ABSTRACT. The objective of this work was to evaluate the non-carcass components of crossbred Santa Inês lambs finished in feedlot with the inclusion of different levels of red propolis extract (RPE). Thirty-five crossbred lambs were used with an average weight of 17.08 ± 2.36 kg and mean age of five months, distributed in a completely randomized design with five treatments and seven replications. The treatments evaluated were: 0; 7; 14 and 21 mL of extract/animal/day Before slaughter, each animal was individually weighed to obtain the body weight at slaughter (BWS). The weights and yields of non-carcass components were evaluated, weights and yields of regional dishes (Buchada and Panelada). The addition of different levels of red propolis extract (RPE) did not influence (p > 0.05) the weights and yields of non-carcass components, by-products and adipose deposits, to the weight and yield of regional dishes. The use of red propolis extract in diets up to the level studied (28 mL day-1) did not change the characteristics evaluated. ABSTRACT noncarcass non carcass RPE. RPE . Thirtyfive Thirty 1708 17 08 17.0 236 2 36 2.3 months replications 0 7 1 extractanimalday day BWS. BWS (BWS) Buchada Panelada. Panelada Panelada) (RPE p 0.05 005 05 byproducts by products deposits 28 (2 day1 day-1 170 17. 23 3 2. (BWS 0.0 00 ( day- 0.

ABSTRACT The objective of this study was to examine the effect of the increasing levels of inclusion of palm kernel cake (PKC) in the diet on the performance of feedlot heifers. Forty-eight Nelore heifers with an initial weight of 274 ± 4.58 kg, at 24 months of age, were confined for 98 days in a feedlot. The animals were allocated to the four treatments in a completely randomized design. Treatments consisted of PKC levels of 0 (control), 10, 20, and 30% in the total dry matter of the diet. The roughage:concentrate ratio in the diets was 30:70. Ether extract intake increased, whereas the intakes of non-fiber carbohydrates and total digestible nutrients decreased with the inclusion of PKC. The apparent digestibility of all nutrients decreased, as well as the amounts of nitrogen digested and retained. Microbial protein synthesis and its efficiency also declined. The inclusion of up to 20% PKC increased feeding time and reduced rumination time of heifers. Intake and rumination efficiencies decreased with the inclusion of PKC in the diet. Final weight and average daily gain did not change, but feed efficiency increased with the inclusion of PKC. The inclusion of up to 30% PKC in the diet of feedlot heifers is recommended. (PKC Fortyeight Forty eight 27 458 4 58 4.5 kg 2 age 9 design control, control , (control) 10 20 30 roughageconcentrate roughage concentrate 3070. 3070 70. 70 30:70 nonfiber non fiber retained declined change recommended 45 5 4. (control 1 3 307 7 30:7 30:

Abstract The objective of this study was to evaluate the economic viability, through different supplementation strategies, of the post-weaning and finishing stages of cattle supplemented on Brachiaria brizantha cv. Marandu pastures during the rainy and dry seasons. The experimental period was 447 d. The study comprised the post-weaning and finishing stages of 22 intact male crossbred (½ Holstein-Zebu) cattle with an average initial weight of 164.09 ± 12.13 kg and an average age of 7 mo. The animals were distributed in a randomized design with 11 replications per treatment. The following supplementation strategies were tested: strategy 1 (S1): Mineral mix in the 1st and 3rd periods and protein-energy supplementation at 0.2 % of the body weight (BW) in the 2nd period; and strategy 2 (S2): protein-energy supplementation at 0.4 % BW in the 1st and 3rd periods, and protein-energy supplementation at 0.6 % BW in the 2nd period. Strategy 1 resulted in a lower cost per arroba produced and lower cost per hectare, generating a greater net profit per hectare and consequently a higher internal rate of return. When herbage is available, mineral supplementation supplied during the rainy season, associated with low levels of protein-energy supplementation in the dry season (S1), is of greater economic attractiveness for the development of the project, as it leads to higher internal rates of return and net present values in the entire period.

Resumen El objetivo fue evaluar la viabilidad económica, a través de diferentes estrategias de suplementación, de las etapas post destete y finalización del ganado bovino suplementado en pastoreo de Brachiaria brizantha cv. Marandú durante las temporadas de lluvias y secas. El periodo experimental fue de 447 días. El estudio comprendió las etapas post destete y finalización de 22 bovinos machos (1/2 Holstein-Cebú) enteros con un peso inicial promedio de 164.09 ± 12.13 kg y una edad promedio de 7 meses. Los animales se distribuyeron en un diseño aleatorio con 11 repeticiones por tratamiento. Se probaron las siguientes estrategias de suplementación: estrategia 1 (E1): mezcla de minerales en el 1er y 3er periodos y suplementación de proteína y energía al 0.2% del peso corporal (PC) en el 2do periodo; y estrategia 2 (E2): suplementación de proteína-energía a 0.4% PC en los períodos 1º y 3º, y suplementación de proteína-energía a 0.6% PC en el 2º período. La estrategia 1 dio como resultado un menor costo por arroba producido y un menor costo por hectárea, generando una mayor ganancia neta por hectárea y, en consecuencia, una mayor tasa interna de retorno. Cuando se dispone de forraje, la suplementación de minerales suministrada durante la temporada de lluvias, asociada con bajos niveles de suplementación de proteína y energía en la estación seca (S1), es de mayor atractivo económico para el desarrollo del sistema, ya que conduce a mayores tasas internas de valores de retorno y valores netos presentes en todo el periodo.