ABSTRACT The objective of this study was to evaluate performance, apparent digestibility, blood parameters, and quantitative characteristics of carcass and internal organs of crossbred dairy calves fed different levels of crude glycerin in corn grain-based diets. Twenty-four calves of three months of age and average initial weight of 95.5±11.8 kg were used. The experimental design was completely randomized with four treatments (0, 80, 160, and 240 g kg−1 of crude glycerin of DM of diets). The calves were fed in […]

The objective of this study was to evaluate the characteristics of external components and discard fat of young steers with two different sexual conditions and two different genotypes, finished in feedlot. Average age and weight of the animals at the beginning of the experimental period were 12 months and 267.0 kg, respectively. The steers were in feedlot until reaching pre-established slaughter weight of 400 kg. Diet contained roughage:concentrate ratio of 50:50, on dry matter basis, with 10% crude protein. It […]

Thirteen male Holstein calves with average age of 14 days were used. Three animals were slaughtered at the beginning of the experiment (reference) and ten others were randomly distributed in two treatments (ground or pelleted feed), and slaughtered at 112 days of age to determine the nutritional requirements. Regression equations of the logarithm of the amount of protein, fat and energy in the body were fitted as a function of the empty of body weight (EBW). The net protein and […]

The objective of this trial was to evaluate the non-integrant body components of the carcass from young bulls slaughtered at 14-16 months of age, fed different concentrate levels in the diet. The animals were feedlot finished until reaching 400 kg of body weight. Sixteen bulls were randomly distributed into four treatments: 22; 40; 59 or 79% concentrate in the diet. The initial average age and weight were 9.3 months and 192.4 kg, respectively. The empty body weight (EBW) and carcass […]

The effect of heterosis and genetic group on the distribution of internal and trim fat and, external components of the body of purebred, Charolais (C) and Nellore (N), and crossbred steers from second (G2) (¾C ¼N and ¾N ¼C), third (G3) (5/8C 3/8N and 5/8N 3/8C) and fourth (G4) (11/16C 5/16N and 11/16N 5/16C) generations of feedlot finished rotational crossbreeding were evaluated. Steers from G2 showed higher absolute weight for renal, intestinal and total fat when compared to purebreds’ average, […]

Twenty-six Moxotó non-castrated males kids, with average 15 kg BW and 7 to 8 mo old, were fed a diet containing 2.6 Mcal/kg ME were used to evaluate the body composition and energy requirements for weight gain. At the beginning of the experiment, six animals were slaughtered as a reference to estimate initial body composition and initial empty body weight (EBW). While, the remaining animals (four groups of five animals, one for each feeding regime, were distributed to a completely […]

Twenty-six Moxotó non-castrated male kids (initial mean 15 kg LW and 7-8 month old) fed a diet with 2.6 Mcal ME were used to evaluate the body composition and protein requirements for weight gain. At the beginning of the experiment, six animals were slaughtered as reference to estimate initial body composition and initial empty body weight (EBW). Subsequently, homogeneous groups of four animals were distributed a complete randomized experimental design into two feeding regimes: ad libitum feeding (AL) and feed […]

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 […]

The objective of this trial was to investigate the effect of heterosis and genetic group on the yield and weight of internal organs and gastrointestinal tract (GIT) of feedlot purebred (Charolais C and Nellore N) and crossbred steers from second (G2) (¾C ¼N and ¾N ¼C), third (G3) (5/8C 3/8N and 5/8N 3/8C) and fourth (G4) (11/16C 5/16N and 11/16N 5/16C) generations of rotational crossbreeding slaughtered at 23 month of age. Crossbred steers from G2, G3 and G4 had, respectively, […]

The objective of this trial was to evaluate the components of non integrate body components of carcass of two categories, steers (slaughtered at 22.8 months old) and young steers (slaughtered at 15.2 months old), from two genetic groups, 5/8 Charolais (CH) 3/8 Nellore (NE) and 5/8NE 3/8CH, and to evaluate the relationship among the variables studied. The animals were fedlot finished until reaching 430 kg. The diet, roughage:concentrate ratio of 60:40 (dry matter basis), contained 10.25% crude protein and 3.18 […]