An experiment was carried out to evaluate the effect of diets with different protein levels and energy:protein ratio and amino acids on the performance and body composition of broilers (300 males and 300 females from 1 to 49 days of age), as well as the effect of these factors on the nutrients utilization efficiency. Three isoenergy experimental diets (D) were used (3000 and 3150kcal ME/kg for starter and growing phase, respectively) varying the levels of crude protein (CP) and the […]

Forty-seven bovines (average live weight of 266 kg), 16 zebu and 31 dairy crossbreeds (16 crossbreed Holstein x Gir and 15 Holstein x Guzera), were used to evaluate energy and protein requirements. Twelve animals (four of each racial group) were used as reference bovines, eleven were fed for maintenance and the 24 remaining were allotted to two treatments (zebu and dairy crossbreeds) in two phases (growing and fattening). Growing phase started when bovines reached 257 kg and lasted up to […]

To estimate nutrient and energy digestion with animal from in vitro variables it is necessary to control factors that may interfere on digestion such as: source and concentration of digestor substance, as well as the origin and processing of test ingredients. In this study there were performed five laboratory assays, two with poultry and finally regression equations were established based on variables generated with twelve vegetable ingredients. The results showed that there is greater solubility of proteins with NaOH than […]

The experiment was conduced to evaluate the effects of corn replacement for forage cactus on the performance of crossbreed lactating cows and nutrient digestibility. Eight cows were assigned a two latin square design in a factorial 2 x 2 arrangement (two forage cactus cultivars, with or without corn).There was not interaction between forage cactus and corn and the effect of both were analyzed in an isolated way. The intake of dry matter, organic matter, acid detergent fiber, crude protein, ether […]

An experiment was carried out to estimate dietary crude protein and energy requirements of 128 females of Japanese quails from 15 to 32 days of age, by the factorial method. A completely randomized design with four treatments with four replicates of eight birds was used. The treatments were: T1 = basal diet (BD) with 24.1% CP and 2,900 kcal AMEn ad libitum, T2 = 80%, T3 = 60% and T4 = 40% of T1 (close to maintenance). In the beginning […]

This experiment was carried out to estimate the crude protein and metabolizable energy requirements for maintenance and gain of 384 females of Japanese quails from 1 to 12 days of age. A completely randomized design with four treatments, with six replicates of ten birds each, was used. The treatments were: T1 = basal diet (BD) with 28% CP and 2,900 kcal AMEn ad libitum; T2 = 80%; T3 = 60% and T4 = 40% of ad libitum (close to maintenance). […]

To improve the pacu (Piaracatus mesopotamicus) feeding in the growth phase, it’s necessary to know the digestibility of the ingredients used in his diets. Initially, four fecal collection methods were analyzed (dissection, stripping, Guelph and modified Guelph), based on precision and versatility and also the most efficient time among fecal collection of the Guelph sedimentation systems, through crude protein digestibility coefficient of pacu basic diet. There was no difference among the fecal collection methods while the intervals of time among […]

In order to determine the apparent metabolizable energy (AME) and N-corrected apparent metabolizable energy (AMEn) of fresh and oxidized poultry fat a metabolism assay with 48 AgRoss male broilers from 31 to 34 days of age was conducted. The birds were fed a basal diet or this diet replaced by 10% of fresh or oxidized fat and the total excreta collection method was applied. The birds were housed in metabolic cages and each diet was supplied for four replicates of […]

The purpose of this study was to evaluate the effect of the inclusion of roasted whole soybean (RWS) in the concentrate composition to be employed to supplement feeding of Holstein cows on coastcross-1 pasture. Twelve early-lactating cows were utilized, divided into two groups as follows: A) the ones fed standard concentrate (control) containing soybean meal (23.5% CP and 80% TDN) and B) the ones fed RWS-enriched concentrate (19.5% CP and 86% TDN). In two treatments, daily feeding was of 9 […]

Six sheep were used to evaluate intake and total apparent digestibilities of dry matter (DM), organic matter (OM), crude protein (CP), ether extract (EE), total carbohydrates (CHO), neutral detergent fiber (NDF), non fibrous carboidratos (NFC), acid detergent fiber (ADF), cellulose (CEL), hemicellulose (HCEL) and energy of Arachis pintoi hay. Nitrogen balance was also determined. Animals were kept in metabolic cages and received A. pintoi hay plus mineral salt. The Arachis pintoi was harvested with approximately 100 days. The supply of […]