This experiment was carried out to evaluate the effects of levels of methionine and lysine on performance and on the internal and external egg quality of commercial laying hens. It was used 256 Hisex White laying hens at 68 weeks of age, which were individually housed in a complete random design in a 4 õ 4 factorial scheme with four levels of lysine (0.482, 0.682, 0.882, and 1.082%) and of methionine (0.225, 0.318, 0.411, and 0.505%) totaling sixteen diets with […]

Aiming at determining levels of digestible sulfurous amino acids to establish the ideal methionine + cystine/lysine relationship in rations for light-weight laying hens in the period from 42 to 58 weeks of age, 216 birds of the commercial brand Hy- Line W36 were distributed in a randomized block design with 6 diets, 6 repetitions and 6 birds per experimental unit. The level of digestible lysine used in the experimental diet was 0.770% for an expected average consumption of 731 mg/hen/day […]

Scientific knowledge about companion animal nutrition has increased incrementally, following the phenomenon seen in several areas of knowledge. In the last decade may be the priority of research was directed to the use of nutrients in health promotion, prevention of degenerative diseases, improve quality of life and increased life expectancy of dogs and cats. This direction of research is largely explained by the importance that dogs and cats taken in people’s lives, making that the decisions of the owners about […]

The objective of this work was to determine digestible sulfurous amino acids levels to establish the ideal methionine+cystine:lysine relationships in meals of light-weight laying hens in the period from 24 to 40 weeks of age. It was used 216 Hy-Line W36 birds distributed in a randomized block design with 6 levels each one with 6 repetitions and 6 birds per experimental unit. The digestible sulfurous amino acids levels were obtained from a basal diet with low levels of digestible metionin+cistine […]

The experiment was carried out to evaluate the effects of diets with different levels of crude protein (CP) and lysine (LYS) on characteristics of performance, egg internal quality, and nitrogen balance/retention. It was used 160 Hisex White laying hens at 48 weeks of age, individually accomodated in a complete random design in a 4 × 2 factorial scheme with four levels of crude protein (12, 14, 16 and 18%) and two levels of lysine (0.85 and 1.00%), totalizing eight treatments […]

The objective of this research was to evaluate the dry matter intake (DMI) and nutrient consumption in Nellore and Red Norte steer finished in a feedlot and compare the actual and predicted values by NRC (2000), CNCPS 5.0 and BR-CORTE systems. Forty-one animals, 19 Nellore and 22 Red Norte steers, with initial live weight of 361 ± 31 kg and 367 ± 30 kg, respectively, were used. The experiment lasted 84 days, with 28 days for adaptation and 56 experimental […]

The objective of this study wast to determine the requirement of digestible lysine for light-weight laying hens 24 to 40 weeks of age. Two hundred and sixteen Hy-Line W36 light-weight laying hens were allotted to a randomized complete blocks with six treatments, six blocks and six hens per experimental unit. The treatments consisted of a basal diet, with 14.54% crude protein, deficient in digestible lysine (0.545%), supplemented with six levels of L-lysine HCl (78%) 0.00; 0.059; 0.118; 0.177; 0.237 and […]

Minerals, including trace-elements, and vitamins are currently introduced into the pig diet in order to obtain suitable performances for the modern pig genotype bred in confinement. Most of the mineral and vitamin contents of cereals and usual protein compounds are characterized by their poor and variable availability. Supplemental diets are then usually needed. This paper, based on literature data, reviews the pig requirement for minerals and vitamins in order to ensure economic and profitable performance. Recent research has focused on […]

The body composition and net protein and energy requirements for weight gain of 5/8 Hostein-Zebu crossbred cattle raised in Brachiaria decumbens Spaft pasture were evaluated. In total, 16 bulls with 10 months of age and body weight (BW) of 180 ± 19.95 kg were used. The animals were kept with free access to pasture or with restricted grazing (from 6 to 10 h). Four animals were slaughtered at the beginning of the experimental period to estimate the empty body weight […]

Sixty pluriparous sows (average of four farrowing) from commercial line, with initial weight of 262.7 ± 22.50 kg, were used to evaluate the effect of digestible threonine levels on productive and reproductive performance during 16.02 ± 1.17 days of lactation. The animals were distributed to a completely randomized design, with 4 diets and 15 replications, considering the sow the experimental unit. The diets were formulated with four levels of digestible threonine (0.608, 0.646, 0.684 or 0.722%), the corresponding to 64, […]