Nutrition

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Ideal Ratio of Threonine and Lysine for Growing and Finishing Pigs -Monograph

Posted in: Nutrition, Pork Insight Articles by PSCI on July 5, 2017


A majority of growth studies defining amino acid requirements have been undertaken using highly synthetic diets or diets based on com/soybean meal. Neutral detergent fibre (NDF) affects the endogenous nitrogen loss (ENL) of pigs. Specifically the loss of threonine (THR). Differences in the NDF content in corn (C) versus wheat (W) based diets should impact the amino acid requirement of the animal. The purpose of the experiments reported herein was to verify the ratio of apparent ileal digestible threonine to lysine (THR/LYS) to achieve maximum growth performance in gilts, of a defined strain, fed either W or C based diets.

Pigs fed C based diets had higher rates of gain, possibly due to the higher energy densities of the C based diets. As there was no difference in PD for pigs fed C vs W based diets it is likely that the difference is due to the higher rate of lipid deposition. At first these growth responses indicated that the levels of THR/LYS to achieve maximal growth differed between diets based on W and those based on C. For pigs grown from 20 to 45 kg BW the THR/LYS in the diets was between 55 and 59% for W based diets and between 57 and 63% for C based diets. There is a similar trend for a higher ratio to meet the requirement in W versus C based diets for pigs grown from 7 5 to I :20 kg BW.

Ideal Ratio of Threonine and Lysine for Growing and Finishing Pigs

 
 
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