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

Marcondes, Marcos Inácio; Filho, Sebastião de Campos Valadares; Oliveira, Ivanna Moraes de; Paulino, Mário Fonseca; Paulino, Pedro Veiga Rodrigues; Detmann, Edênio; Silva, L.F.C.

doi:10.1590/s1516-35982011000400023

Cited by 9 publications

(4 citation statements)

References 12 publications

(6 reference statements)

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“…This value is close to the 98.97 and 97.71 kcal/kgEBW 0.75 /day found by Marcondes et al (2011) andFreitas et al (2006) respectively, working on males of the same genetic groups used in this study. Using the slope of the generated model (Figure 3), there is an efficient use of metabolizable energy for weight gain (kg) of 36.41%.…”

Section: Resultssupporting

confidence: 89%

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: Resultssupporting

confidence: 89%

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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“…Dry matter (DM) digestibility and fecal N were derived from several local grazing experiments on Bh grass pasture [Glover et al, 1957;CIAT Tropical Pasture Program (TPP), 1987-91], and were compared with Whitehead (1995), Dong et al (2014), andZhu et al (2018) findings. Urinary N excretion was computed as in Marcondes et al (2011) and Waldrip et al (2013). Fecal N2O and CH4 emissions factors, and urinary N2O emissions factors were derived from Lessa et al (2014) and were compared for consistency with those of Braz et al (2013), Pelster et al (2016), andZhu et al (2018), plus locally derived emissions from Chirinda et al (2019).…”

Section: Carbon Footprintsmentioning

confidence: 99%

“…Fecal N2O and CH4 emissions factors, and urinary N2O emissions factors were derived from Lessa et al (2014) and were compared for consistency with those of Braz et al (2013), Pelster et al (2016), andZhu et al (2018), plus locally derived emissions from Chirinda et al (2019). In several randomly selected cases, the calculated N balances were compared with data from Marcondes et al (2011) We used values for GHG emissions from Serr and Plains savanna (PlSav) controls from the review article on soils by Castaldi et al (2006). The values assumed for the rate of SOC accumulation in SerrSav and PlSav are the same in the absence of published information on SerrSav.…”

Section: Carbon Footprintsmentioning

confidence: 99%

A dynamic simulation model to assess farm-level effects of pasture intensification strategies on beef herd outputs and carbon footprints in acid soil savannas of Eastern Colombia

Vera-Infanzón

Rao²,

Ramírez-Restrepo³

2023

ALPA

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The neotropical savannas of Eastern Colombia (Llanos) are subjected to changes in land use associated with intensification of beef production and there is limited knowledge on the long-term impacts of these change processes. Furthermore, the effects of spatial and temporal intensification at farm level via the introduction of sown pastures on beef herd outputs, their greenhouse gas (GHG) emissions and the resulting carbon (C) footprints in contrasting savanna landscapes of of the Llanos are unknown. This study was aimed to assess the consequences of gradual system intensification via introduction of sown tropical pastures in two contrasting landscapes, the tillable, flat savannas and the highly dissected rangelands, of the well-drained Eastern savannas of Colombia, in terms of cow-calf production and GHG emissions and the resulting C footprints. A dynamic model was developed to simulate the gradual introduction of two types of tropical pastures in a region with dissected and steep slopes and limited tillable areas where cattle would also have access to Serrania savanna and sown pastures, versus one located in the Plains that are fully transformed over time with the exclusion of native rangelands. Marked changes in herd demography, animal outputs, and emissions were found over time. The C footprint of all systems varied over time depending upon the length of time that pastures contributed to soil organic carbon accumulation and the balance between savanna and sown pasture areas at a whole farm level. In conclusion, the dynamics of the systems subject to intensification were marked and were dependent on the temporal and spatial deployment of sown forage resources. Therefore, generalizing the trends for the region as a whole result in uncertainty. Nevertheless, examination of simulated prototypes may shed light on the expected trends and provides guidance for decision-making

