This study was conducted to evaluate the effect of reduction of the available phosphorus (avP) in diets supplemented with 500 FTU/kg phytase on performance, carcass characteristics, and bone mineralization of broilers aged 22 to 42 days kept in a high-temperature environment. A total of 336 Cobb broilers with an average initial weight of 0.883±0.005 kg were distributed in a completely randomized design with six treatments – a positive control (0.354 and 0.309% avP without addition of bacterial phytase for the […]

This research was conducted to evaluate the net energy and ractopamine levels in the diet of finishing gilts kept under thermal comfort conditions. Forty gilts were used, with initial weight of 67.4 ± 3.4 kg, distributed in a randomized blocks design in a 2 × 4 factorial scheme composed of two levels of ractopamine, 0 and 20 ppm, combined with net energy levels of 2,300; 2,424; 2,548 and 2,668 kcal/kg of feed, with five replications, considering each animal per experimental […]

The objective of this study was to evaluate performance, quantitative characteristics of carcass, and visceral responses of barrows maintained on heat stress enviroment and fed diets supplemented with ractopamine. It was used 48 animals with initial weight of 67.3 ± 3.8 kg, distributed in a randomized block design with four levels of ractopamine (0, 5, 10 and 20 mg/kg), each one with six replicates with two animals each. The experimental period lasted 28 days. Air temperature was 31.8 ± 2.0ºC, […]

This study was performed to evaluate the effects of reduction of dietary crude protein level with supplementation of industrial amino acids on the performance and carcass yield of broilers between 22 to 42 days of age, under heat stress. It was used 280 Cobb broilers with initial weight of 856 ± 7.41 g, distributed in a complete randomized experimental design, with five crude protein levels (21.6; 20.6; 19.6; 18.6 and 17.6%), eight repetitions and seven broilers per experimental unit. The […]

This study was aimed to evaluate the effects of the dietary digestible lysine levels and environmental temperature on performance and carcass characteristics of broiler chickens from 22 to 42 days-old. Six hundred seventy two males Ross® broiler chickens with an average weight of 726 g were allotted to a completely randomized design, in a 4 × 4 factorial arrangement with six replicates and seven birds per experimental unit. The chickens were fed with different digestible lysine levels in the diet […]

The experiment was carried out to determine the requirement of methionine + cystine (met + cys) for broilers from 22-to-42-day-old kept under thermoneutral environment (23.5°C). A total of 240 Avian Farm male broilers, with 827 g average initial weight were distributed in a randomized experimental design with five levels of met + cys (0.659, 0.704, 0.750, 0.796, and 0.841%), six replications and eight birds per experimental unit. The increase of met + cys level influenced positively feed: gain ratio, met […]

This study was carried out to evaluate the effect of environmental temperature on performance, carcass composition and physiological parameters of pigs from 30 to 60 kg of weight. Thirty six barrow (Landrace x Large White) with initial weight of 29.94 ± 0.49 kg, were assigned to a completely randomized experimental design with three treatments six replicates and two animals per experimental unity. The experimental period lasted 35 days. The treatments consisted of T1 Animals on heat stress (32ºC) fed ad […]

The experiment was conducted to determine the effect of dietary methionine + cystine (met + cys) requirement of 1-to-21-day-old broiler chicks on thermoneutral environment. Four hundred Avian Farm male broiler chicks were assigned to a randomized experimental design with five treatments (0.756, 0.810, 0.866, 0.920, and 0.976% of met + cys), eight replicates of ten birds. Weight gain (WG), feed:gain ratio, met + cys intake, protein deposition of absolute weights of liver, gizzard, and lung and relative weights of lung […]

An experiment was conduced to determine the crude protein (CP) level in diets with amino acids supplementation for gilts maintained in a thermal comfort environment. Fifty crossbreed crossbred gilts (Landrace x Large White) with initial average weight of 30.1 kg were allotted to a completely randomized experimental design, with five treatments (19, 18, 17, 16 and 15% of CP with supplementation of lysine, methionine, tryptophan, threonine and valine to maintain the same protein quality) five replicates and two animals per […]

Two hundred and forty male broilers, Avian Farms with average weight of 541 ± 3.61 g from 22 to 42 days of age, kept under environment of high temperature were used to determining the lysine requirement. A completely randomized design, with five treatments (0.88, 0.94, 1.00, 1.06, and 1.12% of total lysine level), six replicates and eight broilers per replicate, was used. During the experimental period, the air temperature was maintained in 25.6 ± 0.24ºC, the relative humidity in 68.4 […]