This work consisted in testing the efficiency of a masculinizing hormone (17b-hydroxy-17-methyl-androxy-4-en-3-one) in the sex reversal of bullfrog tadpoles. Three hundred and fifty two tadpoles with two or three months old, from the stages 30 to 36, were used to test four levels of hormone in the ration (0, 30, 60 and 90 mg/g), for 45 days. After metamorphosis, 167 juveniles were sacrificed and 185 were reared until the fourth month of age and sacrificed thereafter. Macroscopic analysis of the […]

The effects of the temperature and of the photoperiod on the bull frog sexual maturation of frogs weighing 94.22 g ± 12.03, maintained for thirty days under temperatures of 20, 23, 26, 29, 32 and 35°C, with photoperiod of 12/12 hours of light/hours of darkness (h L/D), were evaluated. Temperature affected the weights of the fat body and liver, that varied according to quadratic models, and higher weights of fat body at 27.27°C and of liver at 26.81°C were considered. […]

This experiment was carried out to evaluate the effects of addition of different levels of phytase (0, 500, 1500 and 3000 units of active phytase [UFA]/kg diet) in the diets for Nile tilapia (8.88 ± 0.02 g). All diets were fed to satiation daily for 45 days. The phytase level determination was based on the performance and digestibility parameters and was estimated by the quadratic and/or the broken line models. The broken line model showed a better adjustment for phytase […]

The research was conducted at the EMBRAPA – National Center for Goat Research, in Sobral, Ceara, Brazil, to evaluate the effects of cutting of the above ground parts in relation at regrowth height of marmeleiro on its survival, persistence, regrowth vigor and subsequent production of herbaceous understory phytomass. The plants were cut at 10.0 cm above ground, when the regrowth reached four different heights (25, 50, 75 and 100 cm). The cutting treatments were applied on plots of 5 m […]

This experiment was conducted at the Brasília Agricultural College – Federal District, and studied the dynamics of appearance and death of tillers as well as leaf elongation in three positions of the stump (central, intermediate and peripheral) of Paspalum atratum cv. Pojuca, submitted to four rotational grazing cycle of 10 days use and 30 days resting. A descriptive analysis was applied using a hierarchical model. Nitrogen was applied at a rate of 40 kg/ha, in the form of ammonium sulfate […]

Lambs performance fed on creep feeding and fedlot were evaluated at two experiments. In the first experiment, thirty two 3/4 Suffolk lambs were fed on creep feeding, weaned at 56 days of age and, after, were confined. Lambs were fed four different treatments: 1. without supplemmentation; 2. supplemmentation with ground corn and soybean meal; 3. ground corn, soybean meal and 15% alfalfa hay; 4. ground corn, soybean meal and 30% alfalfa hay. After weaning, lambs that received concentrate supplemmentation were […]

Twenty 3/4 Suffolk male lambs were fed ground and pelleted diets and slaughtered at 26 and 28 kg of liveweight. Diets were isoprotein (21% CP) and isoenergetic (2.9 Mcal ME/kg DM). Lambs had free entrance on creep feeding, staying with their mothers until reaching slaughter weight. Pelleted diet resulted in higher hot dressing-out percentages (54.18% for pelleted diet and 52.04% for ground one) and higher true dressing-out percentages (58.37% for pelleted diet and 56.66% for ground one). Hot and cold […]

Leaf blades and stem segments at two stages of development (day of leaf ligule exposure and 20 days thereafter) and two insertion levels on tillers (lower and upper) of signalgrass (Brachiaria decumbens), molassesgrass (Melinis minutiflora) and tifton 85 bermudagrass (Cynodon sp), were sampled in two seasons of the year (summer and autumn). The anatomical and chemical traits, and in vitro dry matter digestibility of blades and stems segments were evaluated. The correlations among these variables were established to associated values […]

Chemical composition and the in vitro dry matter digestibility were evaluated in blades and stems at two stages of development and two insertion levels on tillers of signalgrass (Brachiaria decumbens), molassesgrass (Melinis minutiflora) and tifton 85 bermudagrass (Cynodon sp), in two seasons of the year (summer and autumn). Lower and upper leaf blades were sampled from the tillers, on the day of ligule exposure and 20 days thereafter, and stems segments located below of the upper leaf blade. The crude […]

The genus Adesmia DC. has 17 species native to Brazil, distributed in the Southern states, whose importance is linked to its adaptation to the soils and climatic conditions of the region, besides being an active winter-growing species (temperate). This work aimed to compare the patterns of dry matter (DM) accumulation and nutritive value of A. latifolia, A. punctata and A. tristis, using Lotus corniculatus (birdsfoot trefoil) and L. uliginosus (big trefoil), as checks. The experiment was carried out in the […]