A meta-analysis of dry matter intake in Nellore and Zebu-crosses cattle

Azevêdo, José Augusto Gomes; Filho, Sebastião de Campos Valadares; Pina, Douglas dos Santos; Chizzotti, Antônio; Valadares, Rilene Ferreira Diniz

doi:10.1590/s1516-35982010000800024

Cited by 14 publications

(9 citation statements)

References 38 publications

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“…The intake of DM and NDF (% BW) were higher in the treatment containing soybean silage with inoculant and molasses compared to control diet. Values ranging from 1.83 to 2.16 kg are close to that observed for by Azevêdo et al (2010) in a meta-analysis to determine the equation to estimate dry matter intake in feedlot animals. These authors observed mean intake (% BW) of 2.16 kg for daily weight gain of 1.20 kg.…”

Section: Resultssupporting

confidence: 71%

<b>Soybean silage in the diet for beef cattle

Rigueira

Pereira

Filho

et al. 2015

Acta Sci. Anim. Sci.

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ABSTRACT. This experiment evaluated the effect of molasses with or without microbial additive on soybean silage regarding the intake, digestibility and growth performance of beef cattle. The experimental design used was randomized blocks with four treatments (diets with soybean silage (SS), SS with microbial inoculant, SS with molasses and SS with microbial inoculant and molasses) and seven replications. Animal were feedlot fed for 99 days. Diets contained forage: concentrate ratio of 70:30, the forage consisted of 40% soybean silage and 30% corn silage. There was lower intake of nutrients in the diet containing SS in relation to the SS diet added with inoculant and molasses. The diet containing SS with inoculant and molasses presented higher apparent digestibility for DM, CP, NDF, ADF, and NFC. Feed conversion, average daily gain and carcass gain were not influenced by the diets, with mean values of 5.90; 1.49 and 0,91 kg dayrespectively. The addition of molasses combined or not with bacterial inoculant to soybean at the time of ensiling has no effect on the performance of beef cattle, although favoring the intake and digestibility of nutrients.Keywords: digestibility, feedlot, intake, microbial inoculant, molasses.Silagem de soja na dieta de bovino de corte RESUMO. Objetivou-se avaliar o efeito de melaço e ou aditivo microbiano na ensilagem de soja sobre o consumo, digestibilidade dos nutrientes e desempenho produtivo de bovinos de corte. O delineamento experimental utilizado foi o em blocos casualizados com quatro tratamentos (dietas com silagem de soja (SS), SS com inoculante microbiano, SS com melaço e SS com inoculante microbiano e melaço) e sete repetições. Os animais foram confinados por um período de 99 dias. As dietas continham relação volumoso:concentrado de 70:30, sendo o volumoso 40% de silagem de soja e 30% de silagem de milho. Observou-se menor consumo de nutrientes na dieta contendo SS em relação à dieta SS com inoculante e melaço. Na dieta contendo SS com inoculante e melaço, foram observadas maiores digestibilidades aparentes para MS, PB, FDN, FDA e CNF. A conversão alimentar, o ganho médio diário e o ganho de carcaça não foram influenciados pelas dietas, registrando-se valores médios de 5,90; 1,49 e 0,91 kg dia -1 , respectivamente. Conclui-se, que a adição de melaço na presença ou não de inoculante bacteriano à soja por ocasião da ensilagem, não afeta o desempenho de bovinos de corte, embora favoreça o consumo e a digestibilidade de nutrientes.Palavras-chave: digestibilidade, consumo, confinamento, aditivo microbiano, melaço.

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Section: Resultssupporting

confidence: 71%

<b>Soybean silage in the diet for beef cattle

Rigueira

Pereira

Filho

et al. 2015

Acta Sci. Anim. Sci.

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“…II, the mean intakes of DM, OM, CP, EE, NDF ap , NFC, and TDN were constant (P > 0.05) at the 4 infusion levels of RNA into the abomasum, with means of 4.07, 3.88, 0.47, 0.11, 1.61, 1.68, and 3.13 kg/d, respectively (Table 5). The observed DMI level (1.37% BW) was 16.8% greater than the maintenance level of approximately 1.14% BW, as estimated using the equation (DMI = −1.36 + 0.016BW + 5.64ADG -1.85ADG 2 ) proposed by Azevêdo et al (2010) to predict DMI of Nellore cattle under tropical conditions. This was in accordance with the experimental design, intended to enable estimates of the endogenous fraction of PD in urine under conditions as close as possible to DMI maintenance level.…”

Section: Exp IImentioning

confidence: 96%

Endogenous fraction and urinary recovery of purine derivatives obtained by different methods in Nellore cattle1

