ABSTRACT The objective of this study was to evaluate whether replacing corn starch (CS) energy with isolated soy protein (ISP) and soybean oil (SO) and the ambient temperature affect the protein and energy requirements for maintenance and gain of European quail. Thus, a total of 432 European quail from 10 to 30 days of age, distributed in a completely randomized design, were used to estimate the protein and energy requirements for maintenance through the comparative slaughter methodology. The treatments consisted […]

The objective of this work was to evaluate average daily gain (ADG) and carcass traits in Nellore and Red Norte steers, finished in feedlots and to evaluate performance predictions by using the systems BR-CORTE, CNCPS 5.0 and NRC (2000). It was used 41 steers: 19 Nelore animals with initial body weight of 361 ± 31 kg and 22 Red Norte animals with initial body weight of 367 ± 30 kg. Adaptation period lasted 28 days. Animal performance evaluation was composed […]

The study was carried out to develop and to evaluate new equations to predict dry matter intake (DMI) of Nellore and Zebu-crosses cattle using meta-analysis procedure. The data used to estimate the parameters were collected from independent performance experiments using growing and fattening Nellore and Zebu-crosses cattle, and they were compiled from 561 experimental units. Before proposing an equation to predict DMI, it was observed that the genetic group was a source of statisticaly significant variation. Therefore, equations to predict […]

This work was carried out with the objective of studying the growth profile and the nutrients deposition on organs (heart, liver, gizzard, intestine and proventricle) of male and female broiler chickens from Ross and Cobb lineages. It was used 1,920 chicks at the age of one day placed in experimental shed boxes on the floor. The experimental design was completely randomized in a 2 × 2 factorial model composed of 2 sexes (mates and females) and two strains with 4 […]

Twenty-seven week-old commercial laying hens were allotted to a completely randomized design with a 3×3 factorial arrangement with three replicates of six birds per treatment. The factors consisted of hree methods for estimatingamino acid ingredient composition (Brazilian tables, prediction equations and factor for correcting amino acid in function of ingredient protein level) and three amino acid recommendations, being two for digestible amino acids and one for total amino acid. Methods for estimation amino acid ingredients composition had effect only on […]

Equations for predicting elephantgrass (Pennisetum purpureum, Schumack) dry matter intake (DMI) by Holstein x Zebu lactating dairy cows under grazing were developed by stepwise regression analysis. The dataset consisted of results of trials carried out at Embrapa Gado de Leite (Coronel Pacheco, MG, Brazil). The independent variables related to animal factors (days in milk; milk protein, fat and total solids contents and yields; live weight; live weight at calving; milk and fat-corrected milk yield; Holstein x Zebu gene fraction; order […]

The equations developed by Hankins and Howe were validated in order to predict the physical and chemical carcass composition and equations were developed aiming to estimate the body composition of zebu cattle from the 9-10-11th rib cut composition. Nineteen Zebu steers, with 270 kg of initial live weight (LW) and 2 years old were used. Four were slaughtered in the beginning of the trial, performing the reference group, three were fed to the maintenance level and the remaining were uniformly […]

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 objective of this work was to verify the usefullness of ultrasound to estimate the carcass backfat thickness (EGSC) at slaughter. Twenty four Brangus and 24 Nelore, intact males, were fed with diets containing 20, 40, 60 or 80% of concentrate. Ribeye area (AOLU) and backfat thickness (EGSU) between 12ª and 13ª ribs and the fat thickness over Biceps femoris muscle (EGPU) were collected with a PieMedical Scanner 200 Vet equipment, with linear array transducer of 178 mm coupled with […]

The study was carried out to develop predictions equations of the physical and chemical composition of dairy calves carcass. Eighteen Holstein bulls calves weighing between 30 and 100 kg were used. Groups of six animals were slaughtered at birth, 50 and 110 days of age. The carcass was divided in forequarter, rib, hindquarter and 9-11th rib section and dissection of each part was carried out. The physical and chemical composition was determined by a direct method and prediction equations were […]