Author Liebert, Frank

• 2004 | Journal Article
  ​ ​Amino acid requirement of growing pigs depending on amino acid efficiency and level of protein deposition. 2nd communication: Threonine​
  Thong, H. T. & Liebert, F.​ (2004) 
  ARCHIVES OF ANIMAL NUTRITION-ARCHIV FUR TIERERNAHRUNG, 58(2) pp. 157​-168​.​ DOI: https://doi.org/10.1080/00039420410001667520 
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• 2004 | Journal Article
  ​ ​Growth, nutrient utilization and parameters of mineral metabolism in Nile tilapia Oreochromis niloticus (Linnaeus, 1758) fed plant-based diets with graded levels of microbial phytase​
  Portz, L. & Liebert, F.​ (2004) 
  Journal of Animal Physiology and Animal Nutrition, 88(9-10) pp. 311​-320​.​ DOI: https://doi.org/10.1111/j.1439-0396.2004.00486.x 
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• 2004 | Journal Article
  ​ ​Potential for protein deposition and threonine requirement of modern genotype barrows fed graded levels of protein with threonine as the limiting amino acid​
  Thong, H. T. & Liebert, F.​ (2004) 
  Journal of Animal Physiology and Animal Nutrition, 88(5-6) pp. 196​-203​.​ DOI: https://doi.org/10.1111/j.1439-0396.2004.00457.x 
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• 2004 | Journal Article
  ​ ​Amino acid requirement of growing pigs depending on amino acid efficiency and level of protein deposition 1st communication: Lysine​
  Thong, H. T. & Liebert, F.​ (2004) 
  ARCHIVES OF ANIMAL NUTRITION-ARCHIV FUR TIERERNAHRUNG, 58(1) pp. 69​-87​.​ DOI: https://doi.org/10.1080/00039420310001656695 
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• 2005 | Conference Paper
  ​ ​Nutrient utilization of Nile tilapia Oreochromis niloticus fed plant based low phosphorus diets supplemented with graded levels of different sources of microbial phytase​
  Liebert, F. & Portz, L.​ (2005)
  Aquaculture, 248(1-4) pp. 111​-119. ​11th International Symposium on Nutrition and Feeding in Fish​, Phuket Isl, THAILAND.
  Amsterdam​: Elsevier Science Bv. DOI: https://doi.org/10.1016/j.aquaculture.2005.04.009 
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• 2006 | Journal Article
  ​ ​Assessment of nitrogen maintenance requirement and potential for protein deposition in juvenile Tilapia genotypes by application of an exponential nitrogen utilization model​
  Liebert, F.; Suender, A. & Mohamed, K.​ (2006) 
  Aquaculture, 261(4) pp. 1346​-1355​.​ DOI: https://doi.org/10.1016/j.aquaculture.2006.05.029 
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• 2006 | Journal Article
  ​ ​Estimation of Nitrogen Maintenance Requirements and Potential for Nitrogen Deposition in Fast-Growing Chickens Depending on Age and Sex​
  Samadi, S. & Liebert, F.​ (2006) 
  Poultry Science, 85(8) pp. 1421​-1429​.​ DOI: https://doi.org/10.1093/ps/85.8.1421 
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• 2006 | Journal Article
  ​ ​Modeling of Threonine Requirement in Fast-Growing Chickens, Depending on Age, Sex, Protein Deposition, and Dietary Threonine Efficiency​
  Samadi, S. & Liebert, F.​ (2006) 
  Poultry Science, 85(11) pp. 1961​-1968​.​ DOI: https://doi.org/10.1093/ps/85.11.1961 
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• 2007 | Journal Article
  ​ ​On the alkaloid content of ergot (Claviceps purpurea)​
  Mainka, S.; Daenicke, S.; Boehme, H.; Ueberschaer, K.-H. & Liebert, F.​ (2007) 
  LANDBAUFORSCHUNG VOLKENRODE, 57(1) pp. 51​-59​.​
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• 2007 | Journal Article
  ​ ​On the composition of ergot and the effects of feeding two different ergot sources on piglets​
  Mainka, S.; Daenicke, S.; Boehme, H.; Ueberschaer, K.-H. & Liebert, F.​ (2007) 
  Animal Feed Science and Technology, 139(1-2) pp. 52​-68​.​ DOI: https://doi.org/10.1016/j.anifeedsci.2006.12.001 
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• 2007 | Conference Paper
  ​ ​Different sources of microbial phytase in plant based low phosphorus diets for Nile tilapia Oreochromis niloticus may provide different effects on phytate degradation​
  Liebert, F. & Portz, L.​ (2007)
  Aquaculture, 267(1-4) pp. 292​-299. ​12th International Symposium on Fish Nutrition and Feeding​, Biarritz, FRANCE.