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“…These steers were utilized as the baseline group in order to estimate the initial EBW of the other animals. The steers from the maintenance group were fed 11 g DM/kg BW, as described in literature (COSTA E SILVA et al, 2012;MARCONDES et al, 2011). The performance animals were fed ad libitum.…”

Section: Treatments and Experimental Designmentioning

confidence: 99%

Energy and protein requirements of crossbred Holstein x Zebu steers fed different levels of calcium and phosphorus in the diet

Zanetti

Filho

Detmann

et al. 2016

SCA

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The aim of this study was to determine the energy and protein requirements of crossbred Holstein x Zebu steers fed with or without the supplementation of dicalcium phosphate in the diet. Thirty-two steers with an average initial body weight of 377.5 ± 49.4 kg were used, of which four were initially slaughtered to estimate the empty body weight (EBW) of the animals. Twenty-four steers were fed ad libitum and were distributed in a completely randomized design with two levels of concentrate (30 and 60 %), and diets with or without dicalcium phosphate and four steers were fed at maintenance level, so that the body weight gain was equal to zero. After 84 days the animals were slaughtered. The animal tissues were sampled, and composted by two samples, denominated by "carcass" (bone, muscle and fat) and "non-carcass" (head, limbs, blood, hide, organs and viscera) for determination of the body composition. The net energy requirements (NEm) and metabolizable energy for maintenance (MEm) were obtained while relating heat production (HP) and metabolizable energy intake (MEI); meanwhile, the net energy requirements for gain (NEg) and the net protein requirements for gain (NPg) were obtained as a function of empty body weight (EBW), empty body gain (EBG) and retained energy (RE) ResumoObjetivou-se determinar as exigências nutricionais de energia e proteína para bovinos castrados mestiços Holandês x Zebu alimentados com ou sem suplementação inorgânica de cálcio e fósforo na dieta. Foram utilizados 32 animais mestiços Holandês × Zebu, machos, castrados, com peso corporal (BW) médio inicial de 377,5 ± 49,4 kg, dos quais quatro foram abatidos inicialmente para estimar o peso de corpo vazio (EBW) dos demais, 24 alimentados ad libitum distribuídos em delineamento inteiramente casualizado com dois níveis de concentrado (30 e 60%) e dietas contendo ou não fosfato bicálcico; e quatro alimentados ao nível de mantença, isto é, para que o ganho de peso corporal fosse igual a zero. Após 84 dias os animais foram abatidos. Para determinação da composição corporal dos animais, foram constituídas duas amostras por animal, denominadas "carcaça" (óssos, musculo e gordura) e "não carcaça" (cabeça, membros, sangue, couro, orgãos e visceras). As exigências de energia líquida (NEm) e metabolizável para mantença (MEm) foram obtidas relacionando a produção de calor (HP) e o consumo de energia metabolizável (MEI), enquanto as exigências de energia líquidas para ganho de peso (NEg) e as exigências líquidas de proteína para ganho (NPg) foram obtidas em função do EBW, do ganho de peso de corpo vazio (EBG), e da energia retida (RE) no EBW. As exigências diárias de energia líquida e metabolizável para mantença de bovinos mestiços Holandês × Zebu castrados foram de 76,90 e 119,36 kcal/EBW 0,75 , respectivamente. As exigências de energia líquida para ganho podem ser obtidas pela equação: NEg = 0,0568 ±0,0025 × EBW 0,75 × EBG 1,095 . As eficiências de uso da energia metabolizável para mantença e para ganho foram de 64,4 e 29,68%, respectivament...

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

Cited by 9 publications

References 12 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

A dynamic simulation model to assess farm-level effects of pasture intensification strategies on beef herd outputs and carbon footprints in acid soil savannas of Eastern Colombia

Energy and protein requirements of crossbred Holstein x Zebu steers fed different levels of calcium and phosphorus in the diet

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