The objective of this experiment was to evaluate the different levels of manganese and phosphorus (P) on the performance and eggshell quality and on determined blood constituents of 96 laying hens Hy-Line W36, with 60 weeks of age, distributed in 24 lots with four hens each. A completely randomized experimental design was used in a factorial arrangement (3 x 2), manganese levels (70, 140 and 210 ppm) and total phosphorus levels (.35 and .55%), totalizing six treatments with four replicates […]

The objective of this experiment was to determine the digestible lysine requirement for male broilers from 1 to 21 days. Six hundred male broiler chicks, Hubbard, with an average weight of 48 g were allotted to randomized blocks experimental design with five treatments, six replicates and 20 chicks per experimental unit. The treatments corresponded to the basal diet, with 20.85% of crude protein and 3000 kcal of ME/kg, attending the requirements of protein, energy, calcium, phosphorus and amino acids, except […]

The objective of this experiment was to study the effects of population density on the productive performance of growing rabbits. One hundred and eight New Zealand White rabbits of both sexes, weaned at the 28 days of age and housed at the 35 days of age for an experimental period of 6 weeks, in galvanized wire cages with the dimensions of .6 x .6 x .375 m, equipped with automatic feeder and drinking nipple installed in partially shut housing. The […]

This work was conducted aiming to evaluate the effect of dietary energy level and the previous heat exposure on the respiratory activity of the mitochondria from the cardiac muscle of broiler chickens. It was used broiler chickens (Hubbard) from both sexes and fed with diet containing 2900 kcal ME/kg or 3200 kcal ME/kg. The birds were heat stressed (35oC/4h) in the 1st, 21st and 42nd days of age. The respiratory activity of mitochondria from cardiac muscle was evaluated in a […]

This experiment was carried out to determine the threonine requirement for broilers chicks from 1 to 21 days of age and to evaluate the effect of different threonine levels on the uric acid excretion in broilers. One thousand and two hundred broiler chicks were randomly allotted to a 6×2 factorial arrangement, being six levels of total threonine (.73, .77, .81, .85, .89, and .93%) and two sexes, with five replicates of 20 birds each. Feed intake, weight gain, feed:gain ratio […]

The objective of this work was to evaluate two levels of calcium (.7 and 1.4%) in the diet of chicken Rhea (Rhea americana). Twelve chicken Rhea with 30 days of age were allotted in pare, in six plots with 100 m2, in a completely randomized experiment design with three replications. The feed intake was daily evaluated and the weight and the growth characteristics (length of beak, tibiotarsus and metatarsus measurements) were weekly evaluated, during 60 days. The chicken Rhea maintained […]