  Amsterdam​: Elsevier Science Bv. DOI: https://doi.org/10.1016/j.aquaculture.2007.01.023 
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• 2007 | Journal Article
  ​ ​Modelling of threonine and methionine requirements of Oreochromis niloticus due to principles of the diet dilution technique​
  Liebert, F. & Benkendorff, K.​ (2007) 
  Aquaculture Nutrition, 13(6) pp. 397​-406​.​ DOI: https://doi.org/10.1111/j.1365-2095.2007.00490.x 
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• 2007 | Conference Paper
  ​ ​Modeling lysine requirements of Oreochromis niloticus due to principles of the diet dilution technique​
  Liebert, F. & Benkendorff, K.​ (2007)
  Aquaculture, 267(1-4) pp. 100​-110. ​12th International Symposium on Fish Nutrition and Feeding​, Biarritz, FRANCE.
  Amsterdam​: Elsevier Science Bv. DOI: https://doi.org/10.1016/j.aquaculture.2007.02.022 
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• 2007 | Journal Article
  ​ ​No impact of a phytogenic feed additive on digestion and unspecific immune reaction in piglets​
  Muhl, A. & Liebert, F.​ (2007) 
  Journal of Animal Physiology and Animal Nutrition, 91(9-10) pp. 426​-431​.​ DOI: https://doi.org/10.1111/j.1439-0396.2006.00671.x 
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• 2007 | Journal Article
  ​ ​Growth and parameters of microflora in intestinal and faecal samples of piglets due to application of a phytogenic feed additive​
  Muhl, A. & Liebert, F.​ (2007) 
  Journal of Animal Physiology and Animal Nutrition, 91(9-10) pp. 411​-418​.​ DOI: https://doi.org/10.1111/j.1439-0396.2006.00668.x 
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• 2008 | Journal Article | 
  ​ ​Microbial Phytase and Nutrient Utilization in Low Phosphorus Chicken Diets​
  Liebert, F.; Htoo, J. K. & Suender, A.​ (2008) 
  The Journal of Poultry Science, 45(4) pp. 255​-264​.​ DOI: https://doi.org/10.2141/jpsa.45.255 
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• 2008 | Journal Article
  ​ ​Modelling the optimal lysine to threonine ratio in growing chickens depending on age and efficiency of dietary amino acid utilisation​
  Samadi, S. & Liebert, F.​ (2008) 
  British Poultry Science, 49(1) pp. 45​-54​.​ DOI: https://doi.org/10.1080/00071660701821667 
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• 2008 | Journal Article
  ​ ​Modelling of protein metabolism yields amino acid requirements dependent on dietary amino acid efficiency, growth response, genotype and age of growing chicken​
  Liebert, F.​ (2008) 
  Avian Biology Research, 1(3) pp. 101​-110​.​ DOI: https://doi.org/10.3184/175815508X388074 
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• 2008 | Journal Article
  ​ ​Evaluation of dried distillers' grains with solubles (DDGS) as a protein source for broilers​
  Youssef, I. M. I.; Westfahl, C.; Suender, A.; Liebert, F. & Kamphues, J.​ (2008) 
  Archives of Animal Nutrition, 62(5) pp. 404​-414​.​ DOI: https://doi.org/10.1080/17450390802332985 
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• 2009 | Journal Article
  ​ ​Vitamin E supply of different matrices for laying hens​
  Suender, A. ; Wecke, C. & Liebert, F.​ (2009) 
  Archiv für Geflügelkunde, 73(3) pp. 145​-153​.​
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• 2009 | Journal Article
  ​ ​Current knowledge of protein and amino acid nutrition and metabolism in fish​
  Liebert, F.​ (2009) 
  Journal of Animal Physiology and Animal Nutrition, 93(6) pp. 787​-793​.​ DOI: https://doi.org/10.1111/j.1439-0396.2008.00869.x 
