Feedlot consulting nutritionists were invited to participate in a survey of feedlot nutritional and management practices Brazil. Thirty-one completed the on Web site that was designed for collection data. The consisted 94 questions included general information (n = 10); commodity 12); about use coproducts 5), roughage source levels finishing diet adaptation methods 7), supplements micronutrients 8), feed mixers 6), feeding 3), cattle type fed 16), formulation 17), resources used...

Brazil is the world's largest beef exporter with commercial cattle herd; however, production cycle needs to be more efficient supply internal and external demands in future. Feedlot operations are currently a reality for Brazilian industry; nonetheless industry still based on grass-fed animals which Nellore breed predominates. At some point this constitutes an important advantage exportations because countries look "natural beef." packing plants regulate use of antibiotics, especially...

The objectives of this work were to study the segregation single nucleotide polymorphisms calpain 1, large subunit (CAPN1) and calpastatin (CAST) genes in Nellore (Bos indicus) xBos taurus beef cattle, as well evaluate their effects on meat traits. For this, 300 animals, including 114 Nellore, 67 Angus x 44 Rubia Gallega 41 Canchim, 19 Brangus three-way crosses 15 Braunvieh crosses, genotyped for CAPN4751 [AF_248054.2:g.6545C>T (GenBank accession AF248054.2)] CAST/DdeI [AF_159246.1:g.2959A>G...

The objective of this experiment was to evaluate the effects 25-hydroxyvitamin D3 (25(OH)D3) supplementation on growth performance, carcass characteristics, meat quality, and expression genes related anabolism skeletal muscle in finishing beef cattle. One hundred twenty Nellore bulls (initial body weight (BW) = 376 ± 20 kg) were blocked by initial BW, allocated 24 pens (5 bulls/pen) assigned one three treatments during a 96 days feeding experiment: control: high concentrate basal diet (11%...

Oitenta e seis machos jovens, não-castrados, divididos em quatro grupos raciais - Nelore (n=20), Canchim (n=17), ½ ×Nelore (CN) (n=25) ¾ (TQ) (n=24) foram pesados a cada 28 dias para avaliação de ganho peso (kg/dia), ingestão matéria seca (kg/dia) conversão alimentar. Ao atingirem abate médio 450 kg espessura gordura subcutânea superior 4 mm, os animais abatidos do rendimento carcaça cortes comerciais traseiro, área olho-de-lombo, (mm), marmorização, força cisalhamento, extrato etéreo (%)...

Objetivou-se estudar o efeito das diferentes proporções de sangue Simental e Nelore sobre as características da carcaça carne bovinos superprecoces. Foram utilizados 72 jovens inteiros (18 Nelore; 18 ½ × Simbrasil Simental), com 8 meses idade 250 kg PV médio inicial. Os animais foram desmamados aos em sistema creep-feeding posteriormente confinados durante 150 dias até atingirem peso abate, acima 465 kg, abatidos frigorífico comercial. valores pH temperatura resfriamento carcaças foi...

This study was performed to compare CAPN1, CAPN2, CAST, TG, DGAT1 and LEP gene expressions correlate them with meat quality traits in two genetic groups (Nellore Canchim) order assess their expression profile use as markers. We analyzed 30 young bulls (1 year old), 15 of each group. Samples the Longissimus dorsi muscle were collected for analysis of: total lipids (TL) tenderness measured Warner-Bratzler shear force (SF) myofibrillar fragmentation (MFI) at day slaughter 7 days aging. Gene...

The objective of this study was to evaluate effects feeding monensin (MON) or a multivalent polyclonal antibody preparation (PAP) against several rumen microorganisms on feedlot performance, carcass characteristics, blood gas profile, and rumenitis Bos indicus biotype (BT) yearling bulls. designed as completely randomized design with 3 × 2 factorial arrangement, replicated 4 times, in which 32 bulls each BT evaluated (3-way-cross, TC; Canchim, CC; Nellore, NE) were fed diets containing...

Nine ruminally cannulated cows fed different energy sources were used to evaluate an avian-derived polyclonal antibody preparation (PAP-MV) against the specific ruminal bacteria Streptococcus bovis, Fusobacterium necrophorum, Clostridium aminophilum, Peptostreptococcus anaerobius, and sticklandii monensin (MON) on fermentation patterns in vivo digestibility. The experimental design was three 3 × Latin squares distinguished by main source diet [dry-ground corn grain (CG), high-moisture silage...

Avaliaram-se 20 cordeiros machos ¾ mestiços Suffolk submetidos a dietas isoprotéicas (21% proteína bruta) e isoenergéticas (2,9 Mcal EM/kg MS), nas formas farelada peletizada, abatidos com 26 28 kg de peso vivo. Os tiveram acesso ao creep feeding, permanecendo as ovelhas até atingirem o abate. A ração peletizada promoveu maior rendimento carcaça quente (54,18% para 52,04% farelada) verdadeiro (58,37% 56,66% farelada). O vivo final não interferiu nos pesos das carcaças fria (12,79 13,05...

