ABSTRACT The objective of this study was to evaluate the L-arginine supplemental effects for broilers in the final rearing phase (29 and 42 days), during which they were exposed to heat stress and fed diets with different metabolizable energy levels. Performance, carcass parameters, and physiological and biochemical parameters related to lipid metabolism were evaluated. A completely randomized design was used, in a 3 × 2 factorial arrangement, corresponding to three metabolizable energy levels (3000, 3150, and 3300 kcal/kg) in diets supplemented or not with L-arginine (0.66%). Eight replicates composed by eight broilers each (experimental units; boxes) per treatment were evaluated, totaling 48 experimental units. Performance was evaluated in the period from 29 to 42 days old, and carcass and blood parameters were measured at 42 days old. L-arginine supplementation improved feed conversion and blood profile, mainly due to the reduction of total and LDL-cholesterol levels. Broilers that received 3300 kcal/kg of metabolizable energy showed the greatest weight gain, regardless of supplementation or not with arginine. The dietary supplementation with 0.66% of L-arginine for heat-stressed broilers can be recommended, regardless of the feed energy level. Larginine L arginine (2 4 days, , days) used arrangement 3000, 3000 (3000 3150 330 kcalkg kcal kg 0.66%. 066 . 0 66 (0.66%) units boxes old profile LDLcholesterol LDL cholesterol gain 0.66 heatstressed stressed recommended level ( 300 (300 315 33 06 6 (0.66% 0.6 30 (30 31 (0.66 0. (3 (0.6 (0. (0

Resumo A nutrição na criação de coelhos representa cerca de 70% de todos os custos; nesse sentido, a Cratylia argentea é uma excelente alternativa como alimento devido à sua composição bromatológica. Nosso objetivo foi avaliar o valor nutricional de dietas formuladas com folhas secas de C. argentea na alimentação de coelhos em crescimento. Foram utilizados 28 coelhos brancos da raça Nova Zelândia, com 55 dias de idade, de ambos os sexos. Dois tratamentos (n = 14, 7 machos e 7 fêmeas) foram avaliados em delineamento experimental de blocos casualizados em esquema fatorial 2 x 2. A dieta controle (CTRL) foi formulada para atender às exigências nutricionais de coelhos em crescimento, e a dieta teste (DRY) foi obtida substituindo 20% da dieta CTRL por folhas secas de C. argentea. O período experimental compreendeu 11 dias, sendo sete dias de adaptação e quatro dias de coleta total de fezes. O ganho médio diário, o consumo de matéria seca, a conversão alimentar e o peso corporal final não foram afetados pela substituição da dieta CTRL por folhas secas de C. argentea. O coeficiente de digestibilidade da matéria seca apresentou melhores resultados nos coelhos CTRL (Fêmea: 72,19%, Macho: 72,48%). Coelhos alimentados com a dieta CTRL apresentaram maior consumo de proteína bruta do que os alimentados com a dieta DRY, porém esses coelhos tiveram maior excreção e menor retenção de proteína bruta. Conclui-se que Cratylia argentea apresenta valores de 1.400,67 kcal de energia digestível por kg de matéria seca e 3,34% de proteína digestível por kg de matéria seca. 70 custos sentido bromatológica C crescimento Zelândia 5 idade sexos n 14 fêmeas (CTRL DRY (DRY 20 1 fezes diário Fêmea (Fêmea 7219 72 19 72,19% Macho 72,48%. 7248 72,48% . 48 72,48%) Concluise Conclui se 140067 400 67 1.400,6 334 3 34 3,34 721 72,19 724 72,48 4 14006 40 6 1.400, 33 3,3 72,1 72,4 1400 1.400 3, 72, 140 1.40 1.4 1.

Abstract Nutrition in rabbit farming accounts for about 70% of all costs; in this sense, C. argentea is an excellent alternative as a feed, due to its bromatological composition. Our goal is to evaluate the nutritional value of diets formulated with the dried leaves of C. argentea to feed growing rabbits. Twenty-eight white rabbits of the New Zealand breed, 55 days old, of both sexes, were used. Two treatments (n = 14, 7 males, and 7 females) were evaluated in a randomized block experimental design in a 2 x 2 factorial scheme. The control diet (CTRL) was formulated to meet the nutritional requirements of growing rabbits, and the test diet (DRY) was obtained by replacing 20% of the CTRL diet with dried leaves of C. argentea. The experimental period was comprised of 11 days, with seven days of adaptation and four days of total feces collection. The average daily gain, dry matter intake, feed conversion, and final body weight were not affected by replacing the CTRL diet with the dried leaves of C. argentea. The coefficient of dry matter digestibility showed better results in CTRL rabbits (female: 72.19%, male: 72.48%). Rabbits fed with the CTRL diet exhibited a higher consumption of crude protein compared to those fed with the DRY diet, however, these rabbits showed higher elimination and lower retention of crude protein. It is concluded that C. argentea presents values of 1,400.67 kcal per kg of dry matter, digestible energy, and 3.34% digestible protein per kg of dry matter. 70 costs sense C composition Twentyeight Twenty eight breed 5 old sexes used n 14 males females scheme (CTRL (DRY 20 1 collection gain intake conversion female (female 7219 72 19 72.19% male 72.48%. 7248 72.48% . 48 72.48%) however 140067 400 67 1,400.6 energy 334 3 34 3.34 721 72.19 724 72.48 4 14006 40 6 1,400. 33 3.3 72.1 72.4 1400 1,400 3. 72. 140 1,40 1,4 1,