Descrição do potencial de retenção de nitrogênio em frangas de postura por diferentes metodologias: mínima retenção

Silva, Edney Pereira da; Sakomura, Nilva Kazue; Bonato, Melina Aparecida; Donato, Daniella Carolina Zanardo; Peruzzi, Nelson José; Fernandes, João Batista Kochenborger

doi:10.1590/s0103-84782014000200022

Cited by 5 publications

(11 citation statements)

References 8 publications

(4 reference statements)

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“…Using the correction value of nitrogen losses in the feathers found by [33], [32] in their work using this correction could conclude that diferences between CP needs for maintenance between the two techniques, CS and NB, decreased fell from of 1.56: 1 for 1.28: 1, comparing CS: NB.…”

Section: Crude Protein: Methodologies and Requirementmentioning

confidence: 88%

“…In an atempt to elucidate this diference between the methodologies, [32] described the potential of nitrogen retention in laying pullets by analyzing the two techniques: CS and NB. The authors describe that excreted nitrogen measured in the BN technique does not seem to contain all possible physiological efects, except for amino acid oxidation, in relation to the CS technique.…”

Section: Crude Protein: Methodologies and Requirementmentioning

confidence: 99%

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Amino Acid for Japanese Quails: Methodologies and Nutritional Requirement

Vieira¹,

Costa²,

Lima³

et al. 2017

Amino Acid - New Insights and Roles in Plant and Animal

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The methodologies applied to chickens and laying hens, to determine the digestibility and requirement of protein and amino acids are used with quails, however, they need a more careful evaluation due to peculiarities inherent to the Coturnix genus, in order to provide consistent results. The nutritional requirements of the birds are determinate using the dose-response and the factorial method. Several mathematical models and techniques of diet formulation are allied to the dose-response method in determining nutritional requirements. The curvilinear (hyperbolic) models beter portray population behaviour in response to increasing nutrient doses in diets. The reading model, allow a beter estimation of the requirement, in relation to the mathematical models used in the dose-response method. The techniques of comparative slaughter and nitrogen balance are efective in determining the nutritional requirements of quails, however, the later need to be corrected by the loss of nitrogen in the feathers in determining the requirements of crude protein and amino acids for maintenance. The protein-free diet, coupled with the industrial amino acid supplementation, provides more robust digestibility values, since it more efectively predicts the endogenous excretion patern.

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Section: Crude Protein: Methodologies and Requirementmentioning

confidence: 88%

Section: Crude Protein: Methodologies and Requirementmentioning

confidence: 99%

Amino Acid for Japanese Quails: Methodologies and Nutritional Requirement

Vieira¹,

Costa²,

Lima³

et al. 2017

Amino Acid - New Insights and Roles in Plant and Animal

View full text Add to dashboard Cite

show abstract

“…The concept of maintenance has been defined as the state of balance between the intake of nutrients and their inevitable losses (Siqueira et al, 2011;Silva et al, 2014;Soares et al, 2019). That contributes to an understanding of the differences in responses between individuals of a population and enhances the requirements concept.…”

Section: Introductionmentioning

confidence: 99%

“…That contributes to an understanding of the differences in responses between individuals of a population and enhances the requirements concept. Different methodologies have been developed to estimate nitrogen and amino acid requirements for maintenance (Burnham and Gous, 1992;Siqueira et al, 2011;Samadi and Liebert, 2006;Dorigam et al, 2014;Dos Santos et al, 2014;Silva et al, 2014). Some of these studies employed procedures that use a nitrogen-free diet and assume a linear relationship between nitrogen balance (NB) and nitrogen intake (NI), but these procedures have been criticized in the literature (Samadi and Liebert, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…A negative NB is essential to estimate the maintenance requirement using the linear relationship between NB and NI. However, this procedure has been questioned because the deprivation of nitrogen or protein intake enhances the catabolism of body protein (Mitchell, 1924), and this physiological state does not correspond to practical farm conditions (Silva et al, 2014). Most maintenance requirements used in factorial models are assumed to vary with body weight or metabolic body weight (Lima et al, 2016;Reis et al, 2018;Silva et al, 2019;Melaré et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Alternative procedure for determining lysine maintenance requirement in poultry