The aim of this study was to estimate the segregation leptin (LEP), diacylglycerol O-acyltransferase (DGAT1) and fatty acid-binding protein 4 (FABP4) gene polymorphisms in Nelore (Bos indicus) × Bos taurus beef cattle, evaluate their effects on carcass meat traits. A total 300 animals were genotyped for LEP/BsaAI (Y_11369.1:g.1620G > A), DGAT1-VNTR (18-bp repeat element promoter region) FABP4/MspA1I (AAFC_01136716.1:g.7516G C) phenotyped rib eye area, backfat thickness (BT), intramuscular...

In the present study, effects of restricted intake final finishing diet as a means dietary adaptation compared with diets increasing in concentrate content (step-up) over periods 14 and 21 days on growth performance, carcass characteristics, feeding behaviour rumen morphometrics Nellore cattle were evaluated. One hundred twenty 20 months old bulls (initial BW = 372.2 kg, s.d. 21.5 kg) randomly allocated 24 pens (n 5 per pen) fed for 84 days. The study had completely randomised design 2 ×...

Context The use of two feed additives, to maximise rumen fermentation, in finishing diets offered feedlot cattle may positively impact performance. Aims This study, conducted at the São Paulo State University feedlot, Botucatu campus, Brazil, was designed evaluate effects combined monensin (MON; 30 mg/kg dry matter; (DM)) and virginiamycin (VM; 25 DM) high-concentrate during adaptation periods on performance, carcass traits, feeding behaviour, blood gas profile, morphometrics apparent total...

This study aimed to assess the influence of lamb finishing systems on zootechnical performance, as well carcass and meat quality. The experiment was conducted at APTA’s experimental farm. Thirty-three lambs were used – both sexes, initial age 90 ± 3 days, Texel with Santa Inês, each animal being one unit, 6 males 5 females per treatment. Treatments consisted of: finished pasture, in semi-feedlot or feedlot. slaughtered average live weight 35 kg. Weight gain measures taken by ultrasound....

The objective of this study was to examine the relationship DMI fluctuation, feedlot performance, feeding behavior, rumen morphometrics, and carcass characteristics in Nellore cattle classified by residual feed intake (RFI). One experiment conducted 2 consecutive years using individual pens (1.0 × 7.0 m) at São Paulo State University feedlot, Dracena campus, Brazil. year 1 started June 2012 with forty-eight 20-mo-old yearling bulls an initial BW 358.2 ± 19.4 kg. January 2013 sixty 402.5 33.0...

The energy content of finishing diets offered to feedlot cattle may vary across countries. We assumed that the lower is diet, shorter can be adaptation period high-concentrate without negatively impacting rumen health while still improving performance. This study was designed determine effects periods 6, 9, 14 and 21 days on performance, feeding behaviour, blood gas profile, carcass characteristics morphometrics Nellore cattle. experiment as a completely randomised block, replicated 6 times,...

Feed additives used in finishing diets improve energy efficiency ruminal fermentation, resulting increased animal performance. However, there is no report evaluating the effect of BEO associated with exogenous α-amylase response to starch content feedlot diets. Our objective was evaluate increasing levels diet a blend essential oils plus amylase or sodium Monensin on performance, carcass characteristics, and cecal morphometry cattle. 210 Nellore bulls were (initial body weight 375 ± 13.25),...

The growth hormone 1 gene (GH1) is a candidate for body weight and gain in cattle since it plays fundamental role regulation. We investigated the GH1 AluI DdeI restriction enzyme polymorphisms, located 149 bp apart genome, as possible markers of production potential Canchim crossbreed cattle, 5/8 Charolais (Bos taurus) 3/8 Nelore indicus) breed developed Brazil, by evaluating birth weight, weaning yearling plasma insulin-like factor-1 (IGF-1) concentration 7 month to 10 months old calves (n...

The objective of this study was to evaluate the effects feeding cattle with isoprotein and isoenergetic diets, without addition polyclonal antibody preparation (PAP), yeasts (YST) or monensin sodium (MON) on performance, carcass characteristics gain cost in feedlot. Ninety-five 20-month old bullocks (323.3±21.8 kg) were distributed 25 pens. completely randomized experimental design had a 2 × + 1 factorial arrangement treatments replicated 5 times. There no effect MON for DMI throughout...

Until 1990, beef cattle production in Brazil was recognized as an enterprise of low investment, cost production, well extensive system that used large land areas to be economically feasible. The situation changed for the Brazilian market when economy stabilized 1994 and all sectors involved supply chain were able predict their associated costs profits. During same period, purchasing power population grew, a consequence, consumers began demand higher quality products. This new scenario late...

The objective of this study was to evaluate the effects replacing monensin (MON) with a spray-dried multivalent polyclonal antibody preparation (PAP) against several ruminal microorganisms on feedlot performance, carcass characteristics, feeding behavior, blood gas profile, and rumenitis incidence Brangus Nellore yearling bulls. designed as completely randomized design 2 × factorial arrangement, replicated 6 times (4 bulls per pen total 24 pens), in which (n = 48) each biotype were fed diets...