Abstract
ABSTRACT A nitrogen balance test was performed to evaluate the individual responses of growing pigs to threonine intake. Eight commercial barrows were used (body weight ranging from 15 to 20 kg). A dose-response study was performed, in which the threonine supply increased in seven equidistant steps (the seven dietary threonine levels ranged from 50 to 120% of the requirements) every three days for each pig. The levels of all other amino acids were 20% higher than the tested amino acid. [...]
Highlights
Threonine is considered an essential amino acid (AA) and is commonly the second or third limiting AA in pig diets based on corn and soybean meal; it may be the first limiting AA when diets are supplemented with synthetic lysine (Saldana et al, 1994)
The group responses obtained by the NLMixed procedures are very similar to those estimated by the NLIN procedure
An increasing number of studies attempting to determine threonine requirements have been published (Rostagno et al, 2011; NRC, 2012) and the main methods applied are dose-response, which are based on the average response of the population, or factorial, which are based on the response of an average individual
Summary
Threonine is considered an essential amino acid (AA) and is commonly the second or third limiting AA in pig diets based on corn and soybean meal; it may be the first limiting AA when diets are supplemented with synthetic lysine (Saldana et al, 1994). An increasing number of studies attempting to determine threonine requirements have been published (Rostagno et al, 2011; NRC, 2012) and the main methods applied are dose-response, which are based on the average response of the population, or factorial, which are based on the response of an average individual These methods allow only a single nutrient level to be established and supplied to all animals in a given category for a long period and do not consider the dynamics of the requirements and the variability among individuals within a population (Hauschild et al, 2010). The variability among individuals within a population must be determined to optimize the biological, economic, and environmental responses and to establish more accurate nutritional programs
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