Dorigam¹,

Silva²,

Sakomura³

et al. 2020

Revista Brasileira De Zootecnia

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Non-ruminants Full-length research article Alternative procedure for determining lysine maintenance requirement in poultry ABSTRACT-The objective with this study was to determine the lysine maintenance requirements (LMR) of male and female broilers as animal models. A total of 252 birds were used for nitrogen balance trials during three periods (I: 6-21, II: 22-37, and III: 38-53 days). Six lysine levels were used (2.76, 5.88, 8.99, 12.1, 15.2, and 18.3 g kg −1) with six replications. A control group also included, totalizing seven treatments for males and females for each assay. The experimental period was 15 days. The response variables included nitrogen intake (NI) and excretion (NEX), and their difference was assumed to be deposited as nitrogen. An exponential regression between NEX and lysine intake (LI) was fitted, and LMR was estimated when LI = 0. The daily values for LMR were 9.29, 33.4, and 40.2 mg BW 0.67 kg −1 for males and 9.36, 30.0, and 39.4 mg BW 0.67 kg −1 for females. The final value for both sexes were 10.1 (period I), 31.5 (period II), and 39.8 mg BW 0.67 kg −1 (period III). Expressed as body protein weight at maturity (BPm), the LMR were 172 and 148 (period I), 216 and 207 (period II), and 189 and 180 mg BPm 0.73 kg −1 (period III) for males and females, respectively. The results provided ranges of LMR values recommended in previous studies, validating this procedure. The procedure to estimate the requirements presented here provides new insights into the model of amino acid requirement estimations.

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Maintenance valine, isoleucine, and tryptophan requirements for poultry

et al. 2016

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Poultry maintenance requirements for valine, isoleucine, and tryptophan were measured by nitrogen balance using different unit systems. The nitrogen balance trial lasted 5 d with 48 h of fasting (with roosters receiving only water+sucrose) and the last 72 h for feeding and excreta collection. Forty grams of each diet first-limiting in valine, isoleucine, or tryptophan was fed by tube each day (3 d) to give a range of intakes from 0 to 101, 0 to 119, and 0 to 34 mg/kg BW d of valine, isoleucine, and tryptophan, respectively. A nitrogen-free diet containing energy, vitamins, and minerals, meeting the rooster requirements, was offered ad libitum during these three d. To confirm that the amino acids studied were limiting, a treatment was added with a control diet formulated by adding 0.24 g/kg of L-valine, 0.21 g/kg of L-isoleucine, and 0.10 g/kg of L-tryptophan to the diets with lower amino acid level. Excreta were collected during the last 3 d of the balance period and the nitrogen content of the excreta was analyzed. For each amino acid, a linear regression between nitrogen retention (NR) and amino acid intake was performed. The equations from linear regression were: NR=-98.6 (±10.1)+2.4 (±0.2)×Val, NR=-46.9 (±7.1)+2.3 (±0.1)×Ile, NR=-39.5 (±7.7)+7.3 (±0.4)×Trp; where Val, Ile, and Trp are the intakes of valine, isoleucine, and tryptophan in mg/kg body weight per d, respectively. The valine, isoleucine, and tryptophan required to maintain the body at zero NR were calculated to be 41, 20, and 5 mg/kg body weight per d, respectively. For the system unit mg per kg of metabolic weight, the intake of valine, isoleucine, and tryptophan was 59, 32, and 9, respectively. Considering the degree of maturity of the animal and body protein content (BPm (0.73)×u), the amounts of valine, isoleucine, and tryptophan required for maintenance were calculated to be 247, 134, and 37 mg per unit of maintenance protein (BPm (0.73)×u) per d. Maintenance requirement is more adequately expressed as body protein content.

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Descrição do potencial de retenção de nitrogênio em frangas de postura por diferentes metodologias: mínima retenção

Cited by 5 publications

References 8 publications

Amino Acid for Japanese Quails: Methodologies and Nutritional Requirement

Amino Acid for Japanese Quails: Methodologies and Nutritional Requirement

Alternative procedure for determining lysine maintenance requirement in poultry

Maintenance valine, isoleucine, and tryptophan requirements for poultry

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