Amino Acid Requirements for Maintenance in the Adult Rooster

Leveille, Gilbert A.; Shapiro, R.; Fisher, Hans

doi:10.1093/jn/72.1.8

Cited by 76 publications

(9 citation statements)

References 6 publications

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“…Since maintenance is the common component for both chicks and laying hens, the requirement as determined by Leveille et al (1960) was re-examined. This examination suggested that the supportive data for their PRESENT REQUIREMENT,mg/Cal FIG.…”

Section: Discussionmentioning

confidence: 99%

“…The protein requirement for maintenance, as determined by Leveille et al (1960), and multiplied by 0.9 (absorption coefficient of purified protein) and divided by 0.85 (absorption of protein from natural feedstuffs; Hurwitz et al 1972), was taken as the basis of calculation. Accordingly, the protein (ideal composition) requirement for maintenance (PRm) is given by:…”

Section: G Gmentioning

confidence: 99%

“…The calculation of the amino acid requirement (AAR m ) used the proportion of each amino acid (AA m ) in the maintenance protein as determined by Leveille et al (1960) and given in Table 2, as follows:…”

Section: G Gmentioning

confidence: 99%

“…Workable equations to calculate the amino acid requirements using maintenance (Leveille et al, 1960), and tissue and egg composition, have been proposed by us previously (Hurwitz and Bornstein, 1973). The applicability of one of the models presented there, has been recently affirmed in a large series of experiments (Hurwitz and Bornstein, 1977).…”

mentioning

confidence: 99%

“…Recalculated from data ofLeveille et al (1960) and expressed as the amino acid requirement as a percentage of the protein requirement.…”

mentioning

confidence: 99%

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New Formal Approaches to the Determination of Energy and Amino Acid Requirements of Chicks

1978

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Body weight and the intake of metabolizable energy of chicks as function of age, were resolved into a linear equation from which the energy requirements for maintenance and growth were extracted. The metabolizable energy requirement for maintenance was calculated to be 1.91 and 1.62 Cal./g. 2/3, and that for weight gain was 2.05 and 2.19 Cal./g. for male White Rock and female 2--8-week old Leghorn chicks, respectively. The amino acid requirements of growing broiler chicks were calculated from the maintenance requirements, body weight gain and body weight, the proportions of feather protein in total body protein, and the amino acid composition of carcass and feathers. The requirements thus calculated, correlated well with various values in the literature. Diets formulated on the basis of the present model, were lower in protein and amino acid contents than those formulated on the basis of NRC allowances. These differences were pronounced in diets designed for 6--8 week old chicks. The weight gains obtained were similar for both types of diets. Feed conversion were slightly poorer and abdominal fat higher in chicks fed the model diets. It is concluded that the present model can serve, at least as an initial approach, to calculate the protein and amino acid requirements.

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Section: Discussionmentioning

confidence: 99%

Section: G Gmentioning

confidence: 99%

Section: G Gmentioning

confidence: 99%

mentioning

confidence: 99%

“…Recalculated from data ofLeveille et al (1960) and expressed as the amino acid requirement as a percentage of the protein requirement.…”

mentioning

confidence: 99%