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Economics of Low Protein Broiler Diets: A Formulation Exercise

Published: February 25, 2021
By: R.A. SWICK 1 and D.C. CRESWELL 2. / 1 University of New England, Armidale NSW, Australia; 2 Creswell Nutrition, Mosman NSW, Australia.
Summary

This paper investigates the costs of wheat-based broiler diets with twenty g/kg lower protein than current through a formulation exercise. In the context of this exercise, this means protein of 187, 176 and 170 g/kg for grower, finisher 1 and finisher 2, respectively. Current prices of valine, arginine and isoleucine would allow these lower protein diets to be formulated at $10-12/t higher priced than their unrestricted protein comparisons. It was found that valine, arginine and isoleucine prices would need to be reduced by around 50% to be able to formulate these lower protein diets at costs similar to the high protein ones. The effects of formulating and producing lower protein diets would mean large increases in lysine, methionine and threonine usage; the use of valine, arginine and isoleucine, higher levels of wheat, lower levels of added oil, and lower levels of soybean meal. It is suggested that at some point commercial broiler companies may try these lower protein diets to investigate potential benefits on performance, litter quality and odour remediation, starting with finisher 2.

I. INTRODUCTION
Papers have been presented at the past two APSS meetings on the subject of low protein diets (Kidd and Choct, 2017; Hilliar and Swick, 2018; Lambert and Corrent, 2018). Few, if any, have taken note of the economics of such diets. This paper is an examination of the costs of low protein diets. A brief history of amino acids is worth reviewing. Each time a limiting amino acid became available commercially, and was used, the protein level of broiler diets was reduced. Methionine and its hydroxy analogue were the first amino acid sources to be made commercially available in the late 1950’s (Gordon and Sizer, 1955). If broiler diets are formulated with the methionine and methionine + cysteine requirements used today, but without D,L-methionine, it would result in protein levels of about 28%! Lysine became commercially available in the 1960s (Waldroup and Harms, 1963) and threonine in the 1980s (Edmonds et al., 1985). In the 2000s valine, arginine and isoleucine became commercially available. However due to cost, only small amounts are used. Benefits for lower protein diets are suggested as reduced water consumption, drier litter, better foot pad health, environmental benefits and improved FCR (Garland, 2018) and lower odour production (Sharma et al., 2016). Excess protein may be associated with necrotic enteritis (Drew et al., 2004).
Each time a new amino acid became available and was used, the level of soybean meal has been reduced. Essentially, what is happening is that soybean meal is replaced with amino acids. This will continue to be the case when we find ways to use valine, arginine and isoleucine. This exercise has been done with wheat-based diets for Australia. If this exercise was done in the USA or other locations using corn-soy diets, the numbers would be quite different, but the conclusions would probably be similar. Which amino acids are available? The amino acids LMT (lysine, methionine and threonine) are widely used in Australian broiler diets. They are priced in the range of $2-4/kg. Small amounts of valine and glycine are also being used. Demand for valine in the market has increased since June 2018. Other amino acids that are available but not widely used in broiler diets due to price are valine, arginine and isoleucine (VAI). Prices used for these amino acids in this exercise are $8.5, 13.3 and 18.9/kg respectively.
These are prices in the Australian marketplace over the past 12 months. Tryptophan does not appear to be limiting in wheat-based diets, and as such is not considered in this exercise. However, in corn-based diets seeking a 30 g/kg reduction in protein, crystalline tryptophan would be required. There is a reasonable knowledge of the absolute requirements for lysine, methionine, methionine + cysteine, tryptophan, threonine, arginine, isoleucine and valine. Requirements for amino acids other than lysine are normally calculated based on the ideal protein ratio (Baker and Han, 1994). For this exercise, the 2018 recommendations for Cobb 500 have been used. The requirement for the “non-essential” amino acid glycine is not clear. Requirements for glycine and glycine + serine are not well understood. Several researchers have shown improvements in broiler performance with added glycine in lower protein diets not containing meat and bone meal (MBM) (Hilliar et al., 2017; Dean et al., 2006). MBM is high in glycine, and it is unlikely that diets containing MBM would need added glycine. Should MBM not be used, the inclusion of 500 grams- 1 kg glycine/t might be advisable. At less than $3/kg, this would not be expensive.
II. FORMULATION EXERCISE
A least cost formulation exercise was conducted, using wheat-based diets, with MBM, canola meal and soybean meal as the protein sources, and tallow as the supplemental oil. Ingredient prices (AUD) for June 2018, for Eastern Australia were used. Xylanase and phytase enzymes were used with recommended nutrient matrices. Formulations are based on Cobb 500 recommendations for SID amino acids (Cobb-Vantress 2018). Diets are shown in Table 1. The starter diet was not included in this exercise since this diet makes up only about 10% of total feed used. The starter diet may be a special case where increased levels of high quality protein may be advantageous to growth and have little potential issues on litter quality, health, odour production and/or economics.
AUSTRALIA - ECONOMICS OF LOW PROTEIN BROILER DIETS: A FORMULATION EXERCISE - Image 1
The formulations were established without any protein restrictions. Note the protein levels are 207, 196 and 190 g/kg respectively as shown in Table 2. Then protein was restricted by 20 g/kg, to 187, 176 and 170 g/kg in grower, finisher 1 and finisher 2 respectively. Protein restriction was achieved by placing a number in the “protein maximum” column in the formulation program, for example 187 g/kg for the grower diet. Formulations were done by 3 methods: 1) No protein restrictions, 2) Protein restricted to 20 g/kg lower than 1. 3) Protein restricted as in method 2, but with prices of arginine, valine and isoleucine reduced by 50%.
III. RESULTS
Results of the formulation exercise are shown in Table 2 and summarised in Table 3. Grower diets are $468.63/t without protein restriction, $480.99/t with protein restriction and current VAI prices, and $467.10/t with VAI at 50% of current prices. Finisher 1 diets are $450.17/t without protein restriction, $462.03/t with protein restriction and current VAI prices, and $448.43/t with protein restriction and VAI at 50% of current prices. Finisher 2 diets are $441.63/t without protein restriction, $451.80/t with protein restriction and current VAI prices, and $439.21/t with protein restriction and VAI at 50% of current prices. This suggests the protein reduced diets will cost $10-12/t more with current VAI prices. Costs of VAI would need to come down by 50% of current prices, for the lower protein diets to be of equal price to the higher protein ones.
AUSTRALIA - ECONOMICS OF LOW PROTEIN BROILER DIETS: A FORMULATION EXERCISE - Image 2
 
