The objective of this study was to evaluate the effects of stalk/leaf ratio and the stage of maturity on the digestibility of the corn plant. Hybrids AG1051, AG4051, AG5011, DOW2B710, DOW2C577, DOW2A525, NB7315 and P30F90 were used, harvested at the one-half milk line (½ ML), three-quarters milk line (¾ ML) and black layer (BL) stages. A randomized block design was used in an 8 (hybrids) × 3 (stages of maturity) factorial design, with three replications. The means generated were used […]

The objective of this study was to evaluate the agronomic divergence of 25 sorghum hybrids (Sorghum bicolor L. Moench) in the semiarid region of Paraiba. A randomized block design with three replications was used for evaluation of plant height (PH), total natural matter production (TNMP) and total dry matter production (TDMP) and the percentage of components of DM (panicle, leaf blade, stem and dead matter) of the following hybrids: 866005, 866019, 866033, 866034, 866035, 866036, 866037, 866040, 866041, 866042, 866043, […]

The aim of this work was to select higher yielding and persistent genotypes, evaluating their progenies agronomically. The DM yield of 22 progenies compared with the population of UFRGS-2004-2 and with the Jacuí cultivar of white clover mixed with ryegrass (Lolium multiflorum Lam.), during the years 2008 and 2009 was evaluated. The average DM yield of white clover during the two years was 3671 and 2107 kg/ha, in Eldorado do Sul and Bagé, respectively. In Eldorado do Sul and Bagé […]

The objective of this study was to evaluate the morphogenic and structural characteristics of tifton 85 bermudagrass under different nitrogen doses (0, 33, 66, 100 or 133 kg/ha.year of N) and three different plant heights (30, 40 or 50 cm) at harvesting time. A split plot scheme in a completely randomized design with three replications was used. The nitrogen (N) doses stood for the portions and the haversting heights, for the subportions. The leaf appearance rate of tifton 85 bermudagrass […]

The objective of this study was to evaluate gas exchange in the massai grass during establishment and regrowth cycles in a greenhouse, using five nitrogen (N) fertilization levels. A completely randomized split-plot design of five nitrogen levels (0; 150; 300; 450 and 600 mg N•dm-3 of soil) was employed with the N levels as plots, and the cycles (establishment, regrowth 1 and 2) as subplots, evaluated with five replicates. We evaluated leaf transpiration (E), leaf temperature (TFOL), leaf photosynthesis rate […]

The biological nitrogen fixation (BNF) of Desmanthus pernambucanus (pigeon bundleflower), Macroptilium martii and M. lathyroides (wild bushbean), grown in soils from the semiarid region of Paraíba, manured or not, was evaluated in a pot experiment. Nodule number and biomass, N content and the proportions of fixed N (%Ndfa) were estimated, using the natural abundance methodology and buffel grass as a reference plant. The legume plants nodulated abundantly in all three soils, manured or not, except when grown in Fluvic Neosol […]

The present study aimed to investigate the stimulant effect of five amino acids (alanine, arginine, glycine, histidine and lysine) from betaine and their mixtures on the ingestion rates of formulated diet during the larval development of pacu Piaractus mesopotamicus. The statistical results showed significant effect of age and treatment. However, no significant effect was observed for the interaction of both factors. Glycine, lysine and betaine are considered good stimulants of the pacu feeding behavior.

This study was developed to evaluate the performance and carcass composition of tambatinga fingerlings, with initial weight of 6.521 ± 0.300 g, fed with isocaloric, isocalcic and isophosphoric diets (40, 37, 34, 31 and 28% of CP). Fish were cultivated for forty days in polyethylene tanks, with water recirculation system. Fishes were weighed at the beginning and at the end of the trial and the data were used for evaluation of weight gain, feed intake, apparent feed conversion, index of […]

The objectives of this research were to determine physico-chemical characteristics of 1,758 Apis mellifera L. honey samples produced by in the productive pole of Picos, state of Piauí, to understand, based on these characteristics, how they are grouped and to determine the percentage of honey that fit the specifications determined by Brazilian legislation. Thirty-five honey samples were collected directly from beekeepers for determination of total sugars, reducing sugars, apparent sucrose, humidity, diastase activity, hydroxymethylfurfural (HMF), protein, ash, pH, acidity, formol […]

The objective of this study was to evaluate the influence of crossings between sheep breeds on the intrinsic quality of leather. It was used the skins of 36 lambs (18 females and 18 males), resulting from crosses between ewes of a native breed from the Brazilian state of Mato Grosso do Sul and rams of the same native breed as well as the Texel and Santa Inês genetic groups. The animals were raised in confinement until slaughter weight, from 28 […]