The objective of this work was to investigate artificial fertilization and the duration of sperm motility in pacu with different insemination doses, water volume, and in natura semen preservation. It was carried out four experimentsfor evaluation of insemination doses (7×103, 7×104, 7×105, 7×106, and 7×107 spermatozoa oocytes-1) on the artificial fertilization of oocytes; the effect of water volume (0.5, 15.0, 30.0, 45.0, and 60.0 mL water mL-1 of oocyte) with insemination doses of 105,481 and 210,963 spermatozoa oocytes-1; the effect […]

A total of 1,500 larvae of Nile tilapia was distributed in 15 20-L aquaria (100 larvae in each one) to compare two methods of masculinization: via oral application, using a diet with hormone (60 mg 17α-methyltestosterone.kg-1); and through immersion bath (6 mg 17α-metyltestosterone.L-1), each one with five replicates. Larvae and juvenile were sampled on day 1 (beginning of the experiment) and on days 30 (end of hormone feeding period), 40, 45, 60 and 90. One sample with 0.5 g of […]

The objective of this study was to evaluate the agronomic characteristics, bromatological-chemical composition and digestibility of 11 corn cultivars (Zea mays) harvested at two cutting heights. Cultivars D 766, D 657, D 1000, P 3021, P 3041, C 805, C 333, AG 5011, FO 01, CO 9621 and BR 205 were evaluated when they were harvested 5 cm above ground (low) and 5 cm below the insertion of the first ear (high). The experiment was designed as random blocks, with […]

The objective of this study was to investigate components of production and seed production of two Paspalum species. It was evaluated two ecotypes of Paspalum notatum and Bagual) and two ecotypes of Paspalm urvillei (André da Rocha and Eldorado do Sul). It was used a complete randomized experimental design, in a factorial scheme (ecotypes x days after planting), with five replicates nested within days after planting. Each species was analyzed separately for determination of the components of production and seed […]

The objective of this study is to evaluate morphogenetic and structural characteristics as well as forage accumulation on Brachiaria decumbens pastures according to the site of cattle feces. It was evaluated two grazing areas: near and far from the droppings. The design used was a random block design, with three replicates. Tillers were tagged on the pasture for evaluation of length of the leaves and stems. Leaf appearance and death were also recorded. Stem elongation rate was 80% higher and […]

The objective of this research was to evaluate variability and heritability of quantitative traits related to forage quality of 32 clones of elephant grass (three local controls, from Zona da Mata de Pernambuco, and the remaining from RENACE/CNPGL). A complete randomized design was used with additional controls and analyses of variance was applied by using the procedure of families with controls between rows. Evaluation was performed during the dry period, at 60 days of growth. It was observed significant differences […]

Root traits of Panicum maximum Jacq. Cv. Tanzânia were evaluated in response to a nutritive solution with combinations of nitrogen and calcium rates. Ground quartz was used as substrate in an experiment carried out in a greenhouse in the spring, using a complete randomized block design, with four replications, in a fractionated 52 factorial scheme, with 13 combinations of nitrogen and calcium, in mmol/L: 2-0.5; 2-3.0; 2-5.5; 9-1.75; 9-4.25; 16-0.5; 16-3.0; 16-5.5; 23-1.75; 23-4.25; 30-0.5; 30-3.0, and 30-5.5. After the […]

The objective of this work was to evaluate the morphogenetic and structural characteristics of xaraes palisadegrass submitted to three cutting heights (15, 20 and 25 cm) when the sward reached 95% of light interception during regrowth. The experiment was carried out according to a complete randomized block design with three replications. The sward surface height under the cutting condition of 95% of light interception was very homogeneous with values around 30 cm. The increase in cutting height reduced the leaf […]

The objective of this study was to evaluate the effect of different doses of liquid swine slurry on dry matter accumulation rate and nutritive values (crude proten and neutral detergent fiber) of Tifton 85 grass pasture cultivated in southwestern Paraná from October 2005 to March 2006. It was used a complete random experimental design in a 4 x 4 factorial scheme composed of four doses of swine slurry in the plots (0, 80, 160 and 320 m3/ha) and four consecutive […]

The experiment was carried out to characterize a manipulated caatinga and to estimate the botanical composition and quality of diet for fistulated steers. The experiment was carried out during the rainy season from March to July, 2003. Caatinga was browsed by 24 Guzerá and 12 Girolando breed heifers and by two esophageal fistulated steers. In caatinga, it was identified 24 families, 38 genus, and 41 species in the two studied strata (out of them, ten species were found in the […]