Exigências nutricionais de proteína, energia e macrominerais de bovinos Nelore de três classes sexuais

Marcondes, Marcos Inácio; Filho, Sebastião de Campos Valadares; Paulino, Pedro Veiga Rodrigues; Valadares, Rilene Ferreira Diniz; Paulino, Mário Fonseca; Nascimento, Fernando Barros; Fonseca, Mozart Alves

doi:10.1590/s1516-35982009000800025

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…The efficiency of using metabolizable energy for weight gain found in this study was lower than the 45% found by Marcondes et al (2009), working on Nellore of three sex classes (integrate males, castrated males and females). Tedeschi et al (2002) found values of 45.9 and 49.7% for castrated and integrated males of Nellore, respectively.…”

Section: Resultscontrasting

confidence: 87%

Energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios

et al. 2012

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-The objective of this study was to determine the energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two levels of concentrate. Sixty heifers from three genetic groups were used: 20 Nellore, 20 Nellore × Angus and 20 Nellore × Simmental. Twelve belonged to the reference group (four of each genetic group) and were slaughtered at the beginning of the experiment. Another 12 heifers (four of each genetic group) were fed on the maintenance level and 36 heifers (12 animals of each genetic group) were kept in feeding system ad libitum with 30 (six in each group) or 50% (six of each group) dry matter concentrate. Animals were randomly assigned to six treatments in a 3 × 2 factorial arrangement (three genetic groups and two diets) with six replicates per treatment. Nine more heifers were used in a parallel experiment to estimate the apparent digestibility coefficients (three from each genetic group). Net energy requirements were estimated by the equation of retained energy as a function of metabolic empty body weight (EBW 0.75 ) and empty body weight gain (EBWg). Requirements of metabolizable and net energy were estimated for maintenance by the equation of heat production as a function of metabolizable energy intake. Using the combined equation RE (retained energy; Mcal/day) = 0.0703 × EBW .75 × EBWg 1.128 to predict net energy requirements for weight gain is recommended. The requirement of metabolizable and net energy for maintenance of all groups is 70.55 and 106.53 kcal/kgEBW 0.75 /day, respectively. Use efficiencies of metabolizable energy for gain and maintenance are 36.41 and 66.23%, for the three genetic groups respectively.

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Section: Resultscontrasting

confidence: 87%

Energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios

et al. 2012

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“…Marcondes et al (2009a), utilizando animais Nelore de três classes sexuais e alimentação à base de silagem de milho, milho moído e farelo de soja, encontraram uma eficiência de uso da proteina metabolizável para ganho de 50%, semelhante à sugerida pelo NRC (2000), dando suporte às discussões feitas acima.…”

Section: Nelore-simentalunclassified

Exigências de proteína de animais Nelore puros e cruzados com as raças Angus e Simental

et al. 2011

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RESUMO -Objetivou-se estimar as exigências de proteína de animais Nelore, Nelore-Angus e Nelore-Simental, assim como a eficiência de uso da proteína metabolizável para ganho. Foram utilizados 69 animais (23 Nelore, 23 Nelore-Angus e 23 Nelore-Simental): 12 (quatro de cada grupo genético) foram abatidos antes do início do experimento, como grupo-referência, e nove animais foram separados para um ensaio de digestibilidade. Os animais restantes foram divididos em três dietas (ofertas de concentrado na base de 1 ou 2% do peso corporal à vontade e 1% do nível de mantença). Ao final do experimento, todos os animais foram abatidos e a composição corporal e o peso de corpo vazio (PCVZ) determinados. O consumo de proteína metabolizável (CP met ) foi estimado pela proteína microbiana verdadeira digestível média somada à proteína digestível não-degradada no rúmen. As exigências líquidas de proteína para ganho foram estimadas pela proteína retida (PR) em função do ganho de PCVZ (GPCVZ) e da energia retida. As exigências de proteína metabolizável para mantença foram estimadas pelo CP met em função do GMD e as exigências líquidas para mantença pela PR em função do CP met . O grupo genético influenciou apenas a relação entre os diferentes ganhos, mas não teve efeito sobre as exigências líquidas de proteína para ganho, que podem ser estimadas por meio do modelo PR = GPCVZ × (238,5 -16,73 × (ER/GPCVZ)). Não há influência de grupo genético sobre as exigências líquidas e metabolizáveis de proteína para mantença, cujos valores são de 1,72 g/PCVZ 0,75 e 3,09 g/PC 0,75 , respectivamente. Também não há efeito de grupo genético na energia retida em forma de proteína, assim como na eficiência de uso da proteína metabolizável para ganho, que é de 37,5%.Palavras-chave: cruzamento industrial, eficiência de uso da proteína, exigências, proteína líquida, proteína metabolizável, terminação Protein requirements of Nellore cattle and Nellore crossbred with Angus and SimmentalABSTRACT -The objective was to estimate the protein requirements of Nellore, Nellore × Angus and Nellore × Simmental cattle, as well as efficiency of metabolizable protein for gain. Sixty-nine animals (23 Nellore, 23 Nellore × Angus and 23 Nellore × Simmental) were used, with 12 animals (four of each genetic group) slaughtered before the beginning of the experiment as the baseline group, and nine split for the performance of digestibility trial. The remaining animals were divided in three diets (concentrate offer of 1 or 2% of body weight and maintenance). At the end of the experiment, all animals were slaughtered and their corporal composition and empty body weight (EBW) were determined. The metabolizable protein intake (MPI) was estimated by the mean digestible microbial protein summed to digestibile rumen undegradable protein. The net protein requirements were estimated as retained protein by the retained energy (RE) and empty body gain (EBG). The requirements of metabolizable protein for maintenance were estimated as the MPI as function of average daily gain, and the ne...

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“…Nevertheless, the majority of the animals on the database utilized were in the finishing phase (Chizzotti et al, 2007;Marcondes et al, 2009;Souza et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Energy and protein nutritional requirements for Nellore bulls

Silva¹,

Filho²,

Zanetti³

et al. 2012

R. Bras. Zootec.

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-The objective of this study was to determine the nutritional requirements of energy and protein and estimate the efficiencies of metabolizable energy utilization for fat and protein deposition, as well as for maintenance (k m ) and growth (k g ). An experiment of comparative slaughter was carried out with thirty-seven 14-month-old (±1 month) Nellore bulls with 259±24.9 kg. Animals were divided as follows: five to reference, four to maintenance level and twentyeight bulls feeding ad libitum. Bulls were also grouped in 4 different feedlot periods (42, 84, 126 and 168 days) for slaughter.The diet was composed of corn silage and concentrate, at a 55:45 ratio. After the slaughter, the left half carcasses were totally dissected for determination of body composition. The energy requirements for maintenance were obtained by exponentially relating the heat production and the metabolizable energy intake, while the energy requirements for gain (NE g ) were obtained according to empty body weight (EBW) and EBW gain (EBG). The net protein requirements for gain (NP g ) were estimated according to EBG and retained energy (RE). The net (NE m ) and metabolizable (ME m ) energy requirements for maintenance

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Exigências nutricionais de proteína, energia e macrominerais de bovinos Nelore de três classes sexuais

Cited by 11 publications

References 13 publications

Energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios

Energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios

Exigências de proteína de animais Nelore puros e cruzados com as raças Angus e Simental

Energy and protein nutritional requirements for Nellore bulls

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