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The aim of this study was to investigate the effects of including purified glycerin in the diets of broilers from 22 to 42 days of age. Eighty Cobb 500® lineage broilers were distributed in a completely randomized design (CRD) to one of four treatment groups (0, 2, 4 and 6% of purified glycerin inclusion in feed) and five replicates of four birds. The birds were evaluated for performance (weight gain, feed intake and feed conversion); carcass yield; special cuts yield (thigh, drumstick and breast); muscle colour (L* = lightness, a* = redness, b* = yellowness); and crude protein, ether extract and moisture content of the breast muscle. Inclusion of purified glycerin in the diet did not affect (p > 0.05) any of the growth performance indicators, which demonstrated the technical feasibility of including up to 6% glycerin in the diet. Similarly, there was no effect on carcass yield; special-cut yields; muscle colour (L* = lightness, a* = redness, b* = yellowness); or crude protein, ether extract and moisture content of breast muscle. The inclusion of purified glycerin at up to 6% in the diet proved to be feasible in broilers treated from 22 to 42 days of age.

Aqui nós avaliamos a viabilidade da inclusão de glicerina purificada em dietas balanceadas para frangos de corte de 8 a 42 dias de idade. Para tanto, foram utilizados 160 fios de 8 dias de idade da linhagem Cobb 500®, distribuídos em delineamento inteiramente casualizado (CRD) com quatro tratamentos (0, 2, 4 e 6% de inclusão de glicerina purificada) e quatro repetições. de dez pássaros. Foram avaliados o consumo de ração, ganho de peso, rotação alimentar, peso final, biometria de coração, fígado, moela e intestino delgado, rendimento de carcaça, cortes especiais, coxa e sobrecoxa. de proteína e gordura. no músculo do peito.Os níveis de inclusão de glicerina purificaram nas dietas influenciaram (p <0,05) o ganho de peso, um peso alimentar eo peso de corte aos 42 dias, sem efeito (p> 0,05) sem consumo de ração (FI ). The same form, not much effect (p> 0. 05) nos income de carcaça e cortes especiais. Os níveis de inclusão de glicerina não são influenciados (p> 0,05) o peso relativo da moela, nem o peso e a duração do intestino delgado. No entanto, os níveis de inclusão de glicerina aumentaram os pesos do coração e do fígado (p <0,05).Os níveis de inclusão de glicerina purificada nas dietas não afetaram (p> 0,05) os valores de leveza (L *), vermelhidão (a *), amarelecimento (b *), pH ou proteína, mas aumentaram (p <0,05) a deposição de gordura no músculo do peito. Com base em nossos achados, propomos que a inclusão de 6% de glicerina purificada em dietas é tecnicamente viável para frangos de corte de 8 a 42 dias de idade. os níveis de inclusão de glicerina purificada afetaram os pesos relativos do coração e do fígado (p <0,05). Os níveis de inclusão de glicerina purificada nas dietas não afetaram (p> 0,05) os valores de leveza (L *), vermelhidão (a *), amarelecimento (b *), pH ou proteína, mas aumentaram (p <0,05) a deposição de gordura no músculo do peito. Com base em nossos achados, propomos que a inclusão de 6% de glicerina purificada em dietas é tecnicamente viável para frangos de corte de 8 a 42 dias de idade. os níveis de inclusão de glicerina foram relacionados com o peso do coração e do fígado (p <0,05). Os níveis de inclusão de glicerina purificados nas dietas não afetaram (p> 0,05) os valores de leveza (L *), vermelhidão (a *), amarelecimento (b *), pH ou proteína, mas aumentaram (p <0, 05) a deposição de gordura no peito. Com base em nossos achados, propomos que a inclusão de 6% de glicerina purificada em dietas é tecnicamente viável para frangos de corte de 8 a 42 dias de idade.

Non-ruminants Full-length research article Purified glycerin in balanced diets of broiler chickens treated from 1 to 42 days of age 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.

The objective of this study was to evaluate the behavioural parameters and surface temperatures of broilers fed different vitamin E levels. A total of 240 male, day-old Cobb 500® broiler chicks were raised until the seventh day of life, according to the recommendations for the strain, receiving feed with only 50% of vitamin E requirements. At eight days of age, the birds were weighed and standardised, and the treatments distributed in a completely randomised design with four treatments (50, 100, 150 and 200% of vitamin E requirements) and six replicates of ten birds per experimental unit. The variables evaluated were the behavioural parameters of the birds (eating, drinking, idleness and other activities) and the feed intake within 24 hours as well as the maximum and minimum surface temperatures, and thermal amplitudes at the end of each life cycle (21 and 42 days). Vitamin E levels did not influence behavioural parameters or feed intake over 24 hours at 21 and 42 days of age. There was no interaction between vitamin E levels and maximum and minimum temperatures or thermal amplitudes. However, the maximum and minimum temperatures and thermal amplitudes were influenced by the morning and afternoon periods at 21 and 42 days of age. Dietary vitamin E levels did not influence the behavioural patterns of broilers at 21 and 42 days of age.

