It was utilized data from 188 animals from ten genetic groups. For the statistical analysis, the animals were grouped into three subgroups according to age, sex and diet. Thus, the subgroups analyzed were: 1) intacted yearling males receiving the “a” ration: 39 Nellore (N), 12 Brangus (BR), 8 1/2 Simmental – 1/2 Nellore (SN), 8 1/2 Caracu – 1/2 Nellore (CCN), 21 1/2 Valdostana – 1/2 Nellore (VAN); 2) intacted weaned males receiving the “b” diet: 12 N, 12 1/2 […]

Records of body weight at selection of Nelore cattle pertaining to the Sertãozinho’s Experimental Station (SP-Brasil) Nelore herds were used to study the influence of the incorporation of additional information on the estimation of annual genetic trend by least squares and mixed model methodologies. The genetic changes in all three Nelore herds (control-NeC and selected-NeS and NeT) or only in the selected ones (NeS and NeT) were estimated, only for the females, by least squares, by mixed model including their […]

A total of 335 records of swine litters from 102 Large White females that farrowed between 1985 and 1996, born in the seasons of september to february and march to august, in the Recife city, in Pernambuco state (Brazil), were analysed. The objective was to compare regression equations to predict stillborn rates. Angular transformation (TA), a generalized linear model (GLM) with binomial distribution and logit link (BL), a Poisson GLM with log link (PL), a mixed GLM (GLMM) with binomial […]

Records of 24,703 Nelore cattle from six herds were used to estimate coefficients of heritability for probability of pregnancy at 14 months (PP14) and hip height (HH) traits. For PP14, the mathematical model included as fixed effects the contemporary groups (181 groups) and dam age class at calving (7 classes) and for HH only contemporary groups (584 groups). Random effects included were genetic additive of sire and residual effects. Variance and covariance components were obtained by method Â. Heritability estimates […]

The present work was designed to verify the effect of the use of phytase and xylanase upon the performance and bone deposition of minerals in broiler diets containing 15% of rice bran, low available phosphorus and without supplementation of iron, zinc, copper and manganese. The phytase utilized was the Natuphos 5000 and the xylanase Avizyme 1300. The experimental design was the completely randomized and the analysis of variance in a 4×2+1 factorial scheme. The control diet was made up of […]

Two experiments were carried out, with the aim of evaluating the use of corn processed or not by extrusion, in the feeding of growing rabbits. In the experiment 1, 21 White New Zealand rabbits, 12 males and 9 females, with 55 days of age, were used on digestibility assay, with the aim of determining the nutritional value of corn, extruded or not. The rabbits were distributed in a completely randomized design with three treatments and seven replications, with one reference […]

Three hundred and sixty 45-days old female quails, averaging 137.0 g, were used during four experimental periods of 28 days each. A completely randomized block design, with six replicates and ten females per experimental unit, was used to study the digestible methionine plus cystine requirement and the best digestible methionine plus cystine: digestible lysine ratio (0.60, 0.65, 0.70, 0.75, 0.80 and 0.85), on the rate of eggs production (%), egg weight (g), eggs mass (g of eggs/quail/day), feed intake (g), […]

Five hundred and forty 7-days old female quails, averaging 21.50 g, were used during 35 days. A completely randomized blocks design with five replicates and 18 females per experimental unity was used to study the effect of six digestible methionine plus cystine: digestible lysine ratios (0.48, 0.53, 0.58, 0.63, 0.68 and 0.75) on the traits evaluated during the growing period. Final weight (g), weight gain (g), feed intake (g), feed conversion (g/g), feather rate (%), chemical composition (%) (dry matter, […]

Three hundred 49-days old Japanese female quails, averaging 138.0g, were used to estimate the requirement of digestible lysine level for Japanese quail in completely randomized block design with five replicates of ten females per experimental unit. The treatment consisted six levels of digestible lysine (0.80, 0.90, 1.00, 1.10, 1.20 and 1.30%) and the analyzed traits were rate of egg production (%), egg weight (g), egg mass (g of eggs/quail/day), feed intake (g), feed consumption: weight gain ratio (g of diet/g […]

With the objective of evaluating increasing levels of calcium in diets supplemented with the enzyme phytase for chickens from 1 to 21 days of age, an experiment was conducted using 600 1-d old Hubbard-MPK strain chicks. The broilers were allotted to a completely randomized design, factorial arrangement five x two (levels of calcium x sexes), three replicates and 20 birds per plot. The basal ration with 0.54% total phosphorus and 600 units of phytase/kg, was formulated to meet the nutritional […]