Lysine Levels in Starter and Grower-Finisher Diets Affect Broiler Performance and Carcass Traits

Kidd, M. T.; Kerr, B. J.; Halpin, K.; McWard, G. W.; Quarles, C. L.

doi:10.1093/japr/7.4.351

Cited by 87 publications

(53 citation statements)

References 19 publications

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“…The results confirmed the findings of previous studies that demonstrated that Lys requirements for growing chickens are higher than the NRC's (1994) recommendation for maximal growth (Kidd et al,1998;. It is also confirmed that increasing dietary Lys level increases breast meat yield .…”

Section: Effects Of Lysine Levels Of Diets Formulated Based On Total supporting

confidence: 90%

Effects of lysine levels of diets formulated based on total or digestible amino acids on broiler carcass composition

Nasr

Kheiri

2012

Rev. Bras. Cienc. Avic.

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The study was conducted to evaluate carcass yield and chemical composition of thigh and breast muscles of broilers fed three different lysine requirement levels: high lysine (+10% NRC), standard (NRC) and low lysine (-10% NRC) and two ways of expressing amino acids in feedstuffs (total or digestible amino acids). The results of this study showed that diet formulation based on digestible amino acids significantly influenced breast yield and abdominal fat deposition. The study showed that increasing lysine level (+10% NRC) of diet significantly increased both carcass and breast percentage and also carcass, breast and thigh weight. The interaction between digestible amino acids and lysine requirement levels affected carcass and breast percentage. Feeding broilers high lysine diets (+10% NRC) significantly increased lysine content in breast and thigh. The response to formulation based on digestible amino acids was maximized when broilers received the high lysine level diet.

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Section: Effects Of Lysine Levels Of Diets Formulated Based On Total supporting

confidence: 90%

Effects of lysine levels of diets formulated based on total or digestible amino acids on broiler carcass composition

Nasr

Kheiri

2012

Rev. Bras. Cienc. Avic.

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“…Increasing Lys level in the diet increased breast meat weight (from 291.27 to 365.15 g), BWG (from 1324.6 to 1623 g), thigh (from 335.3 to 402.2) and decreased FCR (from 2.53 to 2.16) and fat pad percentage (from 3.37 to 2.66) as reported by other researches (Bilgili et al 1992;Han andBaker 1994, Gorman andBalnave 1995;Kidd et al 1998;Rezaei et al 2004;Dozier et al 2008;Ghahri et al 2010). The concentration of dietary Lys can significantly influence breast meat yield for several reasons: it contains a high concentration of Lys; breast meat represents a large portion of carcass meat.…”

Section: Discussionsupporting

confidence: 75%

Estimation of dietary lysine requirement based on broken line and quadratic model analyses with the use performance and immune responses criterion

Taghinejad-Roudbaneh

Nazeradl

Taghavi

et al. 2011

Journal of Applied Animal Research

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The aim of this study was to determine the effects of supplementing Lysine (Lys) at on growth performance and immune responses of broiler chickens challenged with infectious bursal disease (IBD) and estimation of Lys requirement based on different response criterions. A total of 400-day-old male broiler chicks were assigned to eight dietary treatments. Chickens were fed by eight graded levels of Lys (0.8 National Research Council (NRC) (0.75% of diet), 0.9 NRC (0.85% of diet), NRC (0.94 of diet), 1.1 NRC (1.03% of diet), 1.2 NRC (1.13% of diet), 1.3 NRC (1.22% of diet), 1.5 NRC (1.41% of diet) and 1.8 NRC (1.69% of diet)) from day 21 to 42 of age. On day 28, all birds were challenged with a commercial live-IBDV vaccine. Body weight gains (BWG), feed conversion ratio (FCR) and carcass characterization (breast, thigh and fat pad percentage) were significantly influenced by dietary Lys levels. With increasing Lys level up to 1.22% of diet, performance improved significantly and with higher than this level decreased. Antibody titre against IBD was influenced by Lys levels. On 7 and 14 days after IBD challenge, antibody titre against IBD of broilers that receive diet that contain Lys higher than NRC recommendation wwas significantly higher than those receive lower level and the highest antibody level found in 1.22% Lys in diet. The highest (1.251990.0441) and the lowest (1.040890.11) Lys requirements with straightbroken line analysis were estimated for immune response and carcass efficiency percentage, respectively. The results obtained on the present study indicated that Lys requirements of broiler based on recommendation of NRC are not sufficient to meet the requirement of the new commercial poultry and commercial broiler companies under non-hygienic condition.

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“…In agreement with our results, Nasr and Kheiri (2011) reported that there was a significantly higher body weights in broilers fed with 120% of lysine relative to NRC recommendations. Kidd et al (1998) reported that the breast meat weight and yield increased when broilers received the higher lysine levels in the starter diets. Labadan et al (2001) suggested that broilers in the first two weeks of their age need more lysine than that of recommended by NRC for maximum breast meat production.…”

Section: Resultsmentioning

confidence: 99%

Effect of different levels of lysine and threonine on carcass characteristics, intestinal microflora and growth performance of broiler chicks

Kheiri

Alibeyghi

2017

Italian Journal of Animal Science

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The aim of current study was to evaluate the effect of different levels of lysine and threonine on performance, carcass characteristics and intestinal microflora of broiler. Nine hundred and sixty Ross 308 one-day-old female broiler chicks were selected, and they were randomly divided in a factorial design with 12 treatments, four replicates and 20 chicks in each replicate. The tested diets included four levels of lysine (100, 110, 120 and 130%, suggested by NRC) and three levels of threonine (100, 110 and 120%, suggested by NRC). Two phase (starter 0-21d; finisher 22-42 d) feeding schedule was followed. Results showed that of 21 days of age, 120% of lysine and threonine the live and carcass weights and breast, thigh and liver yields in chicks increased (p < .05). At the age of 42 days those treatments which received 120% of threonine gained the highest rate of live and carcass weights and yield of carcass characteristics. The intestinal microflora, in 42 days of age, with the increase in concentration of lysine significantly decreased in the intestinal microflora. The level of threonine in diet, and the interaction between threonine and lysine at 42 days of age effect on intestinal microflora. The best feed conversion ratio was related to 120% lysine. According to the results of this study, the carcass characteristics and growth performance can be improved with increasing in lysine and threonine levels to 120% above from NRC recommendations for commercial broilers. ARTICLE HISTORY

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Lysine Levels in Starter and Grower-Finisher Diets Affect Broiler Performance and Carcass Traits

Cited by 87 publications

References 19 publications

Effects of lysine levels of diets formulated based on total or digestible amino acids on broiler carcass composition

Effects of lysine levels of diets formulated based on total or digestible amino acids on broiler carcass composition

Estimation of dietary lysine requirement based on broken line and quadratic model analyses with the use performance and immune responses criterion

Effect of different levels of lysine and threonine on carcass characteristics, intestinal microflora and growth performance of broiler chicks

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