The effects of available phosphorus levels on performance and carcass composition of barrows with high genetic potential for meat deposition were evaluated. Sixty swine with initial body weight of 59.84 ± 1.64 kg were assigned to a randomized block experimental design, with five diets (0.097; 0.190; 0.280; 0.370 and 0.460% aP), six replicates and two animals per experimental unit. Experimental diets and water were supplied ad libitum until the end of the experimental period, when animals reached 96.64 ± 3.68 […]

The aim of the study was to evaluate the effects of supplements with three combinations of energy and protein on milk production, milk physical and chemical characteristics, body weight, body condition score and blood biochemical profile of the cows. It was used, in this experiment, 24 lactating cows on natural fields distributed in a complete random design, receiving one of the following supplements: low levels of energy and protein, low level of energy and high level of protein or high […]

The aim of this study was to evaluate the effect of the manner in which diet is supplied and spineless cactus forage is processed on intake, nutrient digestibility, milk production and composition, concentration of plasma urea nitrogen (PUN) in the milk urea nitrogen (MUN) and production of microbial protein in Holstein cows in lactation. Eight cows (453 ± 75.8 kg) yielding 14 kg milk/day were allotted to a factorial design, with two manners of cactus processing (knife-chopped or forage machine) […]

It was evaluated the biochemical serum profile of broilers fed rations supplemented with α-amylase produced by two microorganisms. Two extracts were produced, one was produced with a-amylase obtained from Cryptococcus flavus in a commercial yeast-based medium and the other with Aspergillus niger HM2003 produced in soybean protein and commercial starch medium with activity of 9.58 U/mL and 10.0 U/mL, respectively. A total of 360 Cobb 500 male 1-d broiler chicks with 49.72 ± 0.68 g of initial body weight were […]

With the objective of evaluating the quantitative characteristics of carcasses of equines, 72 undefined breed equines were classified by body weight, age and sex. It was determined cold carcass weight, cooling loss, carcass yield, front and back weight and muscle/bone ratio. The statistical model used was a completely randomized design in a 2 x 3 x 3 factorial scheme, with the two sexes, three age ranges and three ranges of body weights. The highest weight range corresponded to the highest […]

The objective of this work was to evaluate the genetic parameters estimated in intra and interespecific hybrid families of elephant grass under two evaluation strategies: per se and genetically stratified mass selection. Ten families of intraespecifc hybrids and ten families of interespecific hybrids were used. The characteristics evaluated were the following: plant height, plant agronomic score, dry matter content and dry matter production. It was estimated, for genetic parameters, heritability in the wide sense, variance, genetic and experimental variation coefficient […]

The aim of this work was to use association rules to identify forces that govern bull trade with genetic evaluation by Programa Nelore Brasil. Those rules permit to highlight patterns implicit in the transactions of large databases, which indicate determining causes and effects of supply and trade of bulls. In the analysis, it was considered 19,736 records of traded bulls, 17 farms and 15 attributes related to expected differences on the progenies of sires, place and time of sale. A […]

Different population sizes were simulated to estimate the phenotypic values in the selection assisted by markers for quantitative characteristics with heritability values of 0.10, 0.40 and 0.70. Cluster analysis with the phenotypic performance was carried out aiming at obtaining classification structure among the samples to optimize QTL detection. The genetic simulation system (Genesys) was used for the simulation of three genomes (each one consisting of a single characteristic whose distinction was the value of heritability), and the base and original […]

The aim of this study was to evaluate dry matter yield and nutritional value of palisade grass (Brachiaria brizantha cv. Marandu) using nitrogen doses and sprinkler irrigation in two periods of the year, aiming at reducing seasonality of forage production. It was used a randomized block design in a split-plot scheme, with five doses of nitrogen (0, 50, 100, 150, and 200 kg/ha/cut), and the sub-plots were defined by the seasons of the year (wet and dry season), with and […]

For performance evaluation of broiler chickens fed different levels of meal of tilapia industrial filleting waste (0, 2, 4, 6 and 8%), 480 chicks at 1 day of age were used in a completely randomized design with five experimental diets, six replicates and 16 birds per experimental unit. Weight gain, final weight, average feed intake, feed conversion and mortality from 1 to 21 days of age and from 1 to 42 days of age were evaluated and in the end […]