The objective of this research was to evaluate the performance, carcass yield and intestinal morphometry of broiler chickens raised under different temperatures that received feed with or without yeast extract and prebiotic in the pre-initial phase. One thousand four hundred and forty one-day old male chicks were used, raised in different climate chambers. Feed with or without the addition of yeast extract and prebiotic was offered only in the pre-initial phase (1 to 7 days). From the eighth day on, […]

The objective of the study was to determine whether bioavailability of methionine hydroxy analogue free acid (MHA-FA) is higher than 65%, in product basis, for 24 to 40 week-old laying hens. Six hundred and forty 24-week commercial laying hens were used in four 28-day experimental periods in a randomized complete design with ten treatments, eight replications and eight birds per experimental unit. The treatments were based on a basal feed deficient in methionine, containing 2,830 kcal metabolizable energy (EM)/kg and […]

The performance of broilers reared at different temperatures and fed diet with or without yeast extract and/or prebiotic in the starter phase was evaluated. One thousand, four hundred and forty 1-d male Cobb-500® were reared at different climatic chambers. The diets with or without yeast extract or prebiotic were fed only in the starter phase (1 to 7 days), and from the 8th day on all broiler were fed the same commercial diet. It was used a complete randomized experimental […]

The sheep behavior over 24 hours in Tanzania grass irrigated pastures under four supplementation levels (0.0; 0.6; 1.2 and 1.8% LW) was evaluated in this work. A complete randomized design with six replicates (sheep) was used. The percentage of total time under shade, grazing, ruminating, in “other activities”, in idleness, the number of supplement/salt ingestions, defecations, urinations, water ingestion and bite rate were estimated, splitting the day in eight periods of three hours (from 5 to 8 a.m.; 8 to […]

The objective was to evaluate diets with different levels of CP and fat, and their effect on feathering and hematological and biochemical parameters of broilers submitted to cyclic heat stress (HS) since 21 d of age or in thermoneutral environment (TN). A factorial 2 x 2 + 2 was used, with two environments-TN (21-25ºC and RH 73%) and HS (25-32ºC and RH 65%), and two diets (D) – control (2.4% fat and 19.5%CP) and summer (SD) (4.0% fat and 18.5% […]

Fifty and two lactating sows were allotted to a randomized complete blocks experimental design with four digestible threonine levels (0.64; 0.67; 0.70 and 0.73%) and 13 replications, and each experimental unit was consisted by a female. The temperature inside in the room was of 29.7 ± 2.5°C. There was no effect of digestible threonine levels in the diet on the weight of the sows at weaning. The total and percentage sow weight losses linearly reduced with the increase of digestible […]

An experiment was conduced to evaluate crude protein (CP) levels and amino acid supplementation for gilts from 30 to 60 kg maintained in a high environmental temperature (air temperature of 30ºC; relative humidity of 66.1% and BGHI of 79.7). Fifty crossbreed gilts (Landrace X Large White) with an average initial weight of 30.2 kg were allotted to a randomized experimental design with five treatments and five replications and two animals per experimental unity. The treatment consisted of five levels o […]

Sixty swine (Landrace x Large White) with initial weight of 14.97 ± 0.33 kg and 50.36 ± 3.29 days old were allotted to a blocks randomized experimental design, with five treatments (0.465, 0.511, 0.558, 0.605, and 0.652% digestible methionine + and cystine)and six replicates of two animals, to determine the sulphurous amino acids requirements for barrows on a high temperature environment from 15 to 30 kg. Diets and water were fed ad libitum until the end of the experimental period, […]

Fifty barrows (30.10 ± 0.48 kg to 60.08 ± 0.49 kg live weight were assigned to a completely randomized blocks design, with five digestible methionine plus cystine levels (0.448, 0.490, 0.531, 0.573, and 0.615%), five replicates and two animals per experimental unit, to evaluate the requirement of digestible methionine plus cystine The digestible methionine and cystine levels of the diet influenced the average daily gain that increased in a linear way. However, the linear response plateau model was what best […]

A study was conducted to determine the effect of environmental stress on physiological criteria of feedlot sheep. Treatments consisted of two different housing conditions (shade and no shade) and two levels of concentrate in the diet: high concentrate (70% of concentrate and 30% of roughage-70C:30R); low concentrate (30% of concentrate and 70% of roughage-30C:70R). Animals raised under shade and fed a high concentrate diet (70C:30R) had greater dry mater intake (1258 g/animal/day) and crude protein (0.8% of body weight (BW) […]