Resumo
This study evaluated the effects of chromium yeast (Cr yeast) and two apparent metabolizable energy (AME) levels on productive performance, egg quality, and lipid and carbohydrate metabolism in laying hens. A total of 192 Bovans White laying hens at 47 weeks of age were randomly assigned to eight dietary treatments (six replicates each) in a 4 × 2 factorial arrangement: four levels of supplemental Cr (0, 0.2, 0.4, and 0.8 ppm as Cr yeast) and two AME levels (2,780 and 2,900 kcal AME kg−1). No significant effect of Cr yeast supplementation on feed intake, egg weight, egg production, intact eggs, egg mass, feed conversion ratio, or egg quality was observed. Egg quality parameters and Cr content in the yolk were not affected by dietary treatments. Plasma glucose and lipid levels were not influenced by either Cr yeast or AME levels used in this study. However, Cr yeast supplementation improved yolk percentage and hepatic glycogen content. The inclusion of Cr yeast at 0.2 and 0.4 ppm induced the highest hepatic glycogen content with the energy levels 2,900 and 2,780 kcal AME kg−1, respectively. Laying hens fed 2,900 kcal AME kg−1 showed the highest abdominal fat. The results observed in the present study support the hypothesis that the lack of positive effects of Cr yeast supplementation on production performance and egg quality may be related to good management practices, as the birds were not subjected to stressful conditions.
Assuntos
Animais , Leveduras , Galinhas/sangue , Compostos de Cromo/administração & dosagem , Ovos/análise , Metabolismo dos Lipídeos , Suplementos Nutricionais/análiseResumo
O objetivo deste trabalho foi acompanhar o crescimento de um filhote macho de Dasypus novemcinctus nascido em 10 de outubro de 2017 no Instituto Lauro de Souza Lima. Entre 15 dias e 200 dias de vida, foram realizadas pesagens e medições do animal a cada 15 dias. Entre 230 e 390 dias de vida, foram realizadas mais três pesagens e medições. Avaliou-se o ganho de peso e o crescimento do filhote. O filhote apresentou um desenvolvimento corporal linear e um ganho de peso adequado, em todo o período avaliado, exceto pelo período mais frio do ano, considerando os cuidados básicos e alimentação oferecidos, correspondendo às expectativas de crescimento da espécie.
This work aimed to follow the growth of a male Dasypus novemcinctus born October 10, 2017 at the "Lauro de Souza Lima" Institute. Between 15 days and 200 days of life, the animal was weighed and measured fortnightly. Between 230 and 390 days of life, three more weighing and measurements were performed. The pup presented a linear body development and an adequate weight gain, throughout the evaluated period, except for the coldest period of the year, considering the basic care and feeding offered, corresponding to the growth expectations of the species.
El objetivo de este trabajo fue acompañar el desarrollo corporal de una cría macho de Dasypus novencinctus nacido el 10 de octubre de 2017 en el Instituto "Lauro de Souza Lima". Entre 15 días y 200 días de vida, se realizaron pesajes y mediciones del animal cada 15 días. Entre 230 y 390 días de vida, se realizaron otros tres pesajes y mediciones. Se evaluaron ganancia de peso y crecimiento del armadillo. La cría del armadillo presentó un desarrollo corporal lineal y una ganancia de peso adecuada, en todo el período evaluado, excepto por el período más frío del año, considerando los cuidados básicos y alimentación ofrecidos, correspondiendo a las expectativas de crecimiento de la especie.