Effect of dietary protein content on growth and body composition of fast and slow feathering broiler chickens

Ajang, O. A.; Prijono, Siti Nuramaliati; Smith, William K.

doi:10.1080/00071669308417564

Cited by 38 publications

(14 citation statements)

References 14 publications

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“…Carcass DM content in the modern strain birds was significantly higher than in previous genotypes [62] Finally, energy and protein supply as well as dietary AA balance impact on DM content of the feather-free or total body of broiler chickens [42] [67]- [73], but eliminated in the current study by standardized diets.…”

Section: Discussionmentioning

confidence: 97%

Age and Gender Depending Growth of Feathers and Feather-Free Body in Modern Fast Growing Meat-Type Chickens

Wecke¹,

Khan²,

Sünder³

et al. 2017

OJAS

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Two growth experiments with fast growing meat type chickens (Ross 308) were conducted to assess the growth of feathers and feather-free body dependent on age and gender (male:female ratio = 1:1). Birds were reared under uniform management and feeding conditions (floor pens; 15 pens per gender; 5 birds per pen) during the starter (day 1 to 22) and grower period (day 22 to 36). Diets were based on corn, wheat, soybean meal, soybean protein concentrate and balanced with feed amino acids to ensure an equal feed protein quality close to the ideal amino acid ratio by a constant mixture of the feed proteins. At start of the experiment and further on weekly up to the end of the 5 th week, 15 birds per gender (each 3 pens of 5 birds) were selected and 24 h fasted before quantitative de-feathering. Both feather and feather free body fractions were significantly increased with increasing age of the birds (p < 0.001). Feather percentage as related to the empty body weight increased non-linearly from approximately 2% at the end of the first week to about 4% at the end of the experiment. Feather percentage and dry matter content of the feather-free body was significantly higher in female birds (p < 0.001) as compared to males. Further investigations will show how this varying proportions impact on nutrient deposition of modern meat-type chickens dependent on age and gender, respectively.

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Section: Discussionmentioning

confidence: 97%

Age and Gender Depending Growth of Feathers and Feather-Free Body in Modern Fast Growing Meat-Type Chickens

Wecke¹,

Khan²,

Sünder³

et al. 2017

OJAS

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“…Isso, provavelmente, se deve à maior velocidade de empenamento das fêmeas em relação aos machos, necessitando, portanto, de maiores teores de cistina, os quais podem ser adquiridos da metionina pela conversão metabólica. AJANG et al (1993), PESTI et al (1996) e Bordas, citado por COLNAGO (1996), sugerem que a velocidade de empenamento pode influenciar a exigência de proteína e aminoácidos sulfurosos. Existe, entretanto, a possibilidade de adotar 0,870% de Met+Cis, por se apresentar como melhor valor biológico diante da variável em questão.…”

Section: Efeito Dos Níveis De Metionina+cistina (Met+cisunclassified

Exigência de metionina + cistina para frangos de corte na fase de crescimento e acabamento

Rodrigueiro¹,

Albino²,

Rostagno³

et al. 2000

R. Bras. Zootec.

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RESUMO -Com o objetivo de determinar as exigências de metionina+cistina, foram utilizados 1440 e 1080 frangos de corte da marca comercial Hubbard, 50% de cada sexo, para as fases de crescimento e acabamento, respectivamente. Seis níveis de suplementação de 0; 0,06, 0,12; 0,18; 0,24; e 0,30%) foram adicionados às rações basais deficientes em metionina+cistina. Foram avaliados, aos 22-42 e 43-56 dias, ganho de peso, consumo de ração, conversão alimentar, rendimento e composição química da carcaça, gordura abdominal e concentração plasmática de ácido úrico. Com base nas análises estatística e nos parâmetros estudados durante a fase de crescimento (22 a 42 dias de idade), sugere-se utilizar 0,896 e 0,856% de metionina+cistina total para machos e fêmeas, respectivamente. Para a fase de acabamento (43 a 56 dias de idade), com base nas análises estatísticas e nos parâmetros estudados, sugere-se utilizar 0,764 e 0,740% de metionina+cistina total para machos e fêmeas, respectivamente.Palavras-chave: composição da carcaça, desempenho, exigência de metionina+cistina, frangos de corte, rendimento de carcaça Methionine+Cystine Requirement for Broilers at the Growing and Finishing PhasesABSTRACT -With the objective to determine the methionine+cystine requirements, 1440 and 1080 commercial Hubbard broilers were used, 50% of each sex at the growing and finishing phases, respectively. Six supplemental levels of DL-methionine (.0, .06, .12, .18, .24, and .30%) were added to methionine+cystine deficient basal diets. Body weight gain, feed intake, feed:gain ratio, carcass yield and composition, abdominal fat and plasma uric acid concentration were evaluated from 22-42 and 43-56 days of age. Based on the statistical analysis of the studied parameters during the growing phase (22 to 42 days of age), it is suggested to use .896 and .856% of total methionine+cystine for males and females, respectively. For the finishing phase (43 to 56 days of age), based in the statistic analysis and in the studied parameters, it is suggested to use .764% and .740% of total methionine+cystine for males and females, respectively.

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“…Further, reduction in feathers spares valuable protein which is turned into meat tissues. (Ajang et al, 1993).…”

Section: Heat Stress and Broiler Performancementioning

confidence: 99%

Naked Neck: A Noble Gene for Broiler Production in Tropical Climate

Singh

Chaudhuri

et al. 1998

Journal of Applied Animal Research

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Effect of dietary protein content on growth and body composition of fast and slow feathering broiler chickens

Cited by 38 publications

References 14 publications

Age and Gender Depending Growth of Feathers and Feather-Free Body in Modern Fast Growing Meat-Type Chickens

Age and Gender Depending Growth of Feathers and Feather-Free Body in Modern Fast Growing Meat-Type Chickens

Exigência de metionina + cistina para frangos de corte na fase de crescimento e acabamento

Naked Neck: A Noble Gene for Broiler Production in Tropical Climate

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