The objective of this study was to evaluate the total methionine+cystine requirements in function of crushed and ground diets and pullet strain (light and semi-heavy) from 1 to 4 weeks of age. One thousand and sixty 1-day-old pullets were used as follows: 800 Dekalb White pullets and 800 Bovans Goldline pullets, weighting 34.52 ± 0.26 g and 36.41 ± 0.22 g, respectively. The experimental design was completely randomized in a 5 × 2 × 2 factorial scheme (0.65; 0.70; 0.75; […]

This study was conducted using 103 male and female lambs from the following genetic groups: Santa Inês (SS) purebred and Santa Inês × Texel (TS), Santa Inês × Ile de France (FS), and Santa Inês × Bergamacia (BS) crossbred. The animals were slaughtered at the following body weights: 15, 25, 35 or 45 kg. After slaughter and cooling of the carcasses, the following cuts were made: neck, rib/flank, short ribs, loin, blade, and hind limb. The composition in muscle, bone […]

Twenty-six Moxotó non-castrated male kids (averaging 15 kg of initial live weight (LW) and 6-8 months old) fed a diet with 2.6 Mcal of metabolizable energy were used to predict the net energy requirements for maintenance and net efficiency of metabolizable energy utilization (EMEU) for maintenance (km) and weight gain (kf). At the beginning of the experiment, six animals were slaughtered as reference to estimate initial body composition and initial empty body weight (EBW). Afterwards, five groups of four animals […]

Using biotechnology to increase the growth rates of fish is likely to reduce production costs per unit of food. Among vertebrates, fish appear to occupy a unique position, when growth patterns are considered. With few exceptions, fish species tend to grow indeterminately, implying that size is never fixed. Both hyperplasia and hypertrophy contribute to post-larval muscle growth in fish. Growth hormone (GH) – Insulin-like Growth Factor I (IGF-I) is the most important growth axis in fish. Our experimental model, the […]

Providing feed is a major input cost in beef production, hence improvements in the efficiency of feed utilisation will reduce the cost of production. Residual feed intake (RFI) is a measure of feed efficiency, and is defined as the difference between an animal’s actual feed intake and its expected feed intake based on its size and growth. It is independent of the level of production, and the lower the value the more efficient the animal is. This paper examines the […]

The objective of this work was to evaluate the effects of sex class and concentrate allowance level on performance and digestibility of the nutrients in Nellore cattle. Thirty five animals were used, 12 young bulls, 11 steers and 12 heifers, from the same contemporary group, were randomly allotted into two treatments: concentrate allowance levels of 0.6 and 1.2% BW, respectively. The animals were individually fed during 112 days, and slaughtered at the end of the trial with a reference group […]

Thirty-five male kids Boer × Saanen kids were shaughtered at 5, 10, 15, 20 e 25 kg BW to evaluate the carcass traits and commercial cuts and tissues allometry. The diet fed to the animas was composed by cow milk in the first 49 days and ad libitum ration from the seventh day until slaughter. The cuts were obtained after cooling of the carcass and the leg dissected in muscle, bone and fat. The body weight showed a negative linear […]

With the objective of determine the nutritional requirement of lysine for growing white-egg and brown-egg laying hens in the period from 1 to 3 and 4 to 6 weeks of age, 480 birds were used in the period from 1 to 3 weeks of age and 432 birds in the period from 4 to 6 weeks of age. In both periods, Hy-line birds were used; 50% Hy-line W 36 (White) and 50% Hy-line Brown in completely randomized design in a […]

This research was carried out to compare the effect of phytase on performance, in the incorporation and excretion phosphorus in Nile tilápia. Four diets were used: one standard (contol), composed by 3,200 DE kcal ED/kg of ration and 30.0% CP and supplemented with phosphorus (4.0% of dicalcium phosphate), considering the treatment control, and others three, without phosphorus supplementation, with different phytase levels (1,000, 1,500, and 2,000 uf/kg), with four replication, per a period of 82 days. Circular tanks of fiber […]

The objective was to evaluate the replacement corn silage by coffee hulls in the diet on performance, total apparent digestibility of dairy heifers. Twenty-four dairy Holstein heifers, purebred and crossbred, were assigned, according to animal initial weight, to a randomized block design with four treatments (Coffee hulls levels: 0.0, 7.0, 14.0, and 21.0% DM basis) and six replicates. All heifers were daily fed 2.0 kg concentrate. DM intake linearly increased, while fresh matter (FM) intake was not affected by the […]