ABSTRACT We evaluated the technical feasibility of purified glycerin inclusion in balanced diets of broiler chickens treated from 1 to 42 days of age. A total of 240 broiler chickens were distributed in a completely randomized design into four treatments (0, 2, 4, and 6% purified glycerin inclusion), with six replicates of 10 broilers each. We evaluated productive performance (at 7, 21, and 42 days), edible viscera (heart, liver, and gizzard), carcass yield and cuts, color, chemical and physical composition, as well as protein and fat deposition in the breast muscle. Dietary inclusion of purified glycerin reduced feed conversion and increased feed intake, weight gain, and weight at seven days. From 1 to 21 days, there was a decrease in feed conversion and a linear increase in weight gain, with no effect on feed intake. Considering the total experimental period, increasing glycerin levels increased weight gain and weight at 42 days, with no effects on feed conversion or feed intake. Similarly, there was no effect on carcass and cut yields, liver and gizzard yields, and weight or length of the intestine, while heart yield was decreased. There was a linear increase in crude protein, ether extract, protein, and fat deposition and a reduction in moisture percentages, with no effect on ash content. Purified glycerin levels did not affect a*, b*, L*, pH, temperature, shear force, or weight loss by cooking in breast meat. The dietary inclusion of purified glycerin of up to 6% proved to be technically feasible in the diets of broilers from 1 to 42 days.

RESUMO Foram avaliados o desempenho e a cor da pele de frangos de corte de crescimento lento no período de 30 a 90 dias, alimentados com dietas com diferentes inclusões de bagaço de mandioca e colorífico de urucum. 308 frangos de corte de crescimento lento foram utilizados em um delineamento experimental inteiramente casualizado, em esquema fatorial com tratamento adicional 3 X 2 + 1, sendo três níveis de colorífico de urucum como agente pigmentante (1%, 2% e 3%), dois níveis de bagaço de mandioca (10% e 20%) e um tratamento adicional (dieta de controle), totalizando sete tratamentos, quatro repetições e 11 frangos de corte por unidade experimental. O consumo de ração e a conversão alimentar foram influenciados pelos tratamentos, com interação. O ganho de peso e o peso final foram influenciados pelos tratamentos (p<0,001) e os melhores resultados foram encontrados para a inclusão de 10% de bagaço de mandioca e 2% de colorífico de urucum. Não houve efeito dos tratamento e nenhuma interação sobre o rendimento da carcaça. Os parâmetros de cor L *, a * e b * não foram influenciados pelos tratamentos. É recomendável a inclusão de bagaço de mandioca a 10% e 1% de colorífico de urucum para frangos de crescimento lento de 30 a 90 dias de idade. No entanto, o uso desses ingredientes provou ser economicamente inviável.

SUMMARY The performance and breast skin color of slow-growing broilers from 30 to 90 days old fed diets with different inclusions of cassava bagasse and annatto colorific were evaluated. 308 slow-growing broilers were used in a completely randomized experimental design, in a factorial scheme with an additional treatment 3 X 2 + 1, with three levels of annatto colorific as a pigmentant agent (1%, 2% and 3%), two levels of cassava bagasse (10% and 20%) and an additional treatment (control diet), totaling seven treatments, four replicates and 11 broilers per experimental unit. Feed intake and feed conversion were affected by treatments, with interaction. The weight gain and final weight were influenced by the treatments and the best results were found for the inclusion of 10% cassava bagasse and 2% annatto colorific. There was no effect of treatment and no interaction on carcass yield. The color parameters L*, a* and b* were not influenced by treatments. The inclusion of 10% cassava bagasse and 1% annatto colorific for slow-growing broilers from 30 to 90 days of age is recommended. However, the use of these ingredients proved to be economically unfeasible.

