(1 a 7 dias), de modo que, a partir do oitavo dia, todas as aves receberam a mesma ração. Adotou-se o delineamento experimental inteiramente casualizado, em arranjo fatorial 3 × 2 × 2, composto de 3 temperaturas de criação (alta 34 ± 1 o C; controle 32 ± 2 o C; e baixa 27 ± 2 o C), 2 níveis de extrato de levedura (com ou sem) e 2 níveis de prebiótico (com ou sem).As temperaturas ambiente alta e baixa prejudicaram o desempenho das aves aos 7 e aos 21 dias de idade. A inclusão de prebiótico na ração pré-inicial melhora o ganho de peso das aves criadas sob baixa temperatura aos 21 dias de idade e aumenta a viabilidade até os 21 dias de idade. A adição do extrato de leveduras melhora a conversão alimentar aos 21 dias de idade. Palavras-chave: estresse térmico, mananoligossacarídeos, ração pré-inicial, Saccharomyces cerevisiae Performance of broilers from 1 to 21 days old fed diets with yeast extract and prebiotic, reared at different temperaturesABSTRACT -The performance of broilers reared at different temperatures and fed diet with or without yeast extract and/or prebiotic in the starter phase was evaluated. One thousand, four hundred and forty 1-d male Cobb-500® were reared at different climatic chambers. The diets with or without yeast extract or prebiotic were fed only in the starter phase(1 to 7 days), and from the 8 th day on all broiler were fed the same commercial diet. It was used a complete randomized experimental design, as a 3 × 2 × 2 factorial arrangement, with 3 rearing temperatures (high 34 ± 1 o C, control 32 ± 2 o C and low 27 ± 2 o C), 2 yeast extract level (with or without) and 2 prebiotic level (with or without). High and low temperatures decreased the performance of brids at 7 and 21 days old. The inclusion of prebiotic in the pre-starter phase increased weight gain of birds under low temperature at 21 days old and the viability until 21 days old. The inclusion of yeast extract increase feed conversion at 21 days old.

-The objective of this research was to evaluate the performance, carcass yield and intestinal morphometry of broiler chickens raised under different temperatures that received feed with or without yeast extract and prebiotic in the pre-initial phase. One thousand four hundred and forty one-day old male chicks were used, raised in different climate chambers.Feed with or without the addition of yeast extract and prebiotic was offered only in the pre-initial phase (1 to 7 days). From the eighth day on, every chick received the same feed, readjusted according to usual recommendations. A randomized complete experimental design was used in a 3 × 2 × 2 factorial arrangement, consisting of three environmental temperatures (hot, comfort and cold) and two levels of yeast extract (with or without) and prebiotic (with or without). The performance of the birds was evaluated considering weight gain, feed intake, food conversion and viability at 42 days of age. Carcass yield and intestinal morphometry were also evaluated. Environmental heat impaired performance and carcass yield. Prebiotic inclusion in the pre-initial feed increased weight gain and enhanced food conversion of birds raised under hot conditions. The inclusion of products in the feed of broiler chickens raised in hot and cold environments has beneficial effects on chicken intestinal villi.Key Words: carcass yield, heat stress, intestinal morphometry, mannanoligosaccharides, performance, Saccharomyces cervisiae Extrato de leveduras e prebiótico na dieta pré-inicial de frangos de corte criados em diferentes temperaturasRESUMO -Objetivou-se nesta pesquisa avaliar o desempenho, o rendimento de carcaça e a morfometria intestinal de frangos de corte criados em diferentes temperaturas e que receberam na fase pré-inicial ração contendo ou não extrato de leveduras e prebiótico. Foram utilizados 1.440 pintos machos de 1 dia de idade, criados em diferentes câmaras climáticas. As rações, acrescidas ou não de extrato de leveduras e prebiótico, foram oferecidas somente na fase pré-inicial (1 a 7 dias). A partir do oitavo dia, todas as aves receberam a mesma ração, reajustada de acordo com as recomendações usuais. Adotou-se o delineamento experimental inteiramente casualizado em arranjo fatorial 3 × 2 × 2, composto de três temperaturas de criação (calor, conforto e frio) e dois níveis de extrato de leveduras (com ou sem) e prebiótico (com ou sem). O desempenho das aves foi avaliado considerando o ganho de peso, o consumo de ração, a conversão alimentar e a viabilidade aos 42 dias de idade.Também foram avaliados o rendimento de carcaça e a morfometria intestinal. O calor ambiente prejudicou o desempenho e o rendimento de carcaça. A inclusão de prebiótico na ração pré-inicial aumentou o ganho de peso e melhorou a conversão alimentar das aves criadas no calor. A inclusão dos produtos na ração de frangos de corte criados em ambiente de calor e no frio tem efeito benéfico sobre as vilosidades das aves.

