RESUMO

An experiment was carried out to evaluate the requirement of digestible methionine for growing pullets at growth phase (7 to 12 weeks of age). A completely randomized design was distributed in five treatments, six replicates, and 15 pullets per experimental unit. 450 Dekalb White pullets from the 7th weeks of age, with an average initial weight of 313.14 ± 12.49 g were used. Dietary treatments consisted in five diets supplemented with DL-Methionine which resulted in five levels of digestible methionine (0.266, 0.294, 0.322, 0.350, and 0.378 %). Performance, serological blood, histopathology and histomorphometry data were evaluated. Quadratic responses were observed for final live weight (p < 0.0143), weight gain (p < 0.0073), feed conversion ratio (p < 0.0058), glycogen deposition in the liver (p < 0.0001), gamma-glutamyl transferase enzyme activity (p < 0.0008), and villus height (p < 0.0024) with digestible dMet levels. In conclusion, the use of 0.343 % dMet, corresponding to a dMet:dLys ratio 55, is recommended for white-egg pullets from 7 to 12 weeks of age.

Assuntos

RESUMO

An experiment was carried out to evaluate the requirement of digestible methionine for growing pullets at growth phase (7 to 12 weeks of age). A completely randomized design was distributed in five treatments, six replicates, and 15 pullets per experimental unit. 450 Dekalb White pullets from the 7th weeks of age, with an average initial weight of 313.14 ± 12.49 g were used. Dietary treatments consisted in five diets supplemented with DL-Methionine which resulted in five levels of digestible methionine (0.266, 0.294, 0.322, 0.350, and 0.378 %). Performance, serological blood, histopathology and histomorphometry data were evaluated. Quadratic responses were observed for final live weight (p < 0.0143), weight gain (p < 0.0073), feed conversion ratio (p < 0.0058), glycogen deposition in the liver (p < 0.0001), gamma-glutamyl transferase enzyme activity (p < 0.0008), and villus height (p < 0.0024) with digestible dMet levels. In conclusion, the use of 0.343 % dMet, corresponding to a dMet:dLys ratio 55, is recommended for white-egg pullets from 7 to 12 weeks of age.(AU)

Assuntos

RESUMO

Todos os organismos vivos, tanto animais como vegetais, apresentam quantidades variáveis de minerais, que são necessários para manter seu metabolismo fisiológico, sendo esses nutrientes de grande importância para o desenvolvimento das espécies. Para poedeiras, o cálcio e o fósforo são minerais chaves para o crescimento e formação do ovo, e sua disponibilidade é mais crucial durante o período de postura, pois os dois estão envolvidos no processo de formação do ovo. Apesar da importância bioquímica, fisiológica e nutricional destes minerais pouco se conhece a respeito do seu processo de transporte intestinal. Portanto, considerando a importância do cálcio e fósforo na nutrição de poedeiras e a necessidade do desenvolvimento de estratégias que possibilitem seu melhor aproveitamento, objetivou-se com esta revisão descrever o funcionamento dos transportadores de cálcio e fósforo para aves de postura, bem como, os fatores nutricionais que interferem sobre os mesmos.(AU)

All living organisms, both animals and plants, have varying amounts of minerals, which are necessary to keep its physiological metabolism of these nutrients, are important for the development of species. For laying hens, calcium and phosphorus are key minerals for growth and egg formation, and its availability is more crucial during the laying period, because both are involved in egg formation process. Despite the biochemical, physiological and nutritional importance of these minerals little is known about the process of intestinal transport. Therefore, considering the importance of calcium and phosphorus in the nutrition of hens and the need to develop strategies that enable their better utilization, aimed with this review describe the operation of carriers calcium and phosphorus for laying hens, as well as the nutritional factors that interfere with about the same.(AU)

Assuntos

RESUMO

Todos os organismos vivos, tanto animais como vegetais, apresentam quantidades variáveis de minerais, que são necessários para manter seu metabolismo fisiológico, sendo esses nutrientes de grande importância para o desenvolvimento das espécies. Para poedeiras, o cálcio e o fósforo são minerais chaves para o crescimento e formação do ovo, e sua disponibilidade é mais crucial durante o período de postura, pois os dois estão envolvidos no processo de formação do ovo. Apesar da importância bioquímica, fisiológica e nutricional destes minerais pouco se conhece a respeito do seu processo de transporte intestinal. Portanto, considerando a importância do cálcio e fósforo na nutrição de poedeiras e a necessidade do desenvolvimento de estratégias que possibilitem seu melhor aproveitamento, objetivou-se com esta revisão descrever o funcionamento dos transportadores de cálcio e fósforo para aves de postura, bem como, os fatores nutricionais que interferem sobre os mesmos.

All living organisms, both animals and plants, have varying amounts of minerals, which are necessary to keep its physiological metabolism of these nutrients, are important for the development of species. For laying hens, calcium and phosphorus are key minerals for growth and egg formation, and its availability is more crucial during the laying period, because both are involved in egg formation process. Despite the biochemical, physiological and nutritional importance of these minerals little is known about the process of intestinal transport. Therefore, considering the importance of calcium and phosphorus in the nutrition of hens and the need to develop strategies that enable their better utilization, aimed with this review describe the operation of carriers calcium and phosphorus for laying hens, as well as the nutritional factors that interfere with about the same.

Assuntos