Lysine requirement studies in modern genotype barrows dependent on age, protein deposition and dietary lysine efficiency

Wecke, C.; Liebert, F.

doi:10.1111/j.1439-0396.2009.00923.x

Cited by 32 publications

(46 citation statements)

References 36 publications

(97 reference statements)

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“…Assuming 85% as an average of ileal lysine digestibility, these recommendations are in the scope of presented requirement data for 100 g daily protein deposition. Our reported lysine requirement data for piglets are also in line with several other studies (Gatel et al, 1992;Whittemore et al, 2003;Wecke and Liebert, 2009). For feed formulation, Bertolo et al (2005) recommended 0.91% ileal digestible lysine (24.1 kg BW; 982 g daily feed intake), which are in line with our data (85% predicted ileal lysine digestibility) and several other studies (Martinez and Knabe, 1990;Coma et al, 1995).…”

Section: Discussionsupporting

confidence: 81%

“…Analysis of N-balance data and modelling procedure was conducted according to Liebert and Wecke (2008). Additional current applications of the N-utilization model are reported elsewhere (Thong and Liebert, 2004a,b,c;Liebert, 2008;Wecke and Liebert, 2009). …”

Section: Discussionmentioning

confidence: 99%

“…Model parameters NMR and NR T were taken from earlier studies with r max similar genotype barrows (Wecke and Liebert, 2009). Assessment of dietary protein quality (b) utilized equation (2):…”

Section: Discussionmentioning

confidence: 99%

“…The current study investigated parameters of digestibility, protein utilization and dietary lysine efficiency. A validated procedure (Liebert, 2008;Liebert and Wecke, 2008;Wecke and Liebert, 2009) for modelling of protein utilization depending on observed dietary amino acid efficiency was applied for conclusion of lysine requirement data for piglets.…”

Section: Introductionmentioning

confidence: 99%

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Lysine efficiency in piglet fed diets with a phytogenic feed additive and conclusion of lysine requirement data

Muhl¹,

Liebert²

2010

J. Anim. Feed Sci.

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Two experiments were conducted to examine effects of a commercial phytogenic feed additive (PFA), containing inulin, an essential oil mix (carvacrol, thymol), and chest nut meal (polyphenols) on nutrient digestibility, protein utilization, and lysine efficiency in piglets. Each experiment utilized sixteen piglets (male castrated, 8 wk) and four experimental groups. Experiment 1 studied graded levels of the PFA (0, 0.05, 0.1, 0.15%) in lysine limited diets (wheat, barley, soyabean meal, fish meal). Experiment 2 examined 0.1% of the PFA and two dietary levels of lysine. The results indicated that apparent nutrient digestibility, protein utilization, and lysine efficiency were not significantly affected by the PFA (P>0.05). Observed daily lysine requirements (7.3, 9.9 and 13.1 g for 76, 100, 124 g daily protein deposition) in growing barrows (20-30 kg body weight) were in line with recommendations and contribute to the limited database for modelling of lysine requirements in piglets.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lysine efficiency in piglet fed diets with a phytogenic feed additive and conclusion of lysine requirement data

Muhl¹,

Liebert²

2010

J. Anim. Feed Sci.

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“…Model-specific parameters as utilized in current applications were justified in earlier and recent publications (e.g. Liebert et al, 2000;Thong and Liebert, 2004a-c;Samadi and Liebert, 2006a, b, 2007a, b, 2008Liebert and Benkendorff, 2007a, b;Liebert, 2008Liebert, , 2009Liebert and Wecke, 2008;Samadi et al, 2017;Wecke and Liebert, 2009Wecke et al, 2016;Dorigam et al, 2017) and can be condensed as follows: , b is the slope of the NR curve indicating the dietary protein quality (the slope of the curve for a given protein quality is independent on NI), and e is the basic number of the natural logarithm (ln).…”

Section: Current Applicationsmentioning

confidence: 99%

Invited review: Further progress is needed in procedures for the biological evaluation of dietary protein quality in pig and poultry feeds

Liebert

2017

Arch. Anim. Breed.

