The experiment was conducted with the objective evaluating the effect of supplementation of glycine in diets with different digestible threonine:digestible lysine ratios on the activity of enzymes that metabolize threonine. Five hundred and sixty male broiler chicks from the Cobb strain were used during the period of 8 to 21 days, distributed in a completely randomized design, in a 3 × 2 + 1 factorial arrangement, with 3 digestible threonine:digestible lysine ratios (55; 65 and 75%), with or without supplementation […]

An experiment with 630 one-day-old chicks experimentally inoculated with Salmonella Typhimurium was performed to evaluate the effects of an organic acid blend (benzoic, fumaric and 2-hydroxi-4-methylltio-butanoic – HMTBa) on intestinal health and performance. The experimental challenge with Salmonella Typhimurium occurred in two different routes of administration: via crop on the first day after hatching, and via feed, offered from seven to 14 days of age. These groups were treated with organic acids in a 3 × 2 (agent versus acid) […]

The study was conducted to estimate requirements of energy and crude protein for maintenance, weight gain and egg production of Japanese quails in the period of 67 to 107 days of age. Two experiments were performed: one, to determine the requirements for maintenance of protein, and the other, for energy. Experiments were conducted in a completely randomized design with four dietary levels of offer and four replicates of six birds. The diets offered were: ad libitum (100%), 75%, 50%, and […]

This experiment was carried out to estimate the metabolizable energy (ME) requirements for meat quails from 1 to 14 days of age. A total of 1,140 1-day old meat quails were distributed in a completely randomized design, with five treatments (2,750; 2,850; 2,950; 3,050 and 3,150 kcal of ME/kg), six replications and 38 quails per experimental unit. There was linear reduction of energy levels in body weight, feed intake and weight gain of birds. The feed conversion ratio showed a […]

This experiment was conducted to evaluate the oxidative stability of coconut meal treated with or without butylated hydroxytoluene (BHT) at different storage times and the effect of diets containing this ingredient on laying hens’ performance and egg quality. A 200-kg batch of freshly produced coconut meal was divided into five equal portions. One portion was stored without BHT and the others were treated with BHT at zero, 7, 14 and 21 days. The oxidative stability of coconut meal was measured […]

This experiment was carried out to evaluate the performance of broilers fed ration formulated based on digestible amino acids obtained with cecectomized roosters and broilers at different ages. A total of 300 Ag Ross 508 broiler chicks aging one to 21 days was distributed into 30 experimental units of ten broilers each (five birds of each sex) in six batteries of galvanized steel. All diets were based on corn, soybean meal and full-fat corn germ meal, considering the values of […]

This study aimed to estimate the energy requirements for maintenance and gain of Japanese and European quails under growth housed in two rearing systems: floor pens and cages. To determine maintenance requirements, two experiments were conducted with birds housed in cages in environmental chambers (experiment 1) and in floor pens at room temperature conditions (experiment 2). The experimental design was completely randomized with four levels of feed supply (100, 75, 50 and 25%) and four repetitions. Energy requirements for maintenance […]

Two independent experiments, one in pre-starter phase (1 to 7 days) and the other in the starter phase (8 to 21 days of age), were carried out with broilers to evaluate levels of calcium and available phosphorus (aP) in diets supplemented with 500 units of phytase activity/kg of diet. Each experiment consisted of a performance and a metabolic assay, and was conducted in a factorial schedule (3 × 4) + 1, with three aP levels (0.42, 0.37, 0.32% in the […]

A total of 70 five-month-old female New Zealand White rabbits were assigned in a completely randomized design, over three reproductive cycles, with two treatments: a reference diet and a half-simplified diet containing 79.83% cassava byproduct. The study evaluated body weight and feed intake of does, feed cost, number and total body weight of kits at kindling and weaning per female during three cycles, number and percentage of mortality/female/cycle, and weight gain of kits from birth to weaning. No interaction was […]

This experiment aimed to determine the metabolizable energy and the digestibility of detoxified castor meal and castor cake nutrients for broilers. A total of 180 Cobb-500TM broilers from 21 to 32 days of age was randomly distributed in three treatments with six replicates of 10 broilers – 5 males and 5 females. The experimental treatments were a reference-diet and two test-diets composed of 80% of reference-diet and 20% of detoxified castor cake or castor meal. The adaptation period ranged from […]