The experiment was conducted to determine the forage potential of the Arachis pintoi submitted to 0, 30, 50 and 70% of shading, in silvopastoral systems and as ground cover in agroforestry systems. The experimental design was a completely randomized design with four replications. An evaluation was carried at the end of the rainy season and another at the end of the dry season, using the caracteristics height and plant vigor, ground cover, and total, above and below ground biomass. The […]

The experiment was carried out at Piracicaba, SP, over one year, with two alfalfa cultivars (Crioula and CUF-101) grown in pots at open field. The weight and the basal shoot numbers were evaluated. The regrowth dynamics after the cut and seasonally of production using three cutting frequencies, 28, 35 and 42 days, and three defoliation intensities, cuts at 7 cm height with or without preservation of remaining leaf area and cut at soil level were evaluated. A completely randomized experimental […]

This experiment was conducted to compare the tannin content of four sorghum varieties using six quantitative methods of tannin determination. A completely randomized design in a 4 x 6 (variety x method) factorial arrangement with four replicates was used, where: T1: Folin Denis (Folin Denis reagent reflux); T2: Folin Denis (water reflux); T3: Folin Denis (water reflux followed by filtration); T4: Lowental, T5: Vanilin cloridric acid of Burns, and T6: Vanilin cloridric acid modified of Burns. The highest tannin content […]

The production and quality of forage of annual temperate grasses mixtures under continuous grazing condition were evaluated. The mixtures used were: T1 – Triticale (X Triticosecale) plus ryegrass, T2 – Oat (Avena strigosa) plus ryegrass, and T3 – Triticale plus oat plus ryegrass. Broadrast sowing occurred at 04/21/95, being the area fertilized with 200 kg/ha (05-30-15). The broadcast fertilization was of 175 kg/ha of nitrogen in urea form and it was subdivided in four applications. The establishment of the pasture […]

Data growth records relative to 2004 Nellore breed calves, from Ceará and Piauí states, were used to study the influence of environmental effects and to estimate the heritability of the weight traits at the 365 days (yearling) and 550 days (post-yearling) of age. The variance components were estimated by the restricted maximum likelihood method. In the analysis of variance a model that included the fixed effects of sex, year and season and herd of birth, and the age of dam […]

The effects of genetic and environmental factors on reproductive traits, from 475 records of calving interval (CI) and 401 of real fertility (RF) of Nellore cows reared at Santa Inês county, Maranhão State, in pasture grazing system with supplementation in the dry season, from 1980 to 1994, were studied. The data were analyzed by means of linear models, which included the sire effect (random effects), month and year of the last and the actual calving, calving number and sex of […]

The objective of this work was to present a reparametrization of a means deviation model from contemporary groups up to an unrestricted animal model (Lush’s mixed model equations – LMME). Applying restrictions on the LMME, the animal model was obtained in accordance with Henderson (Henderson’s mixed model equations – HMME). To obtain the HMME, restrictions of the type were imposed and these demanded the necessity of unrealistic assumptions, as the absence of selection, so that the HMME properties could be […]

The objective of this work was to determine the frequency of the porcine stress sindrome (PSS) gene mutation and its association with reproductive traits in crossbred gilts. Seventy two crossbred Landrace x Large White females from commercial farms of Ponte Nova region location – Minas Gerais State, were analyzed for the PSS mutation. The mutation diagnose was made by polimerase chain reaction – restriction fragment length polimorphism, where the 659pb fragment from the ryr-1 gene was amplifyied, and in the […]

Milk production data of 19,151 lactations from 8,984 cows, daughters of 795 Gyr sires were used to genetically evaluate cows. Mixed model equation was used to predict sire-breeding values that were incorporated in the selection index of the cows. Besides the selection index, animal models were also used to predict the genetic value of the cows, using only the first lactation or up to five lactations per cow. The accuracies of the predictions obtained by cows breeding values, using the […]

The direct effect of Red Angus (), computed as deviation from the direct effect of Nellore (), and the effects of individual () and maternal () heterozygosity, resulting from crossing these breeds were estimated. The multiple regression method was used to analyze birth weight (PNT), weaning weight (PDS), yearling weight (P12M), and for the daily weight gain from birth to weaning time (GMD_ND) and from weaning to 12 months (GMD_DA). A total of 410 calves from the groups of Nellore, […]