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Abstract. Recently, biological procedures for feed protein evaluation in pig and poultry diets have been based on the amino acid composition of feed ingredients considering the animal's losses during processes of digestion or total protein utilization in a different manner. Such a development towards individual amino acids (AAs) was inevitable according to the disadvantage of traditional protein quality measures, like biological value (BV) or net protein utilization (NPU), to be non-additive in complex animal diets. In consequence, such measures are generally not suitable for predicting the final protein quality of protein mixtures from the individual protein value of feed ingredients. Otherwise, recent measures of AA disappearance from the small intestine up to the end of the ileum (ileal AA digestibility) also do not provide a true reflection of the biological availability of individual feed AAs independent of the extent of taking into account endogenous AA losses during digestion processes. Sophisticated procedures for protein evaluation are needed considering the AA losses, both during absorption and utilization after absorption. Advantages and limitations of important developments in procedures are discussed. Accordingly, the development of an exponential modelling approach is described (the "Göttingen approach"), which overcomes some of the traditional disadvantages by measuring the individual AA efficiency. Connecting feed protein evaluation, the modelling of quantitative AA requirements, and improved ideal protein concepts offers different fields of application. In addition, as demonstrated by example, the modelling of nitrogen losses per unit protein deposition and the minimizing of this parameter yields a further interesting tool for lowering the nitrogen burden from protein utilization processes. Finally, it is pointed out that traditional laboratory procedures also need to be updated, adapted to current knowledge, and validated according to the increasing hurdles for animal studies from the viewpoint of animal welfare. Modelling is a procedure with the potential to reduce the number of experimental animals significantly. This development needs more attention, higher acceptance, and wider application in the future of protein evaluation.

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Modelling of lysine requirement in broiler breeder hens based on daily nitrogen retention and efficiency of dietary lysine utilization

Dorigam

Sakomura

Soares

et al. 2017

Animal Feed Science and Technology

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The current feeding programs used for broiler breeder hens need information on how to make use of the genetic potential more efficiently by modelling the amino acid (AA) requirements. Thus, this study aimed to determine the model parameters for maximum nitrogen retention (NR max T), nitrogen maintenance requirement (NMR) and the efficiency of lysine utilization (bc −1) to determine the lysine (Lys) requirements of broiler breeder hens. Nitrogen balance trials were performed in two periods (I: 31-35 wks and II: 46-50 wks). Seven dietary treatments were used with eight replicates and one hen per cage; the treatments consisted of seven diets with protein levels ranging from 58.8 to 311.9 g/kg of feed, with Lys being limiting in the dietary protein (c = 3.91 g of Lys in 100 g of CP). For each period, nitrogen intake (NI), nitrogen excretion (NEX), nitrogen in egg mass (NEM), nitrogen deposition (ND) and nitrogen retention (NR, NR = ND + NEM + NMR) were obtained in a N balance trial of 25 days. The NMR was calculated as the intersection point of the exponential curve between NEX and NI at NI = 0. The NR max T and b (slope related to protein quality) were estimated by the exponential fit between NR and NI. The Lys efficiency bc −1 was obtained dividing b by c. The likelihood ratio test for the model parameters yielded 255 mg/BW kg 0.67 for NMR, 0.000117 for b and 1684 mg/BW kg 0.67 (period I) and 1484 mg/BW kg 0.67 (period II) for NR max T. The necessary Lys intake dependent on NR and Lys efficiency was derived by the equation Lys = (lnNR max T-ln(NR max T-NR))/(16 × bc −1). Lys intakes required to achieve 0.80 times the maximum potential (NR max T) were 915 mg and 876 mg in the period I and II, respectively. For broiler breeder hens, assuming 0.80 times the NR max T value and average efficiency of Lys utilization, 6.02 g/kg (31-35 wk) and 5.96 g/kg (46-50 wk) digestible dietary Lys were observed as optimal digestible Lys concentration in the diet (corresponding to 152 and 147 g of daily feed intake, respectively). Results of model calculations need verification in performance trials with evaluation of nitrogen deposition and varying dietary Lys efficiencies.

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Lysine requirement studies in modern genotype barrows dependent on age, protein deposition and dietary lysine efficiency

Cited by 32 publications

References 36 publications

Lysine efficiency in piglet fed diets with a phytogenic feed additive and conclusion of lysine requirement data

Lysine efficiency in piglet fed diets with a phytogenic feed additive and conclusion of lysine requirement data

Invited review: Further progress is needed in procedures for the biological evaluation of dietary protein quality in pig and poultry feeds

Modelling of lysine requirement in broiler breeder hens based on daily nitrogen retention and efficiency of dietary lysine utilization

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