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• 2009 | Journal Article
  ​ ​Lysine requirement studies in modern genotype barrows dependent on age, protein deposition and dietary lysine efficiency​
  Wecke, C. & Liebert, F.​ (2009) 
  Journal of Animal Physiology and Animal Nutrition, 93(3) pp. 295​-304​.​ DOI: https://doi.org/10.1111/j.1439-0396.2009.00923.x 
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• 2010 | Journal Article
  ​ ​Lysine efficiency in piglets fed diets with a phytogenic feed additive and conclusion of lysine requirement data​
  Muhl, A. & Liebert, F.​ (2010) 
  Journal of Animal and Feed Sciences, 19(1) pp. 49​-58​.​
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• 2010 | Journal Article
  ​ ​Optimal dietary lysine to threonine ratio in pigs (30-110 kg BW) derived from observed dietary amino acid efficiency​
  Wecke, C. & Liebert, F.​ (2010) 
  Journal of Animal Physiology and Animal Nutrition, 94(6) pp. E277​-E285​.​ DOI: https://doi.org/10.1111/j.1439-0396.2009.00969.x 
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• 2010 | Journal Article
  ​ ​Increasing the incubation temperature between embryonic day 7 and 10 has no influence on the growth and slaughter characteristics as well as meat quality of broilers​
  Werner, C.; Wecke, C.; Liebert, F. & Wicke, M.​ (2010) 
  animal, 4(5) pp. 810​-816​.​ DOI: https://doi.org/10.1017/S1751731109991698 
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• 2012 | Journal Article
  ​ ​Improving the energy and nutrient supply for common marmoset monkeys fed under long-term laboratory conditions​
  Mitura, A.; Liebert, F.; Schlumbohm, C. & Fuchs, E.​ (2012) 
  Journal of Medical Primatology, 41(2) pp. 82​-88​.​ DOI: https://doi.org/10.1111/j.1600-0684.2011.00524.x 
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• 2013 | Journal Article | 
  ​ ​Improving the Reliability of Optimal In-Feed Amino Acid Ratios Based on Individual Amino Acid Efficiency Data from N Balance Studies in Growing Chicken​
  Wecke, C. & Liebert, F.​ (2013) 
  Animals, 3(3) pp. 558​-573​.​ DOI: https://doi.org/10.3390/ani3030558 
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• 2013 | Journal Article
  ​ ​Assessing the age-dependent optimal dietary branched-chain amino acid ratio in growing chicken by application of a nonlinear modeling procedure​
  Pastor, A.; Wecke, C. & Liebert, F.​ (2013) 
  Poultry Science, 92(12) pp. 3184​-3195​.​ DOI: https://doi.org/10.3382/ps.2013-03340 
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• 2015 | Journal Article | 
  ​ ​An Elevated Dietary Cysteine to Methionine Ratio Does Not Impact on Dietary Methionine Efficiency and the Derived Optimal Methionine to Lysine Ratio in Diets for Meat Type Chicken​
  Kahn, D. R.; Wecke, C. & Liebert, F.​ (2015) 
  Open Journal of Animal Sciences, 05(04) pp. 457​-466​.​ DOI: https://doi.org/10.4236/ojas.2015.54047 
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• 2015 | Journal Article | 
  ​ ​Evaluating the Age-Dependent Potential for Protein Deposition in Naked Neck Meat Type Chicken​
  Khan, D.; Wecke, C.; Sharifi, A. & Liebert, F.​ (2015) 
  Animals, 5(1) pp. 56​-70​.​ DOI: https://doi.org/10.3390/ani5010056 
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• 2015 | Journal Article | 
  ​ ​Does the Naked Neck Meat Type Chicken Yield Lower Methionine Requirement Data?​
  Khan, D.; Wecke, C. & Liebert, F.​ (2015) 
  Animals, 5(2) pp. 151​-160​.​ DOI: https://doi.org/10.3390/ani5020151 
