Abstract
In the process of natural selection and evolution of ruminants their diet was composed in its entirety by bulky foods containing low nutritive value with high NDF content. And because of the low selectivity gassing habit and its physiological adaptations, bovine has become one of the most efficient domestic ruminants in the use of foods with high NDF content and consequently the most demanding of this type of diet. The concentration of NDF is inversely proportional to the energy content of the diet, so several professionals have drastically reduced the NDF content to increase the energy content in the search for better performance of the animals, however, this may cause the opposite effect. In formulating diets for cattle, fiber requirements must be guaranteed, and contrary to what is not a simple task due to the influence of various chemical and physical factors inherent in the various types of feed used for these animals. The recommended minimum physically effective fiber limit is 21%.
Highlights
In the process of natural selection and evolution of ruminants their diet was composed in its entirety by bulky foods containing low nutritive value with high NDF content
The concentration of NDF is inversely proportional to the energy content of the diet, so several professionals have drastically reduced the NDF content to increase the energy content in the search for better performance of the animals, this may cause the opposite effect
In formulating diets for cattle, fiber requirements must be guaranteed, and contrary to what is not a simple task due to the influence of various chemical and physical factors inherent in the various types of feed used for these animals
Summary
Resumo: No processo de seleção natural e evolução dos ruminantes suas dietas eram compostas em sua totalidade por alimentos volumosos, contendo baixo valor nutritivo com elevado teor de FDN. E devido ao hábito pastejador de baixa seletividade e suas adaptações fisiológicas o bovino se tornou dentre os ruminantes domésticos, o mais eficiente na utilização de alimentos com elevado teor de FDN, e consequentemente o mais exigente quanto a esse tipo de dieta. Na formulação de dietas para bovinos deve-se garantir as exigências em fibra, e ao contrário do que se parece não é tarefa tão simples devido à influência de vários fatores químicos e físicos inerentes aos vários tipos de alimentos utilizados para esses animais.
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