This study aimed to evaluate the performance and meat quality of broilers fed different levels of alpha-tocopherol. A total of 240 one-day-old Cobb 500® male broiler chicks were reared until day 7 of life, as recommended by the commercial line, and were fed at only 50% of the alpha-tocopherol requirement. At day 8, the chicks were weighed, homogenized, and allotted in a completely randomized design with four treatments (50, 100, 150, and 200% alpha-tocopherol requirement) and six replicates of ten chickens per experimental unit. Several variables were evaluated: weight gain, feed intake, feed conversion, carcass yield and prime cuts (drumstick, thigh, and breast), edible viscera (heart, liver, gizzard), immune organs (cloacal bursa and spleen), intestine weight and length, abdominal fat, breast meat color (lightness, redness, and yellowness), pH, cooking loss, and shear force of the breast meat. Dietary alpha-tocopherol levels did not influence broiler performance, carcass yield, and prime cuts at 42 days of age. The edible viscera, immune organs, the length of the small intestine, and the abdominal fat, as well as the meat color (lightness, redness, and yellowness), pH, cooking loss, and shear force of the breast meat, were not influenced. However, the small intestine yield increased linearly with increasing levels of alpha-tocopherol. The dietary levels of alphatocopherol did not influence the performance and meat quality of broilers from 8 to 42 days of age.

This paper aimed to evaluate the metabolizability, performance and economic viability of purified glycerin inclusion in balanced diets fed to chicken broilers from 8 to 21 days old. Two experiments were conducted. In the first experiment, 100 broilers (14 days old) were distributed in a completely randomized design into two treatments, with five replications of 10 broilers. Treatments consisted of a control diet and a test diet, in which purified glycerin replaced 10% of the control diet. In the second experiment, 200 broilers (8 days old) were distributed in a completely randomized design into four treatments (0, 2, 4 and 6% of purified glycerin inclusion), with five replications of 10 broilers. The weight gain, feed intake, feed conversion, final weight, apparent metabolizable energy (AME), nitrogen-corrected apparent metabolizable energy (AMEn), metabolizability coefficients of dry matter (DMMC), crude protein (CPMC) and gross energy (GEMC), and the cost of feed per kg of broiler produced were evaluated. The AME, AMEn, DMMC, CPMC and GEMC from the purified glycerin were 3790 and 3560 kcal/kg, and 83.72, 71.52 and 86.27%, respectively. The glycerin levels did not affect (p>0.05) any of the performance characteristics (weight gain, feed intake, feed conversion and final weight). The lowest feeding cost and the highest gross margin were obtained for broilers fed with 6% purified glycerin. The inclusion of 6% purified glycerin in balanced diets for broilers from 8 to 21 days old was technically and economically feasible.

Objetivou-se avaliar o desempenho e a qualidade de carne de frangos de corte alimentados com dois níveis de vitamina D3 e criados sobre dois tipos de cama. Utilizou-se 160 pintos de corte da linhagem Cobb 500®, que foram distribuídos em delineamento experimental inteiramente casualizado, em arranjo fatorial 2x2, dois níveis de vitamina D3 (100 % e 200% da exigência) e dois tipos de cama (maravalha e casca de arroz), com quatro tratamentos e cinco repetições com 24 Kg/m2 de carne. Foram avaliados o desempenho produtivo, rendimento de carcaça, cortes nobres, pesos relativos das vísceras comestíveis, órgãos imunes, peso e comprimento do intestino delgado, gordura abdominal, coloração da carne, pH, perda de peso por cocção e a força de cisalhamento do músculo do peito. Observou-se que os tratamentos não influenciaram o consumo de ração, conversão alimentar e o peso corporal. O ganho de peso foi influenciado pelos diferentes tipos de cama. Houve interação entre a vitamina e cama para o consumo de ração e o ganho de peso. Os tratamentos não afetaram os rendimentos e comprimento do intestino delgado. O desempenho e a qualidade da carne de frangos de corte não foram influencidas pelos níveis de vitamina e tipos de camas dos 8 aos 42 dias de idade.