Four hundred and thirty-two Nile tilapia (Oreochromis niloticus) fingerlings averaging initial weight of 0.60 ± 0.02 g were allotted to thirty-six 150 L-aquaria to determine total phosphorus requirement. The experiment was analyzed as a completely randomized design, with six treatments (0.55, 0.73, 0.94, 1.14, 1.37, and 1.59% of total phosphorus), six replicates and 12 fishes per experimental unit. The fishes were fed diets with 32% of CP and 3,000 kcal of DE/kg, during 40 days. Quadratic effect was observed for […]

The apparent digestibility coefficients of DM, protein and energy of five ingredients (soybean meal, corn gluten meal, fish meal, broken rice and ground corn) were determined for jundia juveniles (78.5 ± 9 g). The indirect method was adopted for nutrient digestibility estimate. Chromium oxide (0.5%) was added to the diet as marker, and feces were collected by sedimentation every four hours. Among all tested ingredients, corn gluten meal showed the highest apparent digestibility coefficients (95.0% of protein, 88.0% of energy […]

The aim of this work was to determine the centesimal composition and fatty acids profile of freshwater prawn (Macrobrachium amazonicum) for determination of its nutrient potential. Six lots (each one with 100 g) containing whole prawns with individual mass ranging from 0.9 to 1.2 g were triturated and stored for posterior chemical analysis. The average values for moisture, ash, CP and total lipids were as follows: 70.3, 1.5, 24.8, and 1.5%, respectively. It was detected 36 varieties of fatty acids, […]

Thirty-six lactating Holstein cows averaging 258 days in milk were used to study the supplementation of yeast culture (Levucell SC20 – Lallemand) in dairy diets with two starch contents (22 vs. 32%). The lowest starch content was obtained by partial (50:50) replacement of finely ground corn by dried citrus pulp. A replicated 4 x 4 Latin square design was used with four periods of 24 days each. The first 20 days were used for diet adaptation and the last four […]

The objective of this trial was to evaluate the effect of body condition score (BCS) and different dietary net energy (NE) levels during prepartum on performance and concentration of plasma non-esterified fatty acids (NEFA) in early lactating dairy goats. Animals (four replicates per treatment) were assigned to a completely randomized design in a 2 x 3 x 2 factorial arrangement of treatments (two BCS, three levels of prepartum NE and two levels of postpartum NE). In the beginning of the […]

Twelve Holstein lactating dairy cows were blocked by days in milk and randomly assigned to three replicated 4 x 4 Latin square to evaluate the effect of different protein sources on efficiency of microbial protein synthesis, concentration of serum (NUS) and milk (MUN) urea nitrogen, and ruminal metabolism. A basal corn silage diet (60% of the total dry matter) was fed plus one of the following proteins sources (DM basis): soybean meal (SBM), cottonseed meal with 38% of crude protein […]

Twelve Holstein lactating dairy cows were blocked by days in milk and randomly assigned to three replicated 4 x 4 Latin square to evaluate the effect of different protein sources on intake, nutrient digestibility, and milk production and composition. A basal corn silage diet (60% of the total dry matter) was fed plus one of the following proteins sources (dry matter basis): soybean meal (SBM), cottonseed meal with 38% of crude protein (CSM38), cottonseed meal with 28% of crude protein […]

Chromium oxide and n-alkanes (C31:C32 and C33:C32) were used to estimate the dry matter intake (DMI) of lactating Holstein x Zebu cows grazing elephant grass. Extrusa samples of forage were obtained from a cow with esophageal fistula. Fecal grab collection was done twice a day at 7:30 and 14:30 h during 9 days in each experimental period. A randomized complete block design with a split-plot arrangement was used. Both pairs of n-alkanes estimated similar DMI, independent of time of fecal […]

The objective of this trial was to estimate chemical composition, digestibility and ruminal degradation kinetics of silages from four sunflower hybrids: Rumbosol-91 (forage), M-734 (double purpose), C-11 (double purpose) and BRS-191 (grain) sowed in October (early), November (normal) and December (late). A randomized complete block design in a 4 x 3 factorial arrangement (four hybrids x three seeding dates) with three replicates was used. Dry matter values ranged from 23.2 to 43.0%, pH from 4.0 to 5.1, and NH3-N%/TN from […]

This study was conducted to evaluate the effect of pregnancy simulation (placement of 100 lead spheres in the uterus-LEAD) and ovariectomy (OVAE) on traits of carcass and meat of heifers finished in feedlot. Animals not pregnant and with intact ovary were used as the control (CTRL). Nineteen crossbred heifers (½ Nelore x ½ Red Angus) averaging 18 months of age and 257.8 kg of body weight were used. Animals were fed a diet containing (% DM): 41% of corn silage […]