The experiment was conducted to evaluate the effects of limestone particle size and the use of artificial light for laying hens in the second laying cycle. We used 240 Hisex White laying hens at 82 weeks of age in a completely randomized design in a 5 × 2 factorial arrangement, resulting in 10 treatments with 4 replicates of 6 birds. The variables were the five particle sizes obtained by increasing the proportion of thick limestone (0, 25, 50, 75 and […]

Apparent digestibility coefficients (ADC) of gross energy and dry matter (DM) and mineral availability were evaluated for eight protein-rich ingredients (corn gluten meal, soybean meal, cottonseed meal at 280.0 and 380.0 g/kg, poultry by-product meal, meat meal, fish meal and feather meal) in compound diets for Nile tilapia. Chromic oxide was used as inert digestibility marker. Higher ADC values of DM and energy were, respectively, 0.862 and 0.881 for corn gluten meal, 0.811 and 0.888 for poultry by-product meal; 0.729 […]

It was performed three trials to determine the nutritional levels of available phosphorus (aP) for males and females of the strain ISA Label in the starter (1 to 28 days), growing (28 to 56 days) and finisher (56 to 84 days) phases, reared in a free-range system. In each trial, 480 birds with age corresponding to rearing phase were housed in 24 experimental units with shelter and pasture areas. It was used a complete random experimental design, in a 4 […]

The objective of this work was to determine macromineral requirements by Zebu steers grazing Brachiaria decumbens supplemented with concentrate. It was used 24 non-castrated steers, at an average age of 7 months and at initial average weight 180 kg. Eight control animals were slaughtered for determining initial body composition. The 16 remaining animals were divided in four four-animal plots, in a complete random design. Each plot received mineral mixture or supplements at the levels 0.75; 1.50 or 2.25 kg/animal/day. The […]

The experiment was carried out to evaluate the effect of phytase enzyme supplementation in diets on the metabolizable energy (ME) and on the apparent ileum digestibility coefficients of the dry matter, crude protein, calcium and phosphorous, and to determine the deposition of ashes, calcium and phosphorous on the tibia of broilers. It was used 350 Ross male broilers from 16 to 25 days of age distributed in a complete randomized design with five diets and ten replicates of seven birds […]

A total of 520 1-d old male broiler chicks (Cobb) was fed a corn-soy-fat-free rice meal diet to evaluate the effect of phytase suplementation on performance and nutrient digestibility. The experiment was analyzed as a completely randomized experimental design with five treatments, eight replications of 13 broilers per replication. The percentage composition of the experimental diets were: positive control (PC) with 3000 kcalME/kg; 21.4% CP; 0.42% Pd and 0.96% Ca and negative control (NC) with 2940 kcalME/kg; 21.2% CP; 0.27% […]

Body composition and net and dietary requirements of macrominerals (Ca, P, Mg, Na and K) of genetically selected Caracu (CaS) and Nellore (NeS) for yearling weight (378 days of age) as well as of ordinary Nellore (control; NeC) were investigated in this trial. Fifty-six young bulls averaging 18 months of age were used. Twelve animals were slaughtered after an adaptation period and were used as reference. The 44 remaining animals, 16 NeS, 16 CaS and 12 NeC, with initial average […]

The effects of feeding different calcium levels and limestone particle sizes on body and morphometric development of the digestive tract in replacement pullets were evaluated in this trial. One thousand and four hundred Lohmann LSL replacement pullets were assigned to a complete randomized design with a 5 x 2 factorial (calcium levels and limestone particle size) and five replicates of 28 and 18 birds/plot, respectively, for the periods from 3 to 7 and from 8 to 12 weeks old. The […]

The objective of this trial was to determine the body composition and nutritional requirements of macrominerals for Morada Nova sheep. Thirty lambs averaging 15 kg of initial body weight (BW) and 70 days of age were used in this study. Six lambs (reference-animals) were slaughtered with 15 kg of BW to determine the initial body composition using the comparative slaughter methodology; six other lambs were slaughtered with 20 kg of BW (intermediary slaughter) and the remaining 18 lambs were distributed […]

An experiment was carried out to evaluate supplementation of sorghum straw (SS) with poultry litter (PL) in a single offering/day, and minerals and their effects on feed intake, sorghum straw dry matter disappearance (DMD) in nylon bags and rumen liquid ammonia N concentration. A 4×4 latin square design with 17-day periods and four rumen fistulated stalled cows was used to compare four treatments: (0) SS alone, (M) SS + mineral mixture offered ad libitum (P) SS + 1 kg/day of […]