Piglet performance is not affected by low CP diets balanced in AA
A recent study performed at Wageningen University & Research evaluated the effect of reducing dietary CP in piglets from weaning to day 28 after weaning (8 to 25 kg). In this example, dietary CP level was reduced from 17.0 to 15.5% and inclusion of the full range of available AA (including L-Ile, L-Leu and L-His) was needed to ensure optimal supply (1.1% SID Lys and 10.5 MJ NE/kg). Dietary CP reduction was achieved by substituting soybean meal with barley and feed-grade AA. The recalculated undigestible CP intake was significantly decreased from 14 to 13.2 g/d (P < 0.001). The diet with a reduced CP level by 1.5% points supplemented
with the newly available AA resulted in the same growth performance as the control treatment. Moreover, the reduction of undigestible CP intake translated into decreased ammonia (-7%) and amine (-5%) concentrations as well as inflammation (-16%) in the gut based on the equations from Luise et al. (2021).
Practical implementation of low CP diets with optimized performance
Increasing knowledge on AA requirements have supported the reduction of dietary CP in piglet diets over the past 15 years. A new step in dietary CP reduction requires us to reconsider the way we address AA nutrition in diet formulation. The context of formulation, the targeted production criteria to optimize, the interactions between AA, the fact that several AA become limiting at the same time, their
functional roles, are examples among others of the need to apply an agile AA nutrition. This approach developed by AANE highlights the possibility to implement tailored feeding practices in piglets by applying different AA levels in feed optimization depending on the specific context (nutritional values, feedstuffs…) and the technical-economic objectives. The practical implementation of low CP strategy using the new AANE customized AA-based approach resulted in a reduction of the piglets fecal score even stronger than in our meta-analysis (Figure 1: customer trials from France and the Netherlands).
Conclusions As dietary CP level in animal feeds is further reduced, it is crucial to have a good understanding of the mode of action and the effects of low CP diets on animal health and welfare. When formulated with newly available AA from AANE (L-Val, L-Ile, L-Leu, L-His), low CP diets allow us to maintain performance and reduce piglet PWD. Amino acids are not only building blocks for growth, but they also take on functionalities for the intestinal integrity, immunity, and metabolism, that are currently being explored. An agile AA nutrition allows us to implement efficient nutritional strategies adapted to tackle multiple problems in specific contexts. This will help to achieve a sustainable animal production from performance, health, welfare, and environmental points of view.
References available on request from:
Claassen_Herman@eli.ajinomoto.com
Figure 1. Meta-analysis of the effect of dietary crude protein reduction on fecal score in piglets (Luise et al., 2021) and comparison with practical implementation at commercial farm level (Ajinomoto Animal Nutrition Europe internal data, 2020)
FEED COMPOUNDER MARCH/APRIL 2021 PAGE 39
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