Arlei Rodrigues Bonet de Quadros

Características de carcaça e da carne de novilhos de diferentes genótipos de Hereford x Nelore

The objective of this experiment was to evaluate the carcass and meat characteristics of Hereford (H), 5/8 H 3/8 Nellore (N), 1/2 H 1/2 N and 1/4 H 3/4 N steers, feedlot finished, from 20 to 24 months of age. Twenty-four steers randomly taken from the same herd were used. The diet contained, in a dry matter basis, 12.7% of crude protein and 57.5:42.5% forage:concentrate ratio. The forage was composed by corn silage + sugar cane (relation 1:1). The slaughter and cold carcass weights were higher for 1/2 H 1/2 N steers (443 and 236 kg) followed by 5/8 H 3/8 N (426 and 225 kg). The cold carcass dressing percentage increased as the proportion of N increased, being 48.91, 52.74, 53.37 and 54.23%, respectively. There was no difference for subcutaneous fat thickness, bone, muscle and fat percentage in the carcass. The meat tenderness decreased with the increase of Nellore proportion in the genotype.

DIETAS SIMPLES E COMPLEXA SOBRE O DESEMPENHO DE LEITÕES NA FASE DE CRECHE

The objective of this work was to evaluate diets fed from 21 to 63 days of age on piglets performance. Ninety-six piglets three crossbrad were fed with two types of diets: simple and complex. A completely randomized design with two treatments and twelwe replicates per treatment was used. The daily feed intake (DFI), the daily weight gain (DWG), the feed:gain ratio (F:G) and the weights were evaluated in the period. The piglets fed with complex diets had higher DFI and DWG in the post lactation. In the period (nursery phase), there was no diet type effect on weight and the F:G.

Inclusão de diferentes níveis de casca de soja moída em dietas isoenergéticas para suínos em crescimento e terminação

O experimento foi conduzido com o objetivo de verificar o efeito da inclusao de diferentes niveis de casca (CS) de soja em dietas isoenergeticas para suinos em crescimento e terminacao. Quarenta suinos hibridos, machos castrados e femeas, com peso inicial de 27,8 ± 2,1kg, foram bloqueados por peso e distribuidos ao acaso em cinco tratamentos, com quatro repeticoes de dois animais/baia (unidade experimental). Os tratamentos consistiram da inclusao de 0; 4; 8; 12 e 16% de CS moida (2,5mm) em dietas isoenergeticas (16,4 e 15,0% PB e 3.385 e 3.390kcal ED kg-1) para as fases de crescimento e terminacao, respectivamente. Nenhuma variavel de desempenho foi influenciada pela inclusao de CS nas dietas. Os niveis crescentes de CS promoveram reducao linear da espessura de toucinho (ET), do rendimento de carcaca quente (RCQ) e do rendimento de carcaca fria (RCF) e aumento da quebra por resfriamento (QR). Para as variaveis peso de carcaca quente (PCQ) e peso de carcaca fria (PCF), foram observados efeitos quadraticos, sendo os menores valores observados com 8,0% de inclusao de CS. O aumento do nivel de CS na dieta elevou a QR, que piorou o rendimento de carcaca e diminuiu a ET. Nao houve diferenca para comprimento de carcaca, peso de pernil, area de olho de lombo e relacao carne: gordura. Os resultados sugerem que a inclusao de ate 16% de CS nas dietas dos suinos em crescimento/terminacao nao altera seu desempenho e pode produzir carcacas mais magras.

Effects of different grinding levels (particle size) of soybean hull on starting pigs performance and digestibility

Two experiments were carried out to study the effects of grinding of soybean hulls (SH) on starting pigs (15-30 kg) diets. Experiment I consisted of a digestibility trial with 12 barrows, initial average body weight 21.9±1.29 kg, in which the best digestibility coefficient (DC) of DM and GE was obtained with SH ground through a 2.5mm screen mesh, evaluated for CP and ME, a best DC was attained with 3.0 mm screen mesh. In the Experiment II, five diets with increasing SH (2.5 mm) levels (0, 3, 6, 9 and 12 %) for starting piglets were formulated. A quadratic response in daily weight gain (DWG) occurred, according to SH inclusion. Worst DWG occurred at 7.75 % SH inclusion. Daily feed intake, feed: gain ratio and plasma urea nitrogen were not affected by inclusion levels. In conclusion, although soybean hull grinding improves the digestible nutrients, inclusion of SH on starting pig diets is economically unfeasible.

Níveis de aminoácidos na dieta de suínos machos inteiros dos 25 aos 70KG

In Brazil, the slaughter of boar is prohibited, however this category presents economic advantages when compared with the barrows. Some experiments have demonstrated that differences exist in the nutritional requirement among these categories. The present experiment was carried out at the Federal Universty of Santa Maria, where 96 animals were evaluated concerning performance when fed with diets containig 100, 90, 80 and 70% of the maximum levels recommended for lysine, threonine, methionine + cystine and tryptophan (1.25, 0.81, 0.75 and 0.22%, respectively) until they reached an average weight of 70kg. No significant differences (P > 0.05) were observed for food intake, daily gain and feed conversion efficiency during the whole period, being the levels of 0.87% lysine, 0.57% threonine, 0.52% methonime + cystine and 0.16% tryptophan enough to provide good performance, and showed to be more economic between tested levels.