Nilva Kazue Sakomura

IntroductionThe concept of maintenance has been defined as the state of balance between the intake of nutrients and their inevitable losses (Siqueira et al., 2011; Silva et al., 2014; Soares et al., 2019). That contributes to an understanding of the differences in responses between individuals of a population and enhances the requirements concept. Different methodologies have been developed to est ...

1 INTRODUCTIONDuring the last decades, the productivity of laying hens has improved significantly, with higher number of eggs produced over the laying cycle and higher efficiency to utilize feed nutrients. This increase in productivity implies in a change in the requirements, and consequently, these hens become more demanding in nutrients, mainly amino acids (Elliot, 2008). Optimization of protein ...

INTRODUCTIONCorn and soybean meal are ingredients that have a good digestibility, however depending on the storage, crop and variety, these ingredients may have a change in their nutritional quality. For broilers, these ingredients constitute around 70 and 30% of the diet, respectively. Thus, any small improvement in their quality significantly influences the performance of the broiler chickens an ...

IntroductionOver the years, nutritionists have studied several ways to determine the ideal dietary supply of essential amino acids to optimize poultry performance. However, considering only performance objectives without taking into account economic factors may not reflect maximum profitability, since optimizing performance is not always viable (Pack et al., 2003). An economic approach to determin ...

IntroductionThe high cost of inorganic phosphate has influenced the direction of research and the industry to discover alternative sources of phosphorus (P) or improve the availability of P, for broilers. The phytase enzyme has been highlighted in the nutrition of non-ruminants as a tool to reduce the dietary inclusion of inorganic P and to decrease nutrient excretion through the excreta (WALDROUP ...

INTRODUCTION Temperature is the most important environmental factor in animal production and directly affects animal responses. Domestic birds are homeotherm animals and therefore must expend energy to maintain body temperature, in order to have adequate biochemical, physiological and behavioral responses (Al-Saffar, 2002). At high temperatures, the feather coverage is one of the factors that impa ...

IntroductionBroiler diets are commonly supplemented with dry DL-methionine (DL-Met; 99% active substance), liquid methionine hydroxy analogue-free acid (MHA-FA, 88% active substance) or dry methionine hydroxy analogue-calcium salt (MHA-Ca, 84% active substance). Several broiler trials have demonstrated that the relative bioavailability (RBA) of Met hydroxy analogue products (MHA-FA or MHA-Ca) ...