Barbosa

Valadares

Filho

et al. 2011

Journal of Animal Science

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Two experiments were conducted to assess the endogenous fraction of purine derivative (PD) excretion, urinary recovery, and intestinal digestibility of purines in Nellore heifers. For both experiments, 8 Nellore heifers fitted with ruminal and abomasal cannulas were allocated to two 4 × 4 Latin squares. The diets were based on corn silage and concentrate (60 and 40% DM basis, respectively); feces and urine samples were obtained by total collection, and abomasal DM flow was estimated using indigestible NDF as an internal marker. In Exp. I, 4 of the 8 heifers (BW 258 ± 20 kg) were also fitted with ileal cannula. The planned treatments were 4 different DMI: 1.2, 1.6, 2.0, and 2.4% of BW (DM basis). The endogenous losses and purine recovery as urinary PD were estimated using linear regression between daily urinary PD excretion (Y) and daily abomasal flow of purine bases (X), expressed in millimoles per kilogram of BW(0.75). In Exp. II, the same 8 Nellore heifers (BW of 296 ± 15 kg) were fed at 1.37% BW (DM basis). The treatments were the infusion of purines (RNA from torula yeast, type VI, Sigma) into the abomasum in increasing amounts (0, 33, 66, and 100 mmol/d). All statistical analyses were performed using the PROC MIXED procedure in SAS. In Exp. I, the DMI range was 1.16 to 1.84% of BW and did not affect (P > 0.05) the apparent RNA digestibility in the small intestine, which had a mean of 75.6%, and a true digestibility of 93.0%. The mean ratio of the N-RNA to the total-N in the ruminal bacteria was 0.137. The daily urinary PD excretion (Y, mmol/kg of BW(0.75)) was a function of RNA flow in the abomasum (X, mmol/kg of BW(0.75)): Y = 0.860X + 0.460, where 0.860 and 0.460 were the PD recovery of purines and the endogenous fraction (in mmol/kg of BW(0.75)), respectively. In Exp. II, the daily urinary PD excretion was a function of RNA flow in the abomasum: Y = 0.741X + 0.301, where 0.741 and 0.301 were the recovery of PD in urine of infused purines and the endogenous losses (in mmol/kg of BW(0.75)), respectively. In conclusion, our data suggest that in Nellore heifers the respective values of endogenous PD excretion (mmol/kg of BW(0.75)), urinary recovery of the purines absorbed in the abomasum, and true digestibility of RNA in the small intestine were 0.30, 0.80, and 0.93.

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“…Independent studies of nutrient requirements of hair sheep have primarily been performed in tropical regions. However, there are, in general, significant differences among studies (Azevêdo, Valadares Filho, Pina, Chizzotti, & Valadares, ), resulting in inconclusive results. Thus, only through meta‐analysis, it is possible to control the various effects observed across studies and to develop equations for prediction of general requirements of these animals.…”

Section: Introductionmentioning

confidence: 99%

Meta‐analysis of the energy and protein requirements of hair sheep raised in the tropical region of Brazil

Oliveira

Pereira

Biffani

et al. 2017

Animal Physiology Nutrition

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SummaryThe objective of this study was to estimate, through mathematical models, energy and protein requirements for maintenance and gain of hair sheep raised in the tropical region of Brazil. To determine the equation parameters, a meta-analysis of seven independent experiments of nutrient requirements was performed, comprising a total of 243 experimental units (animals), which were conducted under tropical conditions, using hair sheep in growing and finishing phases and endowed of the following quantitative data for each animal: body weight (BW), empty body weight (EBW), average daily gain (ADG), empty body gain (EBG), heat production (HP), metabolizable energy intake (MEI), retained energy (RE), metabolizable protein intake (MPI) and body protein content. The regression equations generated were as follows: for Net Energy for main tenance, . Considering an ADG of 100 g, the NP g requirement ranged from 12.4 to 10.5 g/day for animals with BW ranging from 10 to 40 kg respectively. The total metabolizable energy and protein requirements were lower than those reported by the NRC and AFRC systems. Thus, our results support the hypothesis that nutrient requirements of hair sheep raised in tropical regions differ from wool sheep raised in temperate regions. Therefore, the use of the equations designed in this study is recommended. K E Y W O R D Smeat sheep, nutrient requirements, prediction equations

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A meta-analysis of dry matter intake in Nellore and Zebu-crosses cattle

Cited by 14 publications

References 38 publications

<b>Soybean silage in the diet for beef cattle

<b>Soybean silage in the diet for beef cattle

Endogenous fraction and urinary recovery of purine derivatives obtained by different methods in Nellore cattle1

Meta‐analysis of the energy and protein requirements of hair sheep raised in the tropical region of Brazil

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