Inclusion of kaolin in the diet of brown egg layers at the end of the production cycle/Caulim na alimentacao de poedeiras semipesadas ao final do ciclo produtivo
This study investigated the inclusion of kaolin levels in the diet of brown egg layers at the end of the production cycle. A completely randomized design involved the distribution of 288 brown egg layers into six treatments of eight replications, with six birds per replication. When the birds reache...
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Published in | Ciência rural Vol. 51; no. 11; p. 1 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Universidade Federal de Santa Maria
01.11.2021
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Online Access | Get full text |
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Summary: | This study investigated the inclusion of kaolin levels in the diet of brown egg layers at the end of the production cycle. A completely randomized design involved the distribution of 288 brown egg layers into six treatments of eight replications, with six birds per replication. When the birds reached the age of 63 weeks, the feeding of the experimental diets began. Diets differed by the inclusion of increasing levels of kaolin: Control (no additive), and the inclusion of 1%, 2%, 3%, 4%, and 5% kaolin. The performance, egg quality, intestinal morphometry, and excreta moisture were evaluated. The inclusion of kaolin promoted improvement in the jejunum villus height, enabling less feed intake; however, there were no significant differences in egg quality. The excreta moisture decreased linearly as the kaolin level in the diet increased. The inclusion of 5% kaolin in the diet of brown egg layers at the end of the production cycle improved intestinal morphometry and the quality of excreta through a reduction of moisture. Key words: clay, egg production, egg shell quality, poultry nutrition. O objetivo deste trabalho foi investigar a inclusao de niveis de caulim na dieta de poedeiras semipesadas ao final do ciclo de produgao. Foram utilizadas 288 galinhas semipesadas distribuidas em delineamento inteiramente casualizado com seis tratamentos de oito repetigoes, contendo seis aves por repetigao. Quando as aves atingiram a idade de 63 semanas, foi iniciada a alimentagao com as dietas experimentais. As dietas diferiam entre si pela inclusao de niveis crescentes de caulim: controle (sem aditivo); e a inclusao de 1, 2, 3, 4 e 5% de caulim na dieta. Foram avaliados o desempenho, a qualidade dos ovos, a morfologia intestinal e a umidade das excretas. A inclusao de caulim promoveu melhora na altura das vilosidades do jejuno, possibilitando menor consumo de ragao. Nao houve diferengas significativas para a qualidade dos ovos. A umidade das excretas diminuiu com o aumento do nivel de caulim na dieta, respondendo de forma linear. A inclusao de caulim ao nivel de 5% nas ragoes de poedeiras semipesadas ao final do ciclo de produgao melhorou a morfometria intestinal e a qualidade dos excrementos por meio da redugao de sua umidade. Palavras-chave: argila, produgao de ovos, qualidade da casca do ovo, nutrigao avicola. |
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ISSN: | 0103-8478 1678-4596 |
DOI: | 10.1590/0103-8478cr20200788 |