Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks

Rocha, Tatiana Cristina da; Donzele, Juarez Lopes; Gomes, Paulo Cézar; Mello, Heloisa Helena de Carvalho; Troni, Allan Reis; Viana, Gabriel da Silva

doi:10.1590/s1516-35982013001100003

Cited by 7 publications

(18 citation statements)

References 10 publications

(18 reference statements)

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“…(2016) , where Lohmann Brown hens aged 28 to 40 wk showed no difference in performance when fed a 14.2% CP diet fortified with Ile between 72 and 123% total Ile to total Lys. Phase 2 results from the present study agree with these findings, in that the lowest level of dietary Ile was satisfactory to yield an EM and FCR similar to CON; however, optimal performance was observed when hens were provided an SID Ile:Lys ratio of 82%, similar to the findings of Rocha et al. (2013) .…”

Section: Resultssupporting

confidence: 87%

“… Bregendahl et al., 2008 , Leeson and Summers, 2005 , and the CVB (1996) suggested that the ideal SID Ile:Lys ratio for laying hens is 79% (calculated from true digestible, total and digestible AA, respectively), which is lower than the 86% suggested by Coon and Zhang (1999) and the 94% (calculated from total AA) suggested by the NRC (1994) . Rocha et al. (2013) found the optimal SID Ile:Lys ratio for laying hens aged 24 to 40 wk was between 82 and 84%.…”

Section: Resultsmentioning

confidence: 94%

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Egg production and quality responses to increasing isoleucine supplementation in Shaver white hens fed a low crude protein corn-soybean meal diet fortified with synthetic amino acids between 20 and 46 weeks of age

Parenteau

Stevenson²,

Kiarie

2020

Poultry Science

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The present study evaluated production performance responses to Ile supplementation in laying hens fed low crude protein ( LCP ), amino acid ( AA ) balanced diets. A total of 179 Shaver white pullets were distributed into 30 battery cages (6 birds/cage, n = 6) and observed over the course of 27 wk in a 2-phase (20 to 27 and 28 to 46 wk of age) feeding program. Five isocaloric diets were formulated for standardized ileal digestible ( SID ) Lys intake of 750 and 710 mg/D in phase 1 and 2, respectively, and included a positive control with standard levels of crude protein ( CP ) ( CON ; 18 and 16% CP for phases 1 and 2), and 4 LCP diets (16 and 14% CP for phase 1 and 2, respectively) with graded levels of Ile to satisfy SID Ile:Lys ratios of 70 ( Ile70 ), 80 ( Ile80 ), 90 ( Ile90 ), and 100% ( Ile100 ). Based on analyzed dietary AA, the calculated SID Ile:Lys of LCP diets were 75, 84, 88, 99% and 66, 72, 82, 95% for phase 1 and 2, respectively. Dietary treatments significantly ( P < 0.05) affected feed intake, hen-day egg production ( HDEP ), egg weight ( EW ), feed conversion ratio, and egg quality (Haugh unit) and composition (yolk to albumen). Lowering dietary CP negatively affected HDEP with a 3.3 and 1.5% reduction in phase 1 and 2, respectively, and this was restored with the addition of Ile ( P < 0.001) suggesting that Ile was limiting in the LCP basal diet. Average EW was reduced in Ile100 only; however, the Ile:Lys appeared to influence egg size uniformity, with Ile90 producing a greater proportion of large (56 g ≤ EW > 63 g) eggs, suggesting that Ile may be used to manipulate EW at the expense of HDEP. Overall, the results indicated that CP in laying hen diets can be reduced by 2% units if fortified with synthetic AA (Met, Lys, Thr, Trp) + Ile, with optimal responses observed between 82 and 88% SID Ile:Lys.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 94%

Egg production and quality responses to increasing isoleucine supplementation in Shaver white hens fed a low crude protein corn-soybean meal diet fortified with synthetic amino acids between 20 and 46 weeks of age

Parenteau

Stevenson²,

Kiarie

2020

Poultry Science

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“…Basal diet was formulated based on corn and soybean meal to contain 149.58 g CP/kg diet and 2,900 kcal AMEn/kg diet). Ideal digestible ratios of Met + Cys, Thr, Trp, Val, Arg, Ile and Phe + Tyr relative to SID Lys were 103,81,28,96,103,80, and 121%, which corresponded to 3.0 perceptual point above the ratios recommended by Brumano et al (2010), Rocha et al (2013a), Calderano et al (2012), Rostagno et al (2011), Bregendahl et al (2008, Rocha et al (2013b) and Rostagno et al (2011), respectively. Throughout the study, hens were provided mash feed and water ad libitum.…”

Section: Husbandry Diets and Experimental Designmentioning

confidence: 72%

Standardized ileal digestible lysine requirement of white commercial layers in peak egg production

Pastore¹,

Gomes²,

Viana³

et al. 2018

Biosci. J.

