Broilers fed with diets formulated with different levels of avP, Ca and Na and increasing doses of phytase have shown no change on performance, quantitative carcass characteristics, ash and phosphorus deposition in tibia and weight of organs.

RESUMO: Com o objetivo de avaliar o efeito da temperatura de conservação e o período de estocagem sobre a qualidade externa e interna de ovos brancos comerciais. Foram utilizados 375 ovos tipo extra de poedeiras comerciais brancas da linhagem Hy-line. distribuídos em delineamento inteiramente casualizado em esquema fatorial 2 x 7 (temperatura x período de armazenamento), totalizando 14 tratamentos com cinco repetições de três ovos cada. Os tratamentos foram: temperatura ambiente (26,5ºC) e refrigerada (11°C) e sete períodos de armazenamento (zero, cinco, 10, 15, 20, 25 e 30 dias). Houve interação (P<0,05) entre os fatores avaliados para os valores de percentagem de albúmen e gema, unidade Haugh, índice de gema e coloração de gema crua, observando redução da qualidade interna dos ovos ao longo do armazenamento em temperatura ambiente em relação aos ovos refrigerados. O avanço do período de armazenamento a perda de peso dos ovos aumentou de forma quadrática (P<0,05) e a gravidade específica reduziu linearmente (P<0,05). A perda de peso dos ovos PP foi intensificada em temperatura ambiente. Conclui-se que ovos brancos armazenados em temperatura ambiente apresentam perdas acentuadas de qualidade, principalmente interna durante a estocagem até 30 dias. Ovos mantidos sob refrigeração podem ser armazenados até 20 dias sem alteração da qualidade interna. Palavras-chave: Índice de gema, gravidade específica, poedeiras leves, unidade haugh QUALITY OF COMMERCIAL WHITE EGGS STORED AT DIFFERENT STORAGE TEMPERATURES AND STORAGE PERIODSABSTRACT: The aim of this study was to evaluate the effect of storage temperature and storage period on the external and internal quality of commercial white eggs. A total of 375 extra eggs of commercial white laying hens of the Hy-line line were allocated in a completely randomized design in a 2 x 7 factorial scheme (temperature x storage period), totaling 14 treatments with five replicates of three eggs each. The treatments were room temperature (26.5ºC) and refrigerated (11ºC) and seven storage periods (0, 5, 10, 15, 20, 25, and 30 days). There was an interaction (P<0.05) between the factors evaluated for percentage of albumen and yolk, Haugh unit, yolk index and raw yolk color. A reduction in the internal quality of the eggs was observed throughout storage at room temperature compared to refrigerated eggs. Weight loss of the eggs increased in a quadratic manner (P<0.05) and specific gravity decreased linearly (P<0.05) with increasing storage period. The weight loss was intensified at room temperature. In conclusion, white eggs stored at room temperature show marked quality losses, mainly during storage for up to 30 days. Eggs kept under refrigeration can be stored for up to 20 days without changes in internal quality.

To examine the association between phytase and xylanase in diets with nutritional adjustments on intestinal morphometry, serum biochemistry and microbiology of broilers, 250 broilers were evaluated in a completely randomized design with fi ve treatments and fi ve replicates. The following treatments were tested: positive control diet -without phytase or xylanase; negative control diet -with an energy reduction of 100 kcal/kg, without phytase or xylanase; and three diets containing xylanase and phytase and energy reductions of 50, 100 and 150 Kcal/kg. For all energyreduced diets, the nutritional matrix of phytase with phosphorus (0.15%), calcium (0.165%) and sodium (0.035%) was considered. An effect of the association between enzyme inclusion and metabolizable energy reduction in the diets was observed only by contrast analysis, for villus height. Intestinal health was not changed. Only the serum phosphorus concentration was altered by the treatments at the different evaluated ages. The association of phytase (500 FTU/kg) with xylanase (16000 BXU/kg) in diets with reductions of up to 150 Kcal/kg metabolizable energy, 0.15% digestible P, 0.165% Ca and 0.035% Na does not alter the intestinal morphometry, serum biochemistry or microbiology of broilers.

-The purpose of this study was to evaluate the effect of glutamine supplementation plans on performance, carcass yield, and cut yield of broilers reared in a high-temperature environment. A fully randomized design was adopted for the experiment, comprising 900 male Hubbard broiler chicks assigned to five treatment groups (0% glutamine from one to 42 days of age; 0.5% glutamine from 1 to 7 days of age, followed by 0% from 8 to 42 days; 1.0% glutamine from 1 to 7 days of age, followed by 0.5% from 8 to 14 days and 0% from 15 to 42 days; 1.5% glutamine from 1 to 7 days of age, followed by 1.0% from 8 to 14 days, 0.5% from 15 to 21 days, and 0% from 22 to 42 days; 2.0% glutamine from 1 to 7 days of age, followed by 1.5% from 8 to 14 days, 1.0% from 15 to 21 days, and 0% from 22 to 42 days), consisting of six replicates of 30 animals each. The experiment was composed of four periods: pre-starter (1-7 days), starter (8-21 days), grower (22-33 days), and finisher (34-42 days). Glutamine supplementation plans up to 21 days do not improve the performance of broilers in the periods from 1 to 21 and from 1 to 42 days of age reared in a high-temperature environment. Carcass yields and cuts of broilers at 42 days of age are not changed by glutamine supplementation for up to 21 days.

Realizou-se este estudo com o objetivo de avaliar planos de suplementação de glutamina para frangos de corte, de um a 42 dias de idade, criados em ambiente quente. Utilizou-se 690 pintainhos de corte machos da linhagem Cobb distribuídos em delineamento em blocos casualizados com cinco planos de suplementação de glutamina: 0 % de um a 42 dias de idade; 0,5 % de um a 7 dias e 0 % de 8 a 42 dias; 1,0 % de um a 7 dias e 0 % de 8 a 42 dias; 1,0 % de um a 7 dias, 0,5 % de 8 a 14 dias e 0 % de 15 a 42 dias; 1,0 % de um a 7 dias, 1,0 % de 8 a 14 dias, 0,5 % de 15 a 21 dias e 0 % de 22 a 42 dias e 6 repetições de 23 aves cada. Adotou-se o peso inicial das aves como critério de bloqueamento. Os dados obtidos foram submetidos à análise de covariância e quando ocorreram diferenças significativas as médias foram comparadas pelo teste de Tukey a 5 % de probabilidade. Constatou-se que as aves alimentadas com as dietas suplementadas com 1,0 % de glutamina de um a 14 dias e 0,5 % de glutamina de 14 a 21 dias apresentaram maior peso corporal final, ganho de peso e maiores pesos de carcaça, de peito e de dorso. Para aves criadas sob temperaturas elevadas, recomenda-se a suplementação de glutamina de 1,0 % de um a 14 dias e 0,5 % de 14 a 21 dias e 0 % de 22 a 42 dias de idade, a qual proporciona maior peso corporal, ganho de peso, pesos de carcaça e de peito e rendimento de carcaça.