Re-evaluation of requirement of Calcium and available Phosphorus for starting meat-type chicks.

Yoshida, Minoru; Hoshii, Hiroshi

doi:10.2141/jpsa.19.101

Cited by 16 publications

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“…And these two criteria increased quadratically as dietary Ca increased, which is in line with the results reported by Bar et al [ 10 ]. However, some previous studies showed that the Ca requirement (1.3%) based on bone ash contents of 21-d-old broilers was higher than the current NRC Ca requirement (1.00%) [ 6 , 45 ], which might be due to the high dietary P levels (from 0.7 to 0.75%) in these studies. Shafey [ 46 ] reported that increasing dietary Ca enhanced the breaking strength of cockerel tibia.…”

Section: Discussioncontrasting

confidence: 58%

“…In earlier studies, growth performance was often used to assess Ca requirements of broilers [ 6 , 13 ]. In order to maximize the growth performance of broilers, using diets with 0.6% Ca becomes more widespread [ 2 ].…”

Section: Discussionmentioning

confidence: 99%

“…The current Ca recommendations for broilers by NRC (1994) [ 4 ] were 1.00%, 0.90%, and 0.80% for the starter (1 to 21 d), grower (22 to 42 d), and finisher (43 to 56 d) phases, respectively. However, these recommendations are based on studies conducted in 1960s and 1980s [ 5 , 6 ], and the response indicators in these studies are mainly growth performance and bone ash percentage. The modern broilers differ very much from those before 1980s in the growth rate, feed conversion efficiency, carcass quality and bone characteristics [ 7 – 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age

Bai

Yang

et al. 2022

J Animal Sci Biotechnol

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Background The current calcium (Ca) recommendation for broilers is primarily based on studies conducted more than 30 years ago with birds of markedly different productive potentials from those which exist today. And the response indicators in these studies are mainly growth performance and bone ash percentage. Therefore, the present study was carried out to investigate the effect of dietary Ca level on growth performance, serum parameters, bone characteristics and Ca metabolism-related gene expressions, so as to estimate dietary Ca requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age. Methods A total of 420 1-day-old Arbor Acres male broilers were randomly assigned to 1 of 7 treatments with 6 replicates (10 birds per cage) and fed the corn-soybean meal diets containing 0.60%, 0.70%, 0.80%, 0.90%, 1.00%, 1.10% or 1.20% Ca for 21 days. Each diet contained the constant non-phytate phosphorus content of about 0.39%. Results The average daily gain decreased linearly (P < 0.001) as dietary Ca level increased. The serum and tibia alkaline phosphatase (ALP) activities, tibia bone mineral density (BMD), middle toe BMD, tibia ash percentage, tibia breaking strength, and tibia ALP protein expression level were affected (P < 0.05) by dietary Ca level, and showed significant quadratic responses (P < 0.02) to dietary Ca levels. The estimates of dietary Ca requirements were 0.80 to 1.00% based on the best fitted broken-line or quadratic models (P < 0.03) of the above serum and bone parameters, respectively. Conclusions The results from the present study indicate that the Ca requirements would be about 0.60% to obtain the best growth rate, and 1.00% to meet all of the Ca metabolisms and bone development of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age.

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Section: Discussioncontrasting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age

Bai

Yang

et al. 2022

J Animal Sci Biotechnol

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“…And these two criteria increased quadratically as dietary Ca increased, which is in line with the results reported by Bar et al (2003) [10]. However, some previous studies (Yoshida and Hoshii, 1982;Hurwitz et al, 1995) showed that the Ca requirement (1.3%) based on bone ash contents of 21-d-old broilers was higher than the current NRC Ca requirement (1.00%) [6,45], which might be due to the high dietary P levels (0.7 ~ 0.75%) in these studies. Shafey (1993) [15,38], which is similar to the results from the present experiment.…”

Section: Discussionsupporting

confidence: 90%

Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 d of age

Bai

Yang

et al. 2021

Preprint

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Background The current calcium (Ca) recommendation for broilers is primarily based on studies conducted more than 30 years ago with birds of markedly different productive potentials from those which exist today. And the response indicators in these studies are mainly growth performance and bone ash percentage. Therefore, the present study was carried out to investigate the effect of dietary Ca level on growth performance, serum parameters, bone characteristics and Ca metabolism-related gene expressions, so as to estimate dietary Ca requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 d of age. Methods A total of 420 1-day-old Arbor Acres male broilers were randomly assigned to 1 of 7 treatments with 6 replicates (10 birds per cage) and fed the corn-soybean meal diets containing 0.60, 0.70, 0.80, 0.90, 1.00, 1.10 or 1.20% Ca for 21days. Each diet contained the constant non-phytate phosphorus content of about 0.39%. Results The average daily gain decreased linearly (P < 0.001) as dietary Ca level increased. The serum and tibia alkaline phosphatase (ALP) activities, tibia bone mineral density (BMD), middle toe BMD, tibia ash percentage, tibia breaking strength, and tibia ALP protein expression level were affected (P < 0.05) by dietary Ca level, and showed significant quadratic responses (P < 0.02) to dietary Ca levels. The estimates of dietary Ca requirements were 0.80 to 1.00% based on the best fitted broken-line or quadratic models (P < 0.03) of the above serum and bone parameters, respectively. Conclusions The results from the present study indicate that the Ca requirements would be about 0.60% to obtain the best growth rate, and 1.00% to meet all of the Ca metabolisms and bone development of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age.

