Digestible methionine levels for white-egg layer pullets from 7 to 12 weeks of age

Júnior, Jalceyr Pessoa Figueiredo; Guerra, Ricardo Romão; Santana, Marcelo Helder Medeiros; Lima, Matheus Ramalho de; Pinheiro, Sarah Gomes

doi:10.4025/actascianimsci.v42i1.47222

Acta Sci. Anim. Sci.

2020

DOI: 10.4025/actascianimsci.v42i1.47222

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Digestible methionine levels for white-egg layer pullets from 7 to 12 weeks of age

Jalceyr Pessoa Figueiredo Júnior

Ricardo Romão Guerra

Marcelo Helder Medeiros Santana

et al.

Abstract: An experiment was carried out to evaluate the requirement of digestible methionine for growing pullets at growth phase (7 to 12 weeks of age). A completely randomized design was distributed in five treatments, six replicates, and 15 pullets per experimental unit. 450 Dekalb White pullets from the 7th weeks of age, with an average initial weight of 313.14 ± 12.49 g were used. Dietary treatments consisted in five diets supplemented with DL-Methionine which resulted in five levels of digestible methionine (0.266,… Show more

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Cited by 2 publications

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Methionine plus Cystine Levels for Light Laying Hens on Growth Phase

Santana¹,

Costa²,

Guerra³

et al. 2021

Principia

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<p>The aim of this study was to evaluate the methionine plus cystine levels in the diets of laying hens during the rearing period (13-18 weeks old). The diets included a control diet formulated according to NRC and five other diets with different levels of this digestible methionine plus cystine (0.317, 0.356, 0.396, 0.436 and 0.475%) that have been based on the recommendations of the Brazilian poultry and swine tables. Performance, serological and histological variables were evaluated. There was linear effect on final body weight, weight gain, methionine plus cystine intake and feed conversion, and quadratic effect on the serum albumin levels, serum protein levels and relative spleen weight. The estimated level of digestible methionine plus cystine were 0.361%, 0.346% and 0.398%, for albumin activity, serum protein and relative weight of spleen, respectively. The different formulation bases significantly influenced the histology of the liver, small intestine and magnum. It is recommended the use of levels above 0.475% of digestible methionine plus cystine for light laying hens with 13-18 weeks old, which corresponded to a ratio of digestible methionine plus cystine: digestible lysine of more than 98%.</p>

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Methionine plus Cystine Levels for Light Laying Hens on Growth Phase

Santana¹,

Costa²,

Guerra³

et al. 2021

Principia

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Digestible methionine+cystine levels for white-egg layers aged one to six weeks

Figueiredo

Guerra

Santana

et al. 2020

RSD

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The aim of this study was was to determine the nutritional requirements of digestible methionine+cystine (M+C) for white-egg layers aged one to six weeks. A completely randomized design with five methionine+cystine levels, six replicates, and 30 birds per experimental unit was adopted. Dietary treatments consisted of five diets supplemented with DL-Methionine with resulted in five levels of digestible methionine + cystine, 80% (0.516%), 90% (0.578%), 100% (0.640%), 110% (0.702%), and 120% (0.764%), based on Brazilian tables of nutritional requirements. Performance, serological blood, and histological data were evaluated. Feed intake, feed conversion, hepatic glycogen deposition, enzymatic activity of alanine aminotransferase and gamma-glutamyl transferase, and serum creatinine and albumin levels had showed a quadratic response to the levels of digestible M+C, with the respective requirements: 89.78% (0.575%), 114.33% (0.732%), 86.50% (0.554%), 100% (0.640%), 100.40% (0.643%), 104.30% (0.668%), and 111.88% (0.716%). Increasing levels of methionine+cystine elevated the relative liver weight and the deposition of hepatic glycogen, in addition to promote higher growth in pullets, with better body weight and body weight gain and feed conversion ratio. Our findings suggest that 0.732% digestible methionine+cystine is recommended, which corresponds to an intake of 151.20 mg/bird/d and a Met+Cys:Lys ratio 83%, for light pullets from one to six weeks.

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Digestible methionine levels for white-egg layer pullets from 7 to 12 weeks of age

Cited by 2 publications

References 24 publications

Methionine plus Cystine Levels for Light Laying Hens on Growth Phase

Methionine plus Cystine Levels for Light Laying Hens on Growth Phase

Digestible methionine+cystine levels for white-egg layers aged one to six weeks

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