Influence of level of feed input and procedure on metabolisable energy and endogenous energy loss (EEL) with adult cockerels

Yaghobfar, Akbar; Boldaji, F.

doi:10.1080/0007166021000025091

Cited by 16 publications

(14 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Our data showed the opposite-that methods which fail to control for among-bird variation consistently lead to a minor decrease in measured precision of TME estimates. Poultry studies in particular have capitalized on the flexibility of this estimator with regard to sample size variation between starved and fed birds (e.g., Yaghobfar and Boldaji 2002) and the ability to apply a single group mean to multiple groups of fed birds Ragland et al 1997Ragland et al , 1999. However, little effort has gone toward determining how many birds are required to obtain an accurate mean estimate of EL, and few studies have acknowledged the consequences of using unreplicated control groups in Group Mean Correction (Fig.…”

Section: Comparison Of Methodsmentioning

confidence: 99%

“…Rather, the favored approach is Group Mean Correction, which is often implemented with one mean value of EL being applied to multiple treatment groups of birds fed different test diets ( Fig. 1D; King et al 1997;Ragland et al 1997Ragland et al , 1999Villamide and San Juan 1998;Farran et al 2001;Hong et al 2001;Yaghobfar 2001;Yaghobfar and Boldaji 2002;Song et al 2003). Consequently, the standard that has emerged in the literature on both domestic and wild species is inconsistent, with the available empirical evidence suggesting that Self Correction should be favored.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Does choice of estimators influence conclusions from true metabolizable energy feeding trials?

2005

View full text Add to dashboard Cite

True metabolizable energy (TME) is a measure of avian dietary quality that accounts for metabolic fecal and endogenous urinary energy losses (EL) of non-dietary origin. The TME is calculated using a bird fed the test diet and an estimate of EL derived from another bird (Paired Bird Correction), the same bird (Self Correction), or several other birds (Group Mean Correction). We evaluated precision of these estimators by using each to calculate TME of three seed diets in bluewinged teal (Anas discors). The TME varied by <2% among estimators for all three diets, and Self Correction produced the least variable TMEs for each. The TME did not differ between estimators in nine paired comparisons within diets, but variation between estimators within individual birds was sufficient to be of practical consequence. Although differences in precision among methods were slight, Self Correction required the lowest sample size to achieve a given precision. Feeding trial methods that minimize variation among individuals have several desirable properties, including higher precision of TME estimates and more rigorous experimental control. Consequently, we believe that Self Correction is most likely to accurately represent nutritional value of food items and should be considered the standard method for TME feeding trials.

show abstract

Section: Comparison Of Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Does choice of estimators influence conclusions from true metabolizable energy feeding trials?

2005

View full text Add to dashboard Cite

show abstract

“…Na Tabela 2 também se pode notar que a disponibilidade da matéria mineral e a digestibilidade da proteína das rações RFS, RFM e RMP, propiciaram menores valores quando comparados à ração RLE e RCO. Torna-se evidente a resposta significativa das aves à qualidade e quantidade de fibra, pois ao alterar a viscosidade da digesta, alteram-se as perdas endógenas, especialmente nitrogênio (Yaghobfar & Boldaji 2002;Dilger et al, 2004). Além disso, houve possível efeito de fatores antinutricionais não atenuados pela fenação, ou seja, fitatos que agem de forma quelatante com minerais e taninos que agem de forma adstringente sobre as enzimas (Oliveira et al, 2000;Ramos et al, 2007;Araújo Filho et al, 2009).…”