RESUMO Objetivou-se neste trabalho avaliar o efeito da gravidade específica de ovos de matrizes pesadas com diferentes idades no rendimento de incubação e no peso dos pintos pós-eclosão. Foram utilizados 3.072 ovos oriundos de dois lotes de matrizes pesadas, linhagem Cobb – 500®. Os ovos foram distribuídos em delineamento experimental inteiramente casualizado, em esquema fatorial 2x4, com duas idades de matrizes (53 e 64 semanas) e quatro diferentes densidades (1.070, 1.075, 1.080, 1.085), totalizando oito tratamentos e quatro repetições (com 96 ovos por unidade experimental). As variáveis avaliadas foram o peso do ovo (g), a taxa de eclosão (%), a taxa de fertilidade (%), a perda de peso dos ovos durante o período de incubação (%) e a relação do peso dos pintos/peso dos ovos (%). Os resultados foram submetidos à análise de variância, sendo que o efeito das densidades foi avaliado por meio de regressão polinomial e o efeito da idade das matrizes pelo teste F, ao nível de 5% de probabilidade. As perdas de peso dos ovos, exceto para as densidades de 1.075 e 1.085, oriundos de matrizes com 53 e 64 semanas de idade, respectivamente, apresentaram-se dentro dos valores recomendados na literatura. O peso do pinto ao nascer foi proporcional ao peso do ovo, representando em média 68% e sem diferenças entre a idade das matrizes e as diferentes densidades. A idade da matriz exerceu influência no rendimento de incubação, sendo as maiores taxas de fertilidade e eclosão total (p<0,05) obtida pelos ovos oriundos de matrizes com 53 semanas de idade.

SUMMARY The objective of this work was to evaluate the effect of specific gravity of eggs from broiler breeders of different ages in the yield of incubation and the weight of post-hatch chicks. Were used 3.072 eggs from two batches of broiler breeders, Cobb - 500®. The eggs were distributed a completely randomized design in a 2x4 factorial design with two broiler breeder ages (53 and 64 weeks) and four different egg densities (1.070, 1.075, 1.080, 1.085), totaling eight treatments and four replications (with 96 eggs per experimental unit). The evaluated variables were the egg weight (g), the hatching rate (%), the fertility rate (%), the weight loss of eggs during the incubation period (%) and the ratio of the weight of the chicks/egg weight (%). The results were submitted to analysis of variance, being that the effect of density was assessed by polynomial regression and the age effect of breeders by F test at 5% probability. Weight losses of eggs, except for the densities of 1,075 and 1,085, from breeders with 53 and 64 weeks of age, respectively, were within the values recommended in the literature. The chick weight was proportional to the weight of the egg, representing on average 68% and no differences between age and density of broiler breeders. The age of the breeders exerted influence on the yield of incubation, and the best results (p<0.05) obtained by eggs from breeders with 53 weeks of age.

<p>O trabalho foi desenvolvido com o objetivo de avaliar a viabilidade técnica e econômica da inclusão da farinha do mesocarpo do babaçu, em dietas de frangos de corte de 22 a 42 dias de idade. Foram utilizados 80 frangos de corte, machos, da linhagem Cobb 500^®, distribuídos em delineamento experimental inteiramente casualizado com quatro tratamentos (0; 6; 12 e 18% de inclusão da farinha do mesocarpo de babaçu)e cinco repetições, sendo cada parcela experimental composta por 4 aves. Aos 42 dias de idade as aves e as rações experimentais foram pesadas para obtenção do desempenho (consumo de ração, ganho peso e conversão alimentar). O ganho de peso e oconsumo de ração foram afetados pelos tratamentos (P<0,05), não havendo efeito para conversão alimentar, rendimento de carcaça e cortes nobres (P>0,05).Foram observadas diferenças (P<0,05) no sangue para os níveis de albumina, onde a inclusão de 12% demonstrou menores níveis.O menor custo com alimentação por kg de GP foi obtido com a ração com 6% de inclusão da FMB, o que resultou na maior margem bruta. Concluiu-se que a farinha do mesocarpo do babaçu é técnica e economicamente viável em até 6% em rações para frangos de corte de 22 a 42 dias de idade.</p>

<p>The work was to evaluate the technical and economic feasibility of including the inclusion of the babassumesocarp flour in diets for broilers from 22 to 42 days old. 80 broilers, male Cobb 500^® line were distributed in a completely randomized design with four treatments (0, 6, 12 and 18 % inclusion flour babassumesocarp) and five replicates and each plot were used consisting of 4 birds. At 42 days of age the birds and the experimental diets were weighed for obtaining performance (feed intake, weight gain and feed conversion). Weight gain and feed intake were affected by treatments (P < 0.05), with no effect on feed conversion, carcass yield and prime cuts (P > 0.05). Differences (P< 0.05) on blood levels of albumin, where the addition of 12% showed lower levels were observed. The lowest feed cost per kg GP was obtained in the diet with 6 % inclusion of FMB, which resulted in higher gross margin. It was concluded that the flour from babassumesocarp is technically and economically feasible in up to 6 % in diets for broilers from 22 to 42 days old.</p>