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Nutritive value of Tanzania grass for dairy cows under rotational grazing R. Bras. Zootec.
Fernandes,Alberto Magno; Deresz,Fermino; Henrique,Douglas Sampaio; Lopes,Fernando César Ferraz; Glória,Leonardo Siqueira.
A nutritional analysis of Tanzania grass (Megathyrsus maximusJacquin cv. Tanzânia was conducted. Pasture was managed in a rotational grazing system with a 30-day resting period, three days of paddock occupation and two grazing cycles. Ten Holstein × Zebu crossbred cows were kept within a 2-ha area divided into 11 paddocks ha-1. Cows were fed 2 kg of corn meal daily and performance was evaluated by weighing the animals every 14 days and by recording milk production twice a day. Nutritional composition of the Tanzania grass was determined from forage (extrusa) samples collected by esophageal fistulae from two animals. The nutritive value of Tanzania grass was estimated according to a modification of the CNCPS evaluation model. Tanzania grass supplemented...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal performance; Dairy cows; Tropical pastures.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000800410
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Performance and digestibility of steers fed by-product of fresh passion fruit or sorghum silage, with and without concentrate supplementation R. Bras. Zootec.
Alves,Guilherme Ribeiro; Fontes,Carlos Augusto de Alencar; Processi,Elizabeth Fonsêca; Fernandes,Alberto Magno; Oliveira,Tadeu Silva de; Glória,Leonardo Siqueira.
ABSTRACTThe objective of this study was to evaluate the nutritive value of passion fruit by-product for cattle, contrasting the results with those found with sorghum silage. Four treatments were then constituted, comprising the combinations of the two roughages and the two levels of supplementation (with or without), in a completely randomized design with four animals per treatment. The considered variables included: feed intake, digestibility coefficients of the diets, and live weight gain of the animals. The experimental period lasted 70 days, preceded by a standardization period of 30 days. Chromium oxide was utilized to estimate the fecal output, in the digestibility trial. Treatments were compared by means of three orthogonal contrasts: between the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Byproduct; Positive associative effect; Reduction of digestibility; Weight gain.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000900314
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Simulation of diets for dairy goats and growing doelings using nonlinear optimization procedures R. Bras. Zootec.
Glória,Leonardo Siqueira; Abreu,Matheus Lima Corrêa; Rocha,Norberto Silva; Oliveira,Tadeu Silva de; Gomes,Raphael dos Santos; Rohem Júnior,Nardele Moreno; Bendia,Laila Cecília Ramos; Fernandes,Alberto Magno.
ABSTRACT The objective of this study was to simulate total dry matter intake and cost of diets optimized by nonlinear programming to meet the nutritional requirements of dairy does and growing doelings. The mathematical model was programmed in a Microsoft Excel(r) spreadsheet. Increasing values of body mass and average daily weight gain for growing doelings and increasing body mass values and milk yield for dairy does were used as inputs for optimizations. Three objective functions were considered: minimization of the dietary cost, dry matter intake maximization, and maximization of the efficiency of use of the ingested crude protein. To solve the proposed problems we used the Excel(r) Solver(r) algorithm. The Excel(r) Solver(r) was able to balance diets...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Decision support system; Diet formulation; Diet optimization; Goat nutrition.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000200071
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Intake and digestibility of silages containing pineapple pulp and coast-cross hay with or without urea and markers recovery in sheep R. Bras. Zootec.
Alves,Guilherme Ribeiro; Fontes,Carlos Augusto de Alencar; Fernandes,Alberto Magno; Processi,Elizabeth Fonsêca; Oliveira,Tadeu Silva de; Glória,Leonardo Siqueira; Gomes,Raphael dos Santos.
ABSTRACT The objective of this study was to evaluate the intake and digestibility of silages containing pineapple pulp and coast-cross hay, with or without addition of urea, and the recovery of the markers chromium oxide (Cr2O3), indigestible neutral detergent fiber (iNDF), indigestible acid detergent fiber (iADF), and indigestible dry matter (iDM), in a digestibility assay, in sheep. Treatments were as follows: two levels of pineapple pulp (818 and 758 g kg−1) and two levels of urea (with and without urea), in a completely randomized design. Twelve sheep (three per treatment) were used, kept in metabolic cages. Fecal excreta were determined by total collection or estimated by using the markers. Marker samples were obtained in morning and afternoon...
Tipo: Info:eu-repo/semantics/article Palavras-chave: By-products; Fecal collection; Nitrogen compounds.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000400151
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Genome association study through nonlinear mixed models revealed new candidate genes for pig growth curves Scientia Agricola
Silva,Fabyano Fonseca e; Zambrano,Maria Fernanda Betancur; Varona,Luis; Glória,Leonardo Siqueira; Lopes,Paulo Sávio; Silva,Marcos Vinícius Gualberto Barbosa; Arbex,Wagner; Lázaro,Sirlene Fernandes; Resende,Marcos Deon Vilela de; Guimarães,Simone Eliza Facioni.
ABSTRACT: Genome association analyses have been successful in identifying quantitative trait loci (QTLs) for pig body weights measured at a single age. However, when considering the whole weight trajectories over time in the context of genome association analyses, it is important to look at the markers that affect growth curve parameters. The easiest way to consider them is via the two-step method, in which the growth curve parameters and marker effects are estimated separately, thereby resulting in a reduction of the statistical power and the precision of estimates. One efficient solution is to adopt nonlinear mixed models (NMM), which enables a joint modeling of the individual growth curves and marker effects. Our aim was to propose a genome association...
Tipo: Info:eu-repo/semantics/article Palavras-chave: SNP markers; Body weight; Longitudinal data.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100001
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