemented with crystalline amino acids. Based on N-balance data, the efficiency of threonine was determined in protein mixtures and individual feed proteins. Threonine requirement was calculated depending on efficiency of threonine and level of daily protein deposition. The results from the present studies indicate that the efficiency of threonine in different feed proteins varied in a wide range. Consequently, this factor has to be taken into account for requirement calculations. The threonine requirement depending on daily protein deposition (130, 145 and 160 g) and the efficiency of threonine according to different reference units (g/BWkg −0.67/d, g/d and % of threonine in the diet) were calculated. The threonine requirement of growing barrows (50 kg BW) corresponding to an average threonine efficiency was 8.52, 9.92 and 11.61 g/d for a daily protein deposition of 130, 145 and 160 g, respectively. The results for a daily protein deposition of 145 or 160 g are in agreement with actual studies and recommendations for threonine supply.Keywords
This publication has 22 references indexed in Scilit:
- Methodical investigations about evaluation of lysine utilization In reply to: Pigs following extreme changes of protein quantity and protein qualityArchives of Animal Nutrition, 1995
- Results about lysine utilization in growing monogastric animals with special respect to different lysine sourcesArchives of Animal Nutrition, 1995
- Neue Ergebnisse und Aufgaben zur Lysinwirksamkeitsbeurteilung in Futtermitteln für MonogastridenArchives of Animal Nutrition, 1991
- Zum Proteinansatzvermögen von Ferkeln verschiedener Rassen und GenotypenArchives of Animal Nutrition, 1990
- Amino acid and energy interactions in growing pigs. 3. Effects of sex and live weight and cereal on the responses to dietary lysine concentration when fed ad libitum or to a restricted food scale on diets based on wheat or barleyAnimal Science, 1987
- Ergebnisse zur Wirksamkeit und zum Bedarf an ausgewählten Aminosäuren beim wachsenden weiblichen SchweinArchives of Animal Nutrition, 1986
- Amino acid requirements of growing pigs. 7. The response of pigs from 25 to 55 kg live weight to dietary ideal proteinAnimal Science, 1986
- Amino acid and energy interactions in growing pigs 2. Effects of food intake, sex and live weight on responses to lysine concentration in barley-based dietsAnimal Science, 1986
- Amino acid requirements of growing pigs 3. ThreonineAnimal Science, 1982
- The optimal amino acid supplementation of barley for the growing pigBritish Journal of Nutrition, 1979