-The objective of this study was to assess the effect of the inclusion of passionflower (Passiflora alata) in diets on performance, behavior, heterophil/lymphocyte ratio (H/L), corticosterone plasma levels (CPL) and immune response of quails. The study was carried out using 192 birds, distributed in randomized blocks with 4 diets (0, 125, 250 and 375 and 0, 250, 500 and 750 mg of passionflower/kg of feed for the rearing and laying period, respectively), 8 replicates and 6 birds per experimental unit. The rearing period began when birds were 28 days of age and it lasted for 15 days. In this phase, it was evaluated daily feed intake, daily weight gain, feed conversion, viability, tonic immobility time, intensity of injuries, behavior, heterophil/lymphocyte ratio, and corticosterone plasma levels. Laying phase started when birds were 43 days of age and it finished when they were 140 days of age; it was compesed of six 14-day cycles in which it evaluated feed intake, feed conversion, egg production and quality, viability, tonic immobility time, intensity of injuries, behavior, heterophil/ lymphocyte ratio, corticosterone plasma levels and immune response. In the rearing period, the use of passionflower in the diet of quails influenced the behavioral parameters, and the birds became calmer, mainly at the dosage of 375 mg/kg of ration.However, in the laying period, passionflower was efficient in reducing stress in the quails, and the most promising results are observed when higher dosages of the phytotherapic were applied. Nevertheless, the dose of 750 mg/kg of feeeding reduces egg production, though it does not influence quality of eggs neither immune response of the quails.Key Words: behavior, corticosterone, heterophil/lymphocyte ratio, immune response, stress, tonic immobility Efeitos da utilização de passiflora em rações de codornas japonesas nas fases de recria e postura

415Efeito da inclusão da camomila no desempenho, comportamento e estresse em codornas durante a fase de recria.Ciência Rural, v.40, n.2, fev, 2010. Ciência Rural, Santa Maria, v.40, n.2, p.415-420, fev, 2010

ResumoEste estudo teve como objetivo avaliar o efeito da kava-kava (Piper methysticum) como fi toterápico na alimentação de codornas na fase de postura. Avaliou-se o desempenho (consumo de ração, conversão alimentar, peso dos ovos e produção), qualidade de ovos, tempo em imobilidade tônica (TIT), intensidade de ferimentos e relação heterófi lo: linfócito (H:L). Foram utilizadas 90 codornas com 21 semanas de idade, divididas em blocos ao acaso e submetidas a três tratamentos (0, 300 e 600mg de extrato seco de kava-kava/kg de ração), cinco repetições e seis aves por parcela. A kava-kava utilizada na alimentação de codornas de postura não tem efeito sobre o desempenho, qualidade de ovos, intensidade de ferimentos e relação H:L, entretanto ocorre redução no tempo de permanência em imobilidade tônica com a inclusão de kava-kava, o que predispõe a uma redução do estresse. Unitermos: comportamento, Coturnix coturnix, estresse, fi toterápico, ovos, Piper methysticum AbstractKava-kava as a herbal additive in feed for laying quails. The objective of this study was to evaluate the effect of dietary kava-kava (Piper methysticum) during the laying period on performance (feed intake, feed conversion, weight of eggs and production), egg quality, tonic immobility time (TIT), intensity of injuries and blood heterophil/lymphocyte ratio (H:L). A total of 90 female Japanese quails of 21 weeks of age were distributed in a completely randomized experimental design and submitted to three treatments (0, 300 and 600mg of dried extract of kava-kava/kg of feed), with fi ve replicates and six birds, in each batch. Kava-kava fed to laying quails has no effect on performance, egg quality, intensity of injury or H:L ratio. However, there is a reduction in time spent in tonic immobility with the inclusion of kava-kava that predisposes the quail to a reduction of stress.