Optimum ratio of standardized ileal digestible tryptophan to lysine for piglets

Borgesa, G.; Woyengo, T. A.; Nyachoti, C. M.

doi:10.22358/jafs/65920/2013

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…A decrease in PUN indicates either an increase in nitrogen use efficiency or a decrease in protein breakdown, which could be a result of anabolic factors such as growth hormone or protein synthesis (Shen et al 2012). Under CL and UCL conditions, based on PUN as response criteria, the optimal SID Trp : Lys could not be estimated using regression analysis which is consistent with Borgesa et al (2013). This observation could be due to the lack of deficiency in Trp levels in the experimental diets.…”

Section: Discussionmentioning

confidence: 96%

“…Under CL and UCL conditions, based on PUN as response criteria, the optimal SID Trp : Lys could not be estimated using regression analysis which is consistent with Borgesa et al . (). This observation could be due to the lack of deficiency in Trp levels in the experimental diets.…”

Section: Discussionmentioning

confidence: 97%

“…Therefore, these levels might not be sufficient for piglets reared under commercial production conditions, whereby the chances of infections are high, and especially during the immediate post-weaning period. Under CL and UCL conditions, based on PUN as response criteria, the optimal SID Trp : Lys could not be estimated using regression analysis which is consistent with Borgesa et al (2013). PUN can be used as an indicator of protein utilization efficiency (Coma et al 1995) as PUN is known to increase when there is an excess or deficiency of AA, because excess AA cannot be stored and therefore are degraded with the production of urea (Heo et al 2009;Waguespack et al 2011).…”

Section: Discussionmentioning

confidence: 97%

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Effects of different dietary tryptophan : lysine ratios and sanitary conditions on growth performance, plasma urea nitrogen, serum haptoglobin and ileal histomorphology of weaned pigs

Jayaraman

Htoo

Nyachoti

2016

Animal Science Journal

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A total of 180 mixed-sex pigs (Duroc × (Yorkshire × Landrace); average initial body weight of 7.36 ± 0.2 kg) weaned at 21 ± 1 days were fed corn-soybean meal-wheat-based diets to determine the optimal standardized ileal digestible (SID) tryptophan to lysine ratio (Trp : Lys) in a 2 × 5 factorial arrangement (two sanitary conditions: clean (CL) and unclean (UCL), and five dietary treatments (SID Trp : Lys (16, 18, 20, 22 and 24%)). In each sanitary condition, blood was collected on days 0 and 14 to determine plasma urea nitrogen and on day 14, ileal tissue (one pig per pen) was collected for the measurement of gut morphology. Pigs kept under UCL conditions had lower growth rate (P < 0.05) than under CL conditions. Under CL conditions, the estimated optimal SID Trp : Lys for average daily gain (ADG) was 19.7% whereas under UCL conditions these values were 20.5% and 19.0% for ADG and gain-to-feed ratio, respectively. Under CL conditions, increasing SID Trp : Lys reduced (linear, P = 0.05) plasma urea nitrogen concentration but had no effect (P > 0.10) on villous height (VH), crypt depth ( CD) and VH : CD. In conclusion, an SID Trp : Lys to optimize ADG for pigs raised under UCL conditions was higher (4%) than CL conditions.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

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Effects of different dietary tryptophan : lysine ratios and sanitary conditions on growth performance, plasma urea nitrogen, serum haptoglobin and ileal histomorphology of weaned pigs

Jayaraman

Htoo

Nyachoti

2016

Animal Science Journal

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An Estimation of the Requirements of the Standardized Ileal Digestible Tryptophan, Valine, Isoleucine and Methionine on Young Pigs’ (Up to 50 kg) Feed Efficiency: A Meta-Regression Analysis

Chae,

Poaty Ditengou,

Lee

et al. 2024

Animals

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Currently, the NRC amino acid (AA) requirements for pigs published in 2012 are used as a reference in variable swine industries. However, recent results in several articles suggest that the standardized ileal digestible (SID) AA–lysine (Lys) ratio significantly evolved over the last two decades, while some publications report inconsistent outcomes. Therefore, the present study used a meta-regression analysis to assess the relative ratio to lysine to maximize the feed efficiency of four essential amino acids (tryptophan, valine, isoleucine, and methionine) in pig diets. According to the PRISMA guidelines, articles examining the target AA requirement using a basal diet supplemented with varying levels of crystalline AA (tryptophan, valine, isoleucine, or methionine) were identified across Scopus, PubMed, and Science Direct. As a result, 23, 22, 16, and 9 articles using tryptophan, valine, isoleucine, and methionine were selected and categorized into experiments for inclusion in our meta-analysis. The results suggested that the requirements of tryptophan, valine, isoleucine, and methionine in our meta-regression analysis were superior to NRC recommendations, regardless of the regression models and the growth phases with significant RSQ values (RSQ ≈ 1). Also, the QUAD and CLP regression models emphasized higher requirements than the LP model for the great majority of amino acids and growth phases. The results of the QUAD and CLP models were selected as estimations of the amino acid requirements for pigs under challenged conditions, whereas the LP model was chosen to estimate the amino acid requirements of genetically improved pigs under a modern housing system. The results of this meta-regression analysis could be used to refresh the information on the NRC amino acids (AA) requirements for swine.

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Optimum ratio of standardized ileal digestible tryptophan to lysine for piglets

Cited by 2 publications

References 22 publications

Effects of different dietary tryptophan : lysine ratios and sanitary conditions on growth performance, plasma urea nitrogen, serum haptoglobin and ileal histomorphology of weaned pigs

Effects of different dietary tryptophan : lysine ratios and sanitary conditions on growth performance, plasma urea nitrogen, serum haptoglobin and ileal histomorphology of weaned pigs

An Estimation of the Requirements of the Standardized Ileal Digestible Tryptophan, Valine, Isoleucine and Methionine on Young Pigs’ (Up to 50 kg) Feed Efficiency: A Meta-Regression Analysis

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