Growth patterns of Nellore vs British beef cattle breeds assessed using a dynamic, mechanistic model of cattle growth and composition.

Sainz, R. D.; Barioni, L. G.; Paulino, Pedro Veiga Rodrigues; Filho, S. C. Valadares; Oltjen, J. W.; Kebreab, E.; Dijkstra, J.; Bannink, A.; Gerrits, W.J.J.

doi:10.1079/9781845930059.0160

Cited by 16 publications

(17 citation statements)

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“…According to Sainz et al (2006), there are studies reporting that lower post-mortem muscle proteolysis of Zebu animals, due to a greater activity of calpastatin, indicate that the protein turnover of Zebu animals is smaller than Taurus, which contribute for them to present smaller energy consumption inasmuch as the recycling body protein is a major component of energy expenditure involved in maintenance.…”

Section: Resultsmentioning

confidence: 99%

Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture

et al. 2012

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-The objective of this study was to estimate requirements of energy, protein and macrominerals of young Nellore/Holstein crossbreds bulls supplemented on pastures of Brachiaria decumbens Stapf. Thirty-five young bulls, at 8.53±0.18 months of age and with initial body weight of 230.6±6.1 kg were used. Ten animals were slaughtered as reference, in different weight range, and the other animals were slaughtered at the end of the experimental period. For estimate of net energy requirements for weight, a regression equation between log of retained energy (RE) and log of empty body weight gain (EBWG) was constructed. Net requirements of Ca, P, Mg, Na and K were determined by the equation Y' = a.b.X b-1 , in which a and b represent the intercept and the coefficient of equation of prediction of macrominerals in body content, respectively.Requirements of metabolizable energy for maintenance (MEm) were obtained from retained energy in function of metabolizable energy intake (MEI). The requirements of MEm of Nellore/Holstein crossbreds young bulls on pasture was 125 kcal/EBW 0.75 /day. The efficiency of ME utilization for maintenance (k m ) of grazing Nellore/Holstein crossbred young bulls was 0.58 and 0.24 for gain. The total metabolizable protein requirements for an animal with 400 kg and with average daily gain of 1.0 kg, were 638.36 g/day. The dietetic requirements of Ca and P for an animal with 400 kg BW were 0.49 and 0.21% of DM, respectively. Daily metabolizable energy requirement for maintenance of grazing Nellore/Holstein crossbred young bulls was 11.6% greater than the values found for cattle in feedlot in Brazil (112 kcal/kg EBW 0.75 ).

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Section: Resultsmentioning

confidence: 99%

Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture

et al. 2012

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“…De acordo com Sainz et al (2006), 80% do gado nacional é composto de raças zebuínas. Contudo, o cruzamento industrial surgiu há algum tempo como forma de otimizar o desempenho e melhorar os índices de desfrute nas propriedades.…”

Section: Introductionunclassified

Exigências de energia de animais Nelore puros e mestiços com as raças Angus e Simental

