Potential for protein deposition and threonine requirement of modern genotype barrows fed graded levels of protein with threonine as the limiting amino acid
- 28 May 2004
- journal article
- Published by Wiley in Journal of Animal Physiology and Animal Nutrition
- Vol. 88 (5-6), 196-203
- https://doi.org/10.1111/j.1439-0396.2004.00457.x
Abstract
The study was conducted to estimate the actual genetic potential for daily protein deposition of growing barrows [genotype: Piétrain x (Duroc x Landrace)]. Twenty-four pigs with an average initial body weight (BW) of 43.7 +/- 0.7 kg were used in a N-balance study. Semi-purified diets with graded levels of crude protein (45.8, 94.2, 148.0, 198.9, 255.5 and 300.2 g/kg DM) were used, based on a constant mixture of wheat, soya bean protein concentrate and potato protein concentrate as protein sources. The amino acid pattern of the diets was according to the ideal amino acid ratio for growing pigs (Wang and Fuller, 1989), with the exception of threonine (adjusted as limiting amino acid). N-balance data were used to estimate daily N-maintenance requirement (NMR = 446 mg N/BW0.67 kg/day) by regression method and the theoretical maximum of daily N-retention (PDmaxT = 3115 mg N/BW0.67 kg/day) based on N-utilization model of Gebhardt (1966) using program Mathematica 3.0. The results indicate that PDmaxT of pigs under study is much higher than results from earlier studies with older genotypes. In summary, pigs of modern genotype have a very high genetic potential for daily protein deposition and these actual data are important basic informations for estimation of amino acid requirement within the model used. Threonine requirement data depending on threonine efficiency and protein deposition (8.96, 10.45 and 12.22 g/day for 130, 145 and 160 g daily protein deposition; 50 kg body weight) are discussed.Keywords
This publication has 14 references indexed in Scilit:
- Origin of the holothurians (Echinodermata) derived by constructional morphologyFossil Record, 2002
- The effect of body weight on the upper limit to protein deposition in a defined population of growing gilts.Journal of Animal Science, 1998
- Zum Proteinansatzvermögen von Ferkeln verschiedener Rassen und GenotypenArchives of Animal Nutrition, 1990
- The optimum dietary amino acid pattern for growing pigsBritish Journal of Nutrition, 1989
- Ergebnisse zur Wirksamkeit und zum Bedarf an ausgewählten Aminosäuren beim wachsenden weiblichen SchweinArchives of Animal Nutrition, 1986
- The Lysine Requirement of the Growing Boar versus BarrowJournal of Animal Science, 1984
- Amino acid requirements of growing pigs 3. ThreonineAnimal Science, 1982
- Effects and Interactions of Breed Group, Sex and Protein Level on Performance of SwineJournal of Animal Science, 1977
- Growth and Carcass Characteristics of High- and Low-Fat Swine Fed Diets Varying in Protein and Lysine ContentJournal of Animal Science, 1976
- Protein Effect on Growth and Carcass Composition of Swine Selected for High and Low FatnessJournal of Animal Science, 1969