RESUMOEvaluation of performance and carcass yield in four broiler chicken lineages in two system of rearing ABSTRACT -The objective of this work was to evaluate performance and carcass and dressing yields of four broiler chicken lineages raised in confined and semi-confined systems. It was used 1,440 chicks distributed in a random block design with a 4 × 2 factorial scheme, composed of lineage types (Ross 308, Máster Griss, Label Rouge and Vermelhão Pesado) and two production systems (confinement and semi-confinement), each one with four replications with 45 birds. At 84 days of age, four birds of each repetition were slaughtered, totaling 128 birds, for evaluation of carcass and dressing yields. Access to the paddock (semi-confinement) did not affect performance neither the yield of the carcass of the lineages, except abdominal fat yield, which was the lowest in the semi-confined birds. Considering only birds of colonial lineage, Máster Griss and Vermelhão Pesado showed the best results for weight and Label Rouge, the best feed intake. Broilers of Master Griss, Label Rouge and Vermelhão Pesado, compared to the Ross commercial lineage, showed the highest dressing yield, except for breast and breast meat, which were the highest in Ross lineage. Choice of lineage must be done accordingly to the market interest, since there are differences on performance and yield of dressing and carcass.Key Words: carcass, confined, exercise, free range type, semi-confined IntroduçãoA criação de aves para produção de carne tipo caipira é um dos segmentos mais promissores da avicultura alternativa, tendo em vista a demanda por produtos mais saborosos, firmes e com sabor pronunciado. Essas características correspondem a animais adultos, próximos da maturidade sexual e que não sofreram melhoramento genético intenso (linhagens caipiras) ou que foram submetidas ao exercício (criação extensiva ou em semiconfinamento) (Bastianelli, 2001). As principais características desejadas nesses tipos de criação são: segurança alimentar, qualidade sensorial do produto, preocupação com o meio ambiente, bem-estar dos animais e saúde do consumidor.Atualmente, a produção de frangos de corte adota critérios importantes de produtividade, como rendimento R. Bras.

RESUMOObjetivou-se avaliar o efeito da suplementação com glutamina e nucleotídeos na dieta sobre o desempenho e morfologia da mucosa intestinal de frangos de corte criados no sistema alternativo. Foram utilizados 600 pintos de corte machos distribuídos em delineamento em blocos casualizados, no esquema fatorial 3x2 (três níveis de glutamina: 0,0; 0,5 e 1,0% e dois níveis de nucleotídeos purificados na dieta: 0,0 e 0,04%), totalizando 6 tratamentos, com 4 repetições de 25 aves cada. Foram obtidos os dados de desempenho (peso corporal, ganho de peso, consumo de ração, conversão alimentar e mortalidade) aos 7, 21 e 42 dias de idade. Ao final do experimento foram abatidas 4 aves/tratamento para avaliação do peso de órgãos e da morfologia intestinal. A adição de 1% na dieta melhorou o ganho de peso, consumo de raçao e conversão alimentar na primeira semana de idade. Não sendo encontrados resultados positivos nos períodos de 21 e 42 dias de idade. A suplementação de glutamina e nucleotídeos em dietas de frangos de corte criados no sistema alternativo não influencia o desempenho e a morfologia intestinal, a inclusão de 1,0% de glutamina no período de 1 a 21 dias de idade, favorece o desempenho das aves. SUMMARYThe experiment was conducted to evaluate the effect of supplementing glutamine and nucleotides on growth performance and development intestinal morphology in broiler chicks. In the trial, 600 male broiler chicks distributed in randomized blocks in a 3x2 factorial arrangement (consisting of a uniform basal diet supplemented with: 0.0, 0.5 or 1.0% glutamine, and 0.0 or 0.04% nucleotides), for a total of 6 treatments with 25 birds each. Means of performance (weight, weight gain, feed intake, feed conversion and mortality) were obtained 7, 21 and 42 days of age. At the end of the experiment 4 broilers per treatment were used to determine organs weight and development intestinal morphology. Glutamine supplementation (1%) improved the body weight, feed intake and feed conversion in the first week. Glutamine and nucleotides supplementation did not affect performance in broiler chicks in the period one to 21 and one to 42 days of age. In conclusion, it was demonstrated that feeding 1.0% glutamine improved growth performance of broiler birds at 21 days of age. INTRODUÇÃONo Brasil, como em outros países, temse observado crescente preocupação dos consumidores com a origem e qualidade dos produtos, exigindo alimentos saudáveis e ausência de resíduos. Com isso, as empre-

This study aimed at evaluating the effect of nucleotides on the performance and carcass yield of broilers fed diets with no antibiotic growth promoters (AGP), anticoccidials, or animal feedstuffs. In the trial, 600 Ross 308 male broilers were distributed in a completely randomized experimental design into six treatments with four replicates of 25 birds each. Treatments consisted of a control diet (CD), CD + AGP, CD + 0.04%, CD + 0.05%, CD + 0.06%, and CD + 0.07% nucleotides. The experimental diets did not contain anticoccidials, and birds were vaccinated against coccidiosis at three days of age. No significant differences were detected among broilers submitted to the different treatments in none of the studied parameters. Under the conditions of this experiment, diets supplemented with nucleotides did not influence broiler performance or carcass yield at 42 days of age, and were not different from the feeds not containing any additive or with AGP.

INucleotídeos na dieta de frangos de corte e seus efeitos sobre taxa de turnover da mucosa intestinal antes e após lesões causadas por coccidiose Nucleotides in broilers challenged diet and its effects on intestinal mucosa turnover rate before and after injuries caused by coccidiose

The objective of the present study was to trace the inclusion of poultry offal meal (POM) in the diet of meat-type quails reared for a long period using the technique of stable isotopes. A number of 320 quails were randomly distributed into eight treatments: vegetable diet (T1), and a diet containing 8% POM were fed until the end of the experimental period (T2) or replaced by the vegetable diet on day 42 (T3), 56 (T4), 70 (T5), 84 (T6), 98 (T7), and 112 (T8). Breast muscle samples were collected from four birds randomly selected per treatment every 14 days. The obtained isotope results were submitted to multivariate analysis of variance (MANOVA) with the aid of the GLM procedure of statistical SAS program. Treatments were different from T1 when birds were sacrificed at least two weeks after the diet was changed. T2 results were different from T1 in all evaluated periods. It was concluded that it is possible to trace poultry offal meal inclusion in a strictly vegetable diet after the diet was changed for at least 14 days.