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This study was conducted to determine the standardized ileal digestible lysine (SID Lys) requirements for white commercial layers in peak egg production phase. A total of two hundred eighty-eight 24 week-old Hy-Line W-36 layers were randomly assigned to one of six treatments groups, with eight replicates of six hens each. A basal diet, SID Lys-deficient, was graded supplemented with L-Lysine HCl (78.4%) in order to produce experimental treatments (6.0, 6.6, 7.2, 7.8, 8.4 and 9.0 g SID Lys/kg diet). Throughout the 16-week-feeding trial (24 to 40 weeks of age) hens had free access to water and mash feed. Data were analyzed as one-way ANOVA and optimum SID Lys level for each dependent variable assessed were estimated using polynomial and linear broken-line regression model. Feed intake and SID Lys intake were both linearly enhanced by graded SID Lys levels. According to linear broken-line regression model, the breakpoint for egg production, egg weight, and egg mass occurred at 8.14, 8.56 and 8.35 g SID Lys/kg diet, respectively. The breakpoint for feed conversion per egg mass (kg/kg) and per dozen of eggs (kg/dozen) occurred at 8.48 and 7.80 g SID Lys/kg diet, respectively. Eggshell weight and albumen weight were unaffected by dietary SID Lys supply. Weight gain and yolk weight reached optimum values at 8.33 and 8.03 g SID Lys/kg diet, respectively, according to linear broken-line regression model. In conclusion, SID Lys requirement for white commercial layers in peak egg production phase is 8.48 g/kg diet, which corresponds to an average daily SID Lys intake of 813 mg/hen.

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“…Rocha et al. () reported that the optimum levels of dietary Met and lysine requirements of layer hens at the peak of laying from 24 to 40 weeks of age were 0.43% and 0.95% respectively. In addition, D'Agostini et al.…”

Section: Introductionmentioning

confidence: 99%

Dietary methionine requirement of Jing Brown layer hens from 9 to 17 weeks of age

Meng

Yang

et al. 2016

Animal Physiology Nutrition

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This study was conducted to evaluate the effect of dietary methionine (Met) supplementation in growth performance and reproductive performance of Jing Brown layer hens. A total of 375 9-week-old Jing Brown layer hens were allocated equally to five treatments consisting of 5 replicates with 15 hens. Hens were fed with a diet of corn and soya bean meal supplemented with 0.23%, 0.27%, 0.31%, 0.35% and 0.39% Met respectively. Different Met levels did not significantly affect average daily feed intake (ADFI), average daily gain (ADG) and feed/gain ratio (F/G) (p > 0.05), whereas flock uniformity (FU) and jejunum index were significantly different (p < 0.05), and the largest FU was observed in 0.31% Met. Dietary supplementation of Met significantly affected reproductive system development (p < 0.05), and 0.27-0.31% Met obtained optimal reproductive system development. Different Met levels significantly affected serum uric acid and alkaline phosphatase. Moreover, the relatively higher reproductive hormones in serum were observed in 0.27% Met. Analysis of quadratic curve estimation of flock uniformity, the total number of follicles, the primary follicles and the secondary follicles showed that the optimal Met levels were 0.293%, 0.286%, 0.286% and 0.288%, which could be averaged to 0.288%. These results suggested that the optimal Met requirement for Jing Brown layer hens from 9 to 17 weeks old is 0.29%.

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Ideal digestible isoleucine: digestible lysine ratio in diets for laying hens aged 24-40 weeks

Cited by 7 publications

References 10 publications

Egg production and quality responses to increasing isoleucine supplementation in Shaver white hens fed a low crude protein corn-soybean meal diet fortified with synthetic amino acids between 20 and 46 weeks of age

Egg production and quality responses to increasing isoleucine supplementation in Shaver white hens fed a low crude protein corn-soybean meal diet fortified with synthetic amino acids between 20 and 46 weeks of age

Standardized ileal digestible lysine requirement of white commercial layers in peak egg production

Dietary methionine requirement of Jing Brown layer hens from 9 to 17 weeks of age

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