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• 2016 | Journal Article
  ​ ​Validation of the Lysine Requirement as Reference Amino Acid for Ideal In-Feed Amino Acid Ratios in Modern Fast Growing Meat-Type Chickens​
  Wecke, C.; Pastor, A. & Liebert, F.​ (2016) 
  Open Journal of Animal Sciences, 6(3) pp. 185​-194​.​ DOI: https://doi.org/10.4236/ojas.2016.63024 
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• 2017 | Journal Article
  ​ ​Assessing Lysine Requirement of Growing Chicken by Direct Comparison between Supplementation Technique and “Goettingen Approach”​
  Samadi,  .; Wecke, C.; Pastor, A. & Liebert, F.​ (2017) 
  Open Journal of Animal Sciences, 7(1) pp. 56​-69​.​ DOI: https://doi.org/10.4236/ojas.2017.71006 
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• 2018 | Journal Article
  ​ ​Age and Gender Dependent Amino Acid Concentrations in the Feather, Feather-Free and Whole Empty Body Protein of Fast Growing Meat-Type Chickens​
  Wecke, C.; Khan, D. R.; Sünder, A. & Liebert, F.​ (2018) 
  Open Journal of Animal Sciences, 8(3) pp. 223​-238​.​ DOI: https://doi.org/10.4236/ojas.2018.83017 
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• 2018 | Journal Article
  ​ ​Age and Gender Dependent Nutrient Composition of Feather and Feather-Free Body Fractions in Meat-Type Chickens​
  Wecke, C.; Khan, D. R.; Sünder, A. & Liebert, F.​ (2018) 
  Open Journal of Animal Sciences, 8(1) pp. 74​-86​.​ DOI: https://doi.org/10.4236/ojas.2018.81006 
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• 2018 | Journal Article | 
  ​ ​Does the Optimal Dietary Methionine to Cysteine Ratio in Diets for Growing Chickens Respond to High Inclusion Rates of Insect Meal from Hermetia illucens?​
  Brede, A.; Wecke, C. & Liebert, F.​ (2018) 
  Animals, 8(11) art. 187​.​ DOI: https://doi.org/10.3390/ani8110187 
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• 2018 | Journal Article | Research Paper | 
  ​ ​N Balance Studies Emphasize the Superior Protein Quality of Pig Diets at High Inclusion Level of Algae Meal (Spirulina platensis) or Insect Meal (Hermetia illucens) when Adequate Amino Acid Supplementation Is Ensured​
  Neumann, C.; Velten, S. & Liebert, F.​ (2018) 
  Animals, 8(10) art. 172​.​ DOI: https://doi.org/10.3390/ani8100172 
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• 2019 | Journal Article
  ​ ​Age and Gender Dependent Deposition of Crude Nutrients and Energy in Fast Growing Meat-Type Chickens​
  Wecke, C. & Liebert, F.​ (2019) 
  Open Journal of Animal Sciences, 9(1) pp. 35​-50​.​ DOI: https://doi.org/10.4236/ojas.2019.91004 
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• 2022 | Journal Article
  ​ ​Egg yolk colour in organic production as affected by feeding – Consequences for farmers and consumers​
  Sünder, A.; Wilkens, M.; Böhm, V. & Liebert, F.​ (2022) 
  Food Chemistry, 382 art. S0308814621028600​.​ DOI: https://doi.org/10.1016/j.foodchem.2021.131854 
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• 2023 | Journal Article | 
  ​ ​Does Genetic Background of Rainbow Trout Impact Growth and Feed Utilisation following Fishmeal Substitution by Partly Defatted Insect Meal (Hermetia illucens) or Microalgae Powder (Arthrospira platensis)?​
  Dietz, C.; Wessels, S.; Sünder, A.; Sharifi, R.; Gährken, J. & Liebert, F.​ (2023) 
  Aquaculture Research, 2023 pp. 1​-11​.​ DOI: https://doi.org/10.1155/2023/4774048 
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