Eficiência de utilização da energia metabolizável em bovinos Nelore puros e cruzados submetidos a quatro níveis de concentrado na ração

Freitas, José Antônio de; Queiróz, Augusto César de; Dutra, Alecssandro Regal; Vieira, Ricardo Augusto Mendonça; Lana, Rogério de Paula; Leonel, Fernando de Paula; Henrique, Douglas Sampaio; Lima, Adhemar Ventura de; Souza, Júlio César de

doi:10.1590/s1516-35982006000300036

Cited by 8 publications

(5 citation statements)

References 12 publications

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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: 90%

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: 90%

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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“…According to Freitas et al . () older animals (with a greater degree of physiological maturity) have a greater efficiency gain for the synthesis of fat than younger animals, which have higher efficiency of protein gain and protein synthesis, so the feed conversion estimates become different depending on the age at which these animals are tested.…”

Section: Discussionmentioning

confidence: 99%

Cluster and meta‐analyses of genetic parameters for feed intake traits in growing beef cattle

Diaz

Crews

Enns

2013

J Animal Breeding Genetics

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A data set based on 50 studies including feed intake and utilization traits was used to perform a meta-analysis to obtain pooled estimates using the variance between studies of genetic parameters for average daily gain (ADG); residual feed intake (RFI); metabolic body weight (MBW); feed conversion ratio (FCR); and daily dry matter intake (DMI) in beef cattle. The total data set included 128 heritability and 122 genetic correlation estimates published in the literature from 1961 to 2012. The meta-analysis was performed using a random effects model where the restricted maximum likelihood estimator was used to evaluate variances among clusters. Also, a meta-analysis using the method of cluster analysis was used to group the heritability estimates. Two clusters were obtained for each trait by different variables. It was observed, for all traits, that the heterogeneity of variance was significant between clusters and studies for genetic correlation estimates. The pooled estimates, adding the variance between clusters, for direct heritability estimates for ADG, DMI, RFI, MBW and FCR were 0.32 ± 0.04, 0.39 ± 0.03, 0.31 ± 0.02, 0.31 ± 0.03 and 0.26 ± 0.03, respectively. Pooled genetic correlation estimates ranged from -0.15 to 0.67 among ADG, DMI, RFI, MBW and FCR. These pooled estimates of genetic parameters could be used to solve genetic prediction equations in populations where data is insufficient for variance component estimation. Cluster analysis is recommended as a statistical procedure to combine results from different studies to account for heterogeneity.

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“…Energy is essential to support all vital body processes, including respiration, circulation, muscle activity, maintenance of body temperature, metabolic processes, among other functions (FREITAS et al, 2006). However, when the use of concentrates in an animal feeding program is elevated, if the energy level is increased, the production cost rises; hence why the analysis of economic viability is important for describing all details of the production chain and seeking the necessary alterations for greater production efficiency.…”

Section: Introductionmentioning

confidence: 99%

Performance and economic viability of feedlot sheep fed different levels of roughage, concentrate, and water

Silva

Araújo

Oliveira

et al. 2016

SCA

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The aim of this study was to evaluate performance and economic viability of producing sheep fed different levels of roughage, concentrate, and water. Forty Santa Inês crossbred sheep with an average initial weight of 18.85 ± 2.80 kg and an average age of 5.0 ± 2.0 months were distributed in a completely randomized design with a 2 × 2 factorial arrangement composed of two proportions of roughage and concentrate (30:70 and 70:30) and two levels of water supply (ad libitum, and 50% restriction), with 10 replicates. Water restriction had a negative effect (P<0.05) on the intakes of dry matter and nutrients and total and daily weight gains, regardless of the proportions of roughage and concentrate. Water restriction did not affect (P>0.05) feed conversion or feed conversion. Total weight gain, average daily gain, feed conversion, and feed efficiency were influenced by the proportions of roughage and concentrate. In conclusion, the diet with 70% roughage, associated with a water restriction of 50%, reduced the uptake of energy and protein, compromising the animal performance. The combination of the diet plus concentrate and water restricted to 50% of the free consumption provides a better cost-benefit ratio. Key words: Water intake. Feed intake. Weight gain. Water restriction. ResumoObjetivou-se avaliar o desempenho e a viabilidade econômica da produção de ovinos recebendo diferentes ofertas de volumoso, concentrado e água. Utilizaram-se 40 ovinos mestiços de Santa Inês, não castrados, com peso inicial de 18,85 ± 2,80 kg e idade média de 5,0 ± 2,0 meses, distribuídos em um delineamento inteiramente casualizado, em um esquema fatorial 2 x 2, composto por duas proporções volumoso e concentrado: 30:70 e 70:30 e duas ofertas de água (água à vontade e restrito em 50%) com 10 repetições. A restrição de água causou efeito negativo (P<0,05) no consumo de matéria seca e nutrientes, ganho de peso total e diário, independentemente das proporções de volumoso e concentrado. Não houve efeito (P>0,05) da restrição de água na conversão e eficiência alimentar. O ganho de peso total, ganho médio diário, conversão e eficiência alimentar foram influenciados pelas proporções de volumoso e concentrado. Concluiu-se que a dieta com 70% de volumoso e associada a uma restrição hídrica de 50%, reduz o aporte de energia e proteína, desfavorecendo o desempenho animal. A combinação da dieta com mais concentrado e restrição hídrica de 50% do consumo permite melhor relação custo benefício. Palavras-chave: Consumo de água. Consumo de alimento. Ganho de peso. Restrição de água.

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Eficiência de utilização da energia metabolizável em bovinos Nelore puros e cruzados submetidos a quatro níveis de concentrado na ração

Cited by 8 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

Cluster and meta‐analyses of genetic parameters for feed intake traits in growing beef cattle

Performance and economic viability of feedlot sheep fed different levels of roughage, concentrate, and water

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