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The objective was to evaluate the productive performance and the carcass traits of Nellore (NEL) and Rubia Gallega x Nellore F1 (NRG) heifers, subjected to energy-protein supplementation with chromium picolinate (CrP). Sixty heifers (30 NEL and 30 NRG) with a mean initial adjusted body weight (BW) of 214.50 kg and mean age of 201 days were distributed into a completely randomized design, in a 2 x 2 factorial (2 genetic groups x 2 supplementation groups). The experimental period lasted 320 days. There was no interaction (p>0.05) between the genetic groups and the supplements. The addition of CrP to the supplement did not alter the performance and carcass characteristics evaluated (p>0.05). However, the NRG genetic group was better than the NEL in the performance characteristics as final live weight, mean daily gain and carcass yield as carcass yield, Muscularity (p=0.05).The use of the Rubia Gallega genotype in crossbreeding provides an increase in production of heavier carcasses with lower fat percentages and higher yields when compared to the use of Nellore heifers. [ABSTRACT FROM AUTHOR]

The classification and typing can be used to group carcasses with similar characteristics, according to criteria of gender, maturity, weight, finishing and conformation to standardize the quality and meat yields. The aim of this study was to evaluate the effect of gender and maturity on the hot carcass weight, finishing and conformation in bovines slaughtered. During 4 days in January 2011, data of 2662 bovine carcass from slaughterhouse located in Sinop, Mato Grosso State, Brazil was analyzed to describe the characteristics of beef carcasses from this region. Females represented 60.86% of slaughters; castrated and non-castrated were 19.91$ and 19.23%, respectively. Analyzing the data observed high maturity of slaughtered animals, independent of gender. Oldest animals presented increase of average carcass weight, as well as the deposition of fat in the carcass, the exception were non-castrated male that not showed a direct relationship between maturity and finishing. Results of non-castrated males and females had difference (P<0.05) in conformation according to the maturity. Therefore, data showed that regardless of gender, the animals had increase of weight, conformation and finishing proportional to the increasing maturity. [ABSTRACT FROM AUTHOR]

The objective was to evaluate the performance through weight gain, carcass yield and yield forecasting of cuts of meat from Nellore steers and F1 Brangus × Nellore, supplemented with mineral mixture with addition of chromium chelate, submitted to a grazing system in Pantanal Matogrssense . 160 animals (80 Nellore steers and 80 F1 Brangus × Nellore steers) were used, they were 210 day-old and they were divided into four treatments: T1 (40 Nellore steers with chromium chelate), T2 (40 Nellore steers without chromium chelate), T3 (40 F1 Brangus × Nellore steers with chromium chelate) and T4 (40 F1 Brangus x Nellore steers without chromium chelate). The experimental design was completely randomized, in factorial design. The following variables were measured: hot carcass weight (HCW); carcass yield (CY), calculated in relation to fasting weight; rib eye area (REA) and subcutaneous fat thickness at the back (SFTB) by ultrasound. These data along with the hot carcass weight (HCW) were used to calculate the equations of carcass yield, Brazilian commercial cuts (CCB) and total usable meat (CAT). The results have shown that Nellore supplied with chromium chelate had significantly higher hot carcass weight (p <0.05)if compared to control animals, 241.42 kg and 228.73 kg respectively. There has been no significant difference (p> 0.05) among Nelore animals, the Brangus × Nelore group, and the animals with mineral supplementation associated with chromium chelate when compared to control animals. As for the retailers index, the values obtained by Nellore cattle with chromium chelate and control group are 55.34% and 52.56%, respectively, and as for F1 Brangus × Nellore animals with chromium chelate and control group, the results are56.83%, and 49.51%, respectively. A significant difference (p <0.05)was observed only for the animals supplemented with chromium chelate in both genetic groups. Concerning CAT and CCB, no significant differences (p> 0.05) between breeds and treatments were observed. [ABSTRACT FROM AUTHOR]