Section: Resultsunclassified

Digestibility of rations with forage hays for Isa Label cocks

Silva

Fernandes

Arruda

et al. 2014

AVB

View full text Add to dashboard Cite

RESUMO -A valorização do milho e da soja eleva o custo de produção avícola industrial de tal maneira a motivar intensamente alternativas alimentares viáveis ao sistema de produção. Objetivou-se avaliar a digestibilidade aparente dos nutrientes e valor energético de rações contendo feno de forrageiras para galos Isa Label. Foram utilizados 60 galos distribuídos inteiramente ao acaso em gaiolas adaptadas para coleta total de excretas. Os tratamentos foram elaborados a partir de uma ração controle (RCO) e outras quatro rações testes contendo um nível de substituição de 20% (kg/kg) para cada feno de forrageira: flor de seda (RFS), folhas de mandioca (RFM), mata pasto (RMP) ou leucena (RLE). Os maiores coeficientes de digestibilidade foram obtidos com a ração RCO. Entre os fenos de forrageiras, a digestibilidade da proteína bruta foi superior para ração RLE (77,94%) e inferior para ração RFS (59,95%). Entre as forrageiras, a digestibilidade da fração fibrosa (FDN e FDA) foi melhor para ração RLE (36,70 e 26,27%) e menor para ração RFS (22,45 e 12,36%), enquanto para digestibilidade da energia bruta o melhor resultado foi verificado com ração RLE (69,26%) e menor valor com a ração RFS (58,02%). Os valores de energia metabolizável aparente (kcal/kg) dos fenos foram de 733,19 para RFS; de 1592,17 para RMP; de 1650,92 para RFM; e de 1868,60 para RLE. Os fenos das forrageiras leucena e folhas de mandioca podem ser recomendados para aves caipiras, devendo o uso do mata pasto ser restrito e inapropriado para a flor de seda.Palavras-Chave: alimentos fibrosos; avicultura caipira; nutrição de monogástricos. ABSTRACT -The mercantilist appreciation of corn and soybean has increased the cost of poultry production so intensely motivating food alternatives that will be viable to the poultry system. Thus, the objective was to evaluate the apparent digestibility of nutrients and energy value of raions containing forage hays for Isa Label cocks. A total of 60 cocks were used in completely randomized design in cages suitable for collection of excreta. The treatments were prepared from a control ration (RCO) which allowed the formulation of other four test rations containing a replacement level of 20% (kg / kg) for each forage hay: leucaena (RLE), kills pasture (RMP) , silk flower (RFS) or cassava leaves (RFM). The highest digestibility of nutrients was obtained with RCO ration. Among the forages hays, digestibility of crude protein was higher to RLE ration (77.94%) and lower for RFS ration (59.95%). Among the forages hays, the digestibility of neutral and acid detergent fiber (NDF and ADF) was higher for RLE ration (36.70 and 26.27%) and lowest for RFS ration (22.45 and 12.36%), while the digestibility of gross energy the best result was observed with RLE ration (69.26%) and lowest with the RFS ration (58.02%). The apparent metabolizable energy (kcal / kg) of forages hays were 733.19 for silk flower, 1592.17 for kills pasture; 1650.92 for cassava leaves, and 1868.60 for leucaena. The forages of leucaena and cassava leaves can be recomm...

show abstract

“…Light program was provided with 16 h of light per day from 7 am to 23 pm (50 to 64 weeks). The pattern of total and digestible amino acids and also nitrogen corrected apparent and true metabolizable energy were determined for feedstuffs Boldaji, 2002, Yaghobfar andZahedifar, 2003). Diets were adjusted based on the requirements of Arian broiler breeder (Manual, 2002) at two levels of the total and digestible amino acids requirements.…”

Section: Methodsmentioning

confidence: 99%

Effects of amino acids and metabolizable energy on egg characteristics and broiler breeder performance

Nasr¹,

Yaghobfar²,

Ebrahimnezhad³

et al. 2011

Afr. J. Biotechnol.

View full text Add to dashboard Cite

A study was conducted to determine the effects of diet formulation type on egg characteristics and reproductive performance of broiler breeder (50 to 64 weeks of age). 140 female and 20 male breeders in four treatments with five replicates (7 females : 1 male) were used in the randomized 2 × 2 factorial design. Four experimental diets were formulated based on two factors: two levels of apparent and true metabolizable energy corrected for nitrogen of feedstuffs (AMEn and TMEn) and two levels of total amino acids (TAAF) and digestible (DAAF) feedstuffs. The results show that egg weight, egg production, fertility and hatchability were significantly different and affected by diet formulation based on energy (P<0.05). Diet formulation based on digestible amino acids of feedstuffs significantly increased albumen height and Haugh unit (HU). Hens on treatment 2 (AMEn + DAAF) were significantly different in egg weight (69.17 g), egg production (62.45%) and chicks/hen (40.23) (P<0.05). This study shows that the diets formulations for AMEn, TMEn, TAAF and DAAF have significant effects on egg characteristics and broiler breeders reproductive performance.

show abstract

Influence of level of feed input and procedure on metabolisable energy and endogenous energy loss (EEL) with adult cockerels

Cited by 16 publications

References 9 publications

Does choice of estimators influence conclusions from true metabolizable energy feeding trials?

Does choice of estimators influence conclusions from true metabolizable energy feeding trials?

Digestibility of rations with forage hays for Isa Label cocks

Effects of amino acids and metabolizable energy on egg characteristics and broiler breeder performance

Contact Info

Product

Resources

About