A decision support system to improve individual cattle management. 1. A mechanistic, dynamic model for animal growth

Tedeschi, L. O.; Fox, D. G.; Guiroy, P. J.

doi:10.1016/s0308-521x(03)00070-2

Cited by 131 publications

(123 citation statements)

References 54 publications

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“…The model obtained was RE p = 2.4221 × (RE/EBG) -1.6472 , where RE p is the energy retained in the form of protein; RE is the retained energy, in Mcal/day; and EBG is the empty body weight gain, in kg/day. The RE p can be utilized in the conversion of net energy into metabolizable energy for being directly correlated with the utilization efficiency of metabolizable energy for gain (Willians & Jenkins, 2003;Tedeschi, 2004). Marcondes et al (2010) utilized a database of 752 animals raised in Brazilian conditions and did not observe differences between genders or between Nellore and crossbred animals for RE p , which was equal to 1.140 × (RE/EBG) -1.137 .…”

Section: Resultsmentioning

confidence: 99%

“…Some authors (Tedeschi et al, 2002;Tedeschi et al, 2004;Chizzotti et al, 2008) suggested that in order to estimate the energy requirements for maintenance, the exponential method is the most suitable. Thus, the net energy requirement for maintenance (Mcal/EBW 0.75 /day) was calculated from the intercept (β 0 ) of the exponential regression between HP and MEI.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Energy and protein nutritional requirements for Nellore bulls

Silva¹,

Filho²,

Zanetti³

et al. 2012

R. Bras. Zootec.

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“…The experiment was designed to harvest all finished cattle when FT was visually estimated to be 1.27 cm. However, because of the imprecision of the estimation, cattle were harvested at differing degrees of FT. To account for differences in performance caused by dissimilar management among treatments FT, HCW and marbling must be adjusted to a common harvest endpoint (Guiroy et al, 2002;Tedeschi et al, 2004). Cattle from this study were compared at similar harvest endpoint following the procedure described by Griffin et al (2007).…”

Section: Weaned Calf Managementmentioning

confidence: 99%

Calving date and wintering system effects on cow and calf performance I: A systems approach to beef production in the Nebraska Sandhills

Pas

Stalker

Adams

et al. 2012

The Professional Animal Scientist

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“…De acordo com o modelo proposto por Tedeschi et al (2004), trabalhando com dados de animais taurinos, esse valor seria de 5,54% e de acordo com Chizzotti et al (2008), utilizando zebuínos puros e cruzados, a proporção de proteína no ganho de energia seria de 10,1%. Dessa forma, observou-se que os animais Nelore-Angus encontravam em fase de maturidade mais avançada em relação aos demais e, de acordo com Geay (1984), a proporção de proteína no ganho cai linearmente com o aumento da deposição de energia.…”

Section: Nelore-simentalunclassified

“…Utilizando-se as equações adotadas por Tedeschi et al (2004) Wikerson et al (1993), como o intercepto do consumo de proteína metabolizável (g/dia) em função do ganho médio diário (kg/dia), dividido pelo peso metabólico médio dos animais daqueles trabalhos.…”

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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A decision support system to improve individual cattle management. 1. A mechanistic, dynamic model for animal growth

Cited by 131 publications

References 54 publications

Energy and protein nutritional requirements for Nellore bulls

Energy and protein nutritional requirements for Nellore bulls

Calving date and wintering system effects on cow and calf performance I: A systems approach to beef production in the Nebraska Sandhills

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

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