The effects of digestible threonine levels, based on ideal protein concept in diets with 1.35% of digestible lysine on Nile tilapia (Oreochromis niloticus) fingerlings performance. Four hundred thirty two reverted Nile tilapia, Thailand strain, with initial weight of 1.64 ± 0.03 g, were allotted to completely randomized design, with six diets and six replications with twelve fishes each. The five diets, isoenergetic isoproteic, consisted of various threonine:digestible lysine ratio (69.0, 74.0, 79.0, 84.0, and 89.0%) and methionine + cystine:digestible lysine […]

Necropsy and histological examination were made on bullfrog (Rana catesbeiana) tadpoles fed commercial rations with 32, 36, 45 or 55% crude protein (CP) to establish the relationship between dietary crude protein and health of the animal. In the necropsy, the tadpoles did not show externally any changes, however, the liver of animals at all crude protein levels, presented a straw color and stained. Histological analysis showed livers with rarefaction and degeneration of cell protein, intestines, with colitis and flattening of […]

The development of midgut, liver and pancreas bullfrog tadpoles (Rana catesbeiana) fed commercial diets with 22, 24 or 28% of crude protein (CP) was evaluated. A total of 360 tadpoles, 15 days old, from the same spawning, was allotted to 30 L-boxes, using a density of 1 tadpole/L, kept at 25 °C (±1°C). A completely randomized experimental design with four replications was used. Three tadpoles of each group were collected from 9th to 48th day of feeding, and organs (midgut, […]

The aim of this study was to evaluate the effect of increasing the concentration of protein of the seminal plasma in the extender used for frozing equine semen. Three treatments were compared: The conventional one, defined by using only the Botu-Crio® extender for frozing semen; and other two defined by adding 10% (v/v) or 20% (v/v) of seminal plasma proteins to Botu-Crio® extender. Averages of total and progressive motility were statistically higher in the conventional treatment than in that defined […]

This study aimed to evaluate the minimum number and interval of weightings to estimate the asymptotic weight (A) and maturing rate (k) parameters of the growth curve of cattle. Parameters A and k of the Richards non-linear model and two data sets of weights of cattle from 1 to 3,601 days were simulated. The first data set consisted of 13 to 121 weights obtained every 30 days and the second one consisted of weightings at intervals of 30 to 150 […]

Iron bioavailability from different compounds was evaluated to be used in diets for weaned piglets. Forty four piglets (7 non-anemic and 37 anemic) weaned at 21 days old (7.3 ± 1.8 kg) were distributed into two groups: non-anemic group and anemic group. During seven days, the animals from non-anemic group were fed diet with ferrous sulfate hepthydrate (FeSO4.7H2O) in the dose of 100 mg/kg and of the anemic group, diet without iron (<15 mg/kg diet). On the seventh day, after […]

The objective was to estimate the nutritional requirements of digestible lysine for Japanese laying quails. Two hundred and forty Japanese quails were allotted to a completely randomized block designs, with five diets, with six replications of eight birds each. Diets consisted of a basal ration deficient in lysine and supplemented with five levels 0.88, 0.96, 1.04, 1.12 or 1.20%) of digestible lysine. Feed consumption, egg production, egg weight and egg mass, feed conversion by egg mass (FCEM) and by dozen […]

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, […]

Two experiments were carried out to evaluate the effect of five digestible threonine:lysine ratios (TL) on the nitrogen balance of growing pigs and five levels of net energy (NE) on growing-finishing pigs performance. In the first experiment, 15 high-lean commercial crossbred barrows, with initial weight of 37.0 ± 2.6 kg, were allotted to a completely randomized design, with five diets (digestible threonine:lysine ratio of 0.574, 0.624, 0.673, 0.722, and 0.772, in low protein diets, 14.7%) and three replications. Absorbed crude […]

Two experiments were carried out to evaluate available phosphorus (aP) × phytase interaction of the diet on performance, phosphorus plasma levels and bone parameters of laying hens. In experiment 1, 240 birds with 40 weeks old, were distributed in a 5 × 2 factorial arrangement, composed of five levels of available phosphorus (0.094; 0.194; 0.294, 0.394 and 0.494%) and two of phytase levels (0 and 300 Phytase Units – PU). In experiment 2, 288 birds with 44 weeks old were […]