The objective of this study was to evaluate body condition, weight, weight gain, food intake and efficiency of feedlot finished steers, purebreds (Charolais – C and Nellore – N), crossbreds from second (G2) (¾C ¼N and ¾N ¼C), third (G3) (5/8C 3/8N and 5/8N 3/8C) and fourth (G4) (11/16C 5/16N and 11/16N 5/16C) generations of rotational crossbreeding. The steers were fed the same diet containing 12.32% crude protein, 2.96 Mcal digestible energy/kg of dry matter and roughage:concentrate ratio of 52: […]

A static, empirical and determinist model of ingestion, retention and excretion of N and P was developed for the Brazilian pig production. The general principles were: technological systems (ST), animal categories, N and P in the diets, and digestive and metabolic efficiencies of N and P. The model integrates three aggregation levels, being constituted by ten compartments (ingestion, gastrointestinal contents, retention, and excretions of P and N), 300 sub-compartments (50 related to ST and 250 to animal categories). The ST […]

This trial was carried out to evaluate the effects of feeding Tilapia fillet by-products meal (TF) for piauçu (Leporinus macrocephalus) fingerlings. One hundred and twenty-five fingerlings averaging weight of 0.19 ± 0.004 g and length of 2.37 ± 0.28 cm were assigned to a completely randomized design with five treatments of five replicates. The diets were formulated to contain levels of 0, 5, 10, and 15% of TF and 0% of TF plus methionine. Diets were fed at 10% of […]

This trial was carried out to evaluate the effects of replacing soybean meal with hydrolyzed protein of the cellular content of yeast (HPCCY), isolated protein of soy (IPS), hydrolyzed protein of intestinal mucosa membrane of swine (HPIMS) and dried whole milk on intestinal mucosa membrane morphology and pancreas development of weaned pigs at 7 and 14 days post weaning. Fourty-four piglets (averaging 5.5 ± 0.6 kg) were fed the following isonutritive diets: SM – yellow corn-soybean meal based diet; DWM […]

It was assessed the evolution of tillering, forage biomass, leaf area index (LAI), interception of photosynthetically active radiation (IPAR), efficiency of radiation use (ERU) in Panicum maximum “cv” Mombaça during the regrowth period of the grass, in the Summer and Autumn seasons. Similarly, grass growth indices were assessed: net assimilation rate (NAR), leaf area ratio (LAR) and relative growth rate (RGR). All these variables were estimated from field observations taken on the 7th, 14th, 21st, 28th, 35th, 42nd and 49th […]

This trial was conducted to evaluate the effect of the environmental temperature on performance, carcass composition and physiological parameters of swine from 15 to 30 kg. Thirty-six barrow (Landrace x Large White) averaging initial weight of 14.97 + 0.56 kg were assigned to a completely randomized experimental design with three treatments and six replicates of two animals. The experimental period lasted 23 days. The treatments were as follows: T1 animals on heat stress (35ºC) fed ad libitum; T2 animals on […]

The objective of this study was to evaluate the effects of recombinant bovine somatotropin (rbST) on production, carcass traits, and plasmatic concentrations of IGF-I and thyroid hormones on crossbred Angus-Nellore male calves. Thirty-six calves averaging 63 ± 17 days old and 76.8 ± 14.7 kg of body weight (BW) grazing Brachiaria decumbens and creep fed were randomly assigned (18 calves per treatment) to one of two treatments until weaning (217 days) as follows: I) 1.4 mg of rbST (Boostin®)/kg of […]

A 45-d experiment was conducted to evaluate two breeding ages of Hereford heifers, 18 (18M) or 24 months (24M), using natural mating. The following parameters were studied: pregnancy rate (PR), body condition score at the beginning of the mating season (BCS), and average daily gain in the mating season (ADG). It was also calculated the productivity (P) = total kg of weaned calf per number of heifers bred and efficiency (E) = productivity per 100 kg of heifers mated. The […]

One hundred Nile tilapia juveniles (Oreochromis niloticus; BW= 100.0 ± 5.0 g) were assigned to 10 experimental cages to evaluate the effects of phytase supplementation (0, 1,000, and 2,000 FTU/kg) on calcium (Ca), magnesium (Mg), zinc (Zn), copper (Cu), iron (Fe) and manganese (Mn) availability of ten feedstuffs: five energetic (corn, extruded corn, wheat meal, rice meal and low-tannin sorghum) and five protein (extruded soybean, soybean meal, sunflower meal, cottonseed meal and corn gluten meal). As reference, an albumin and […]

To evaluate the pattern of defoliation in a Mombaça (Panicum maximum) grass pasture, experimental paddocks were grazed by Holstein heifers to maintain canopy height of: 60, 80, 100, 120 and 140 cm height. The experimental design was completely randomized, with two replications. The assessed sward structures were: canopy height; herbage and leaf lamina mass; canopy, sheath plus stems and leaves bulk density; tiller density and number and length of fully-expanded and emerging leaves. Linear decrease in plant defoliation probability (Y= […]