A meta-analysis was conducted to summarize published heritability of estimates growth traits of zebu beef cattle of 186 reports. The factors affecting weighed heritability estimates were analyzed by the least square means method for a model including fixed effects. Breed and estimation method were the significant factors in the four traits (birth weight, weaning weight, weight at 365 days and weight at 550 days). Estimation method is always recommeded to summarize these estimates. The pooled heritability estimates for birth weight, […]

The objective of this research was to compare the effects of different doses of application of sodic cloprostenol (doses equivalent to 50% the conventional), in the intramuscular (IM) and intra-vulvosubmucosal (IVSM) vias on the synchronization rates, interval of application to estrus and decrease of seric progesterone concentrations. One hundred and ninety-nine females, 103 with of previus report estrous and 96 without report of previus estores evaluated by rectal palpation to verify the presence of corpus luteum, were randomly divided into […]

Two experiments were conducted with the objective of evaluating the lysine requirements for Ross broilers, males, from 22 to 42 and 43 to 49 days old, maintaining 71% met + cys:lys ratio. Nine hundred broilers averaging initial body weight of 780 g at 22 days old and 2.556 g at 43 days old were used in each experiment and allotted to a completely randomized experimental design, with six treatments, six replicates and 25 birds by experimental unit. The treatments consisted […]

Two experiments were conducted with the objective of evaluating the methionine + cystine (Met + Cis) requirements, for Ross broilers, males, from 22 to 42 and 43 to 49 days old. Nine hundred broilers averaging initial body weight of 0.800 kg at 22 days old and 2.540 kg at 43 days old were used in each experiment and allotted to a completely randomized experimental design, with six treatments, six replicates and 25 birds for experimental unit. The treatments consisted of […]

Four feeding schedule were investigated for broiler breeders: at 6:30 am; 50% feeding at 6:30 am and 50% at 3:30 pm (dual); at 11:00 am, and at 3:30 pm. Arbor Acres breeders were randomly assigned to 48 boxes, with 12 replicates of 27 females and three males each. The nutritional levels and management procedures were those recommended for strain. The variables studied were: total egg production, nest, clean and broken egg production, in six collections (6:30 am, 9:00 am, 11:00 […]

The experiment was carried out to establish the lysine requirement of females swine, from 6 to 16 kg live weight. Sixty crossbreed gilts with high genetic potential for lean gain and average initial and final weight of 6.0 ± 0.21 kg and 16.0 ± 0.32 kg, respectively, were assigned to a randomized blocks design, with five treatments, four replications and three animals per experimental unit. The treatments corresponded to a basal diet with 21.60% crude protein, supplemented with five levels […]

The apparent metabolizable energy (AME), nitrogen corrected apparent metabolizable (AMEn), apparent metabolizability coefficient (AMC) and nitrogen corrected apparent metabolizability coefficient (AMCn) of five feedstuffs were determined. The feedstuffs investigated were: hatchery by-product meal (HM), feather meal (FM), poultry viscera meal (PVM) and two meat and bone meal (MBM 1 and MBM 2) of different origin. The values of AME and AMEn were determined by the total excreta collection method. One hundred and twenty broiler chicks at 21 days old were […]

This trial was conducted to evaluate the effect of antimicrobial supplementation (association of 50 ppm of colistin, 50 ppm of zinc bacitracin and 50 ppm of olaquindox) or herbal extract (based on thyme, clove and oregano at levels of 0, 700, 1,400 and 2,100 ppm) on Bacteria population of duodenum, jejunum, ileum and cecum of swine at 56 days old. Denaturing gradient technique in polyacrylamide gel electrophoresis (DGGE) of amplicons from 16S rDNA V3 region was used. The number of […]

The effect of yolks from birds hipperimmunized birds against Escherichia coli (E. coli) pathogenic for swine on the passive immunity of newborn piglets in a producer unit of piglets was studied. It was evaluated ELISA optical density (OD) of antibodies against E. coli, body weight and the frequency of diarrhea (FcD) in 137 newborn piglets born from 25 primiparous gilts non-vaccinated against E. coli. The gilts were considered blocks. From each gilt, six piglets from both sexes were separated, excluded […]

Sixteen mares of Mangalarga Marchador breed, averaging from 3.5 to 18.4 years old and 394.8 kg, were assigned to a randomized blocks (mares age) design, with four replicates by treatment, to evaluate the effects of replacing corn cob meal (CCM) with mesquite pod meal (MPM) on nutrient intake. In the digestion trial, the total feces collection method was used and the coefficients of apparent digestibility of dry matter (CDDM), organic matter (CDOM), crude protein (CDCP), acid detergent fiber (CDADF), neutral […]