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“…Yoshida & Hoshii (1982) reportaram que 1,1% de cálcio e 0,35% de fósforo são necessários para otimizar a deposição de cinzas nos ossos, em frangos de corte de 4 a 8 semanas de idade. Contudo, Cabral (1999) reportou que o teor de cinzas no fêmur foi afetado pelo nível de cálcio dietético apenas para frangos de corte machos, no período de 43 a 53 dias de idade.…”

Section: Experimento 2 -Exigência Nutricional De Cálcio Para Frangos unclassified

Exigência nutricional de cálcio para frangos de corte, nas fases de crescimento e terminação

et al. 2004

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RESUMO -Foram conduzidos dois experimentos com o objetivo de determinar a exigência nutricional de cálcio para frangos de corte de 22 a 42 e 43 a 53 dias de idade. Em cada experimento foram utilizados 360 frangos de corte da linhagem Avian Farm, sendo 180 machos e 180 fêmeas. O primeiro ensaio teve duração de 21 dias e o segundo, de 10 dias, sendo que em ambos o delineamento experimental adotado foi o inteiramente casualizado, com seis tratamentos e seis repetições, sendo a unidade experimental representada pelo box, contendo cinco machos e cinco fêmeas. Foram formuladas duas dietas basais constituídas de milho e farelo de soja, suplementadas com vitaminas e minerais, atendendo as exigências nutricionais das aves, com exceção do cálcio, que permaneceu deficiente no nível de 0,16%. Os tratamentos, em cada experimento, foram constituídos da suplementação das dietas basais com 0,0; 0,25; 0,50; 0,75; 1,00; e 1,25% de cálcio provenientes do carbonato de cálcio, resultando nos níveis de 0,16; 0,41; 0,66; 0,91; 1,16; e 1,41% de cálcio. Com o término de cada experimento, foram abatidas 72 aves (duas aves por box), para extração das tíbias, visando à medição da resistência à quebra e análises de cálcio e cinzas nos ossos. Os valores da exigência de cálcio foram estimados por intermédio de ganho de peso, conversão alimentar, teores de cálcio e cinzas nos ossos (em porcentagem e em gramas) e resistência à quebra dos ossos, utilizando-se os modelos de regressão linear e/ou quadrática. De acordo com as respostas biológicas das aves frente aos níveis de cálcio estudados, sugerem-se os valores de 1,02 e 1,01% de cálcio como a exigência para frangos de corte de 22 a 42 e 43 a 53 dias de idade, respectivamente. Contudo, levando-se em consideração a resistência à quebra óssea, a exigência de cálcio para frangos de corte de 22 a 42 e 43 a 53 dias de idade seria de 1,28 e 1,18%, respectivamente. Palavras-chave: requerimento de cálcio, desempenho, ossos, frango de corte Calcium Requirement for Broiler Chicks from 22 to 42 and 43 to 53 Days OldABSTRACT -Two experiments were carried out to determine the nutritional requirement of calcium for broilers in growing (22 to 42 days), and finishing (43 to 53 days) phases. Three hundred and sixty Avian Farm broiler chicks (180 from each sex) were used in both trails. The first experiment lasted 21 days and the second one, 10 days. A completely randomized design was used in both experiments, with six treatments, six replications and 10 birds per experimental unity (five males and five females). Two basal diets were formulated to meet the birds nutritional requirements, except for the calcium, that remained deficient at the level of 0.16%. The basal diets in each experiment were supplemented with 0.0, 0.25, 0.50, 0.75, 1.00, and 1.25% calcium from calcium carbonate, resulting in the levels of 0. 16, 0.41, 0.66, 0.91, 1.16 and 1.41% of calcium, and the treatments were used to estimated the calcium requirements of broilers. At the end of each experiment, 72 birds were sacrificed by cervical disl...

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Re-evaluation of requirement of Calcium and available Phosphorus for starting meat-type chicks.

Cited by 16 publications

References 0 publications

Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age

Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 days of age

Dietary calcium requirements of broilers fed a conventional corn-soybean meal diet from 1 to 21 d of age

Exigência nutricional de cálcio para frangos de corte, nas fases de crescimento e terminação

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