Marcondes¹,

Filho

Oliveira³

et al. 2011

R. Bras. Zootec.

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RESUMO -Objetivou-se com este trabalho estimar as exigências nutricionais de energia líquida e metabolizável de animais Nelore, Nelore-Angus e Nelore-Simental, as eficiências de uso da energia metabolizável para ganho e mantença e a eficiência de deposição de energia na forma de proteína e gordura. Foram utilizados 69 animais (23 Nelore, 23 Nelore-Angus e 23 NeloreSimental): quatro animais de cada grupo genético (12 no total) foram abatidos antes do início do experimento como gruporeferência e nove foram separados para um ensaio de digestibilidade. Os animais restantes foram divididos em três dietas (ofertas de concentrado na proporção de 1 ou 2% do peso corporal obtido com consumo à vontade ou correspondente a 1% da exigência de mantença). Ao final todos animais foram abatidos e a composição corporal e o peso de corpo vazio (PCVZ) determinados.As exigências líquidas de energia foram estimadas pela equação da energia retida em função do PCVZ 0,75 e ganho de peso de corpo vazio (GPCVZ). Foram estimadas as exigências de energia líquida e metabolizável para mantença pela equação da produção de calor em função do consumo de energia metabolizável. Houve efeito do teor de concentrado da dieta sobre a relação peso corporal:PCVZ, assim como para a relação ganho de peso corporal:GPCVZ. A exigência diária de energia líquida para mantença de animais Nelore, Nelore-Angus ou Nelore-Simental é de 75,8 kcal/PCVZ 0,75 e a de energia metabolizável, de 112,82 kcal/PCVZ 0,75 .As eficiências de uso da energia metabolizável para ganho e mantença são de 41,22 e 67,19%, respectivamente, e as eficiências de deposição da energia na forma de proteína e gordura, 26,71 e 75,43%, respectivamente.Palavras-chave: eficiência de uso da energia, energia líquida, energia metabolizável, exigências, terminação Energy requirements of Nellore purebred and crossbreed with Angus and SimmentalABSTRACT -The objective of this work was to estimate the nutritional requirements of net and metabolizable energy of Nellore, Nellore-Angus and Nellore Simmental cattle, as well as the efficiency of utilization of metabolizable energy for gain and maintenance and efficiency of energy deposition in the form of protein and fat. It was used 69 animals (23 Nellore, 23 Nellore-Angus and 23 Nellore-Simmental): four animals from each genetic group (12 in total) were slaughtered before the beginning of the experiment as the baseline group, and nine were used in a digestibility trial. The remaining animals were grouped in three dietary treatments (concentrate fed at 1 or 2% of body weight obtained with ad libitum intake or corresponding to 1% of the maintenance requirement). At the end of the experiment, all animals were slaughtered and body composition and empty body weight (EBW) were determined. The net energy requirements were estimated by using the equation of retained energt as a function of EBW 0.75 and empty body weight gain (EBG). It was estimated the requirements of net and metabolizable energy for maintenance by using heat production equation in function of metabo...

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“…In the study conducted by Oltjen et al (1986), k 1 had a minimum increase of 156 % and the maximum of 389 % compared to the original values (k 1 = 0.00429, Table 6), while a had a minimum increase of 126 % and the maximum of 160 % compared to the original values (a = 0.086, Table 6). Previous study involving reparameter- Sainz et al (2006), k 1 had a minimum increase of 220 % and the maximum of 549 %; a had a minimum increase of 141 % and the maximum of 178 % (Table 7). Breeds and genetic improvement are the possible causes of parameter changes.…”

Section: Resultsmentioning

confidence: 99%

“…However, k 2 and k 3 , are highly correlated, thus, it is not feasible to adjust the two parameters simultaneously. An alternative mentioned in the literature (Oltjen et al, 1986;Sainz et al, 2006) was to keep the value of k 2 at 0.0461.…”

Section: Modelmentioning

confidence: 99%

“…Although there are several studies on nutritional requirements of cattle in Brazil (Marcondes et al, 2010a, b;Paulino et al, 2010;Sainz et al, 2006;Valente et al, 2013), the DGM parameterization for Zebu genetics explored under Brazilian conditions has never included the estimation of parameter distribution by nonparametric bootstrap and statistical inferences.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Parametrization of the Davis Growth Model using data of crossbred Zebu cattle

Biase

Dias

Barioni

et al. 2017

Sci. agric. (Piracicaba, Braz.)

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The system of differential equations proposed by Oltjen et al. [1986, named Davis Growth Model (DGM)] to represent cattle growth has been parameterized with data from Bos taurus (British) and Bos indicus (Nellore) breeds. The DGM has been successfully used for simulation and decision support in the United States. However, the effect of about 30 years of genetic improvement and the use of different breeds may affect the model parameter values, which also may need to be re-estimated for crossbred animals. The aim of this study was to estimate parameter values and confidence intervals for the DGM with growth and body composition data from Zebu crossbred animals. Confidence intervals and asymptotic distribution were generated through nonparametric bootstrap with data from a field experiment conducted in Brazil. The parameters showed normal probability distribution for most scenarios. The rate constant for deoxyribonucleic acid (DNA) synthesis had a minimum increase of 156 % and the maximum of 389 %, compared to the original values and the maintenance requirement had a minimum increase of 126 % and maximum of 160 % compared to the original values. Lower limits of 95 % confidence intervals for the parameters related to maintenance and protein accretion rates were higher than the original estimates of the DGM, evidencing genetic differences of the Zebu crossbred animals in relation to the original DGM parameters.

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Growth patterns of Nellore vs British beef cattle breeds assessed using a dynamic, mechanistic model of cattle growth and composition.

Cited by 16 publications

References 0 publications

Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture

Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore × Holstein bulls on pasture

Exigências de energia de animais Nelore puros e mestiços com as raças Angus e Simental

Parametrization of the Davis Growth Model using data of crossbred Zebu cattle

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