AUSTRALIA - ECONOMICS OF LOW PROTEIN BROILER DIETS: A FORMULATION EXERCISE - Image 3
There are significant ingredient effects of these low protein diets. These are: 1) wheat levels are increased, 2) soybean meal levels are decreased, 3) levels of canola meal are unchanged, 4) added oil (tallow) levels are reduced by almost 50%, 4) MBM remains about the same, 5) amounts of lysine, methionine and threonine are greatly increased. On average of grower, finisher 1 and finisher 2, lysine addition is increased by 60%, methionine by 25% and threonine by almost 300%, 5) valine, arginine and isoleucine are used in these lower protein diets, at levels of 0.2-0.7 kg/t for valine, 1.2-1.6 kg/t for arginine, and 0.1-0.6 kg/t for isoleucine. Arginine is used at the highest level.
IV. DISCUSSION
It is clear that, if lower protein diets are to be produced, the amino acids valine, arginine and isoleucine will be needed. As shown in this exercise, current prices of these 3 amino acids prevent the formulation of lower protein diets at equal cost to higher protein ones. Therefore, the key to lower protein diets is dependent on future prices for these 3 amino acids.
Abstract presented at the 30th Annual Australian Poultry Science Symposium 2019. For information on the latest edition and future events, check out https://www.apss2021.com.au/.

Baker D & Han Y (1994) Poultry Science 73: 1441-1447.

Cobb 500 Broiler Performance and Nutrition Supplement (2018) Cobb-Vantress L-2114-08 EN: April 2018.

Dean DW, Binder TD & Southern LL (2006) Poultry Science 85: 288-296.

Drew MD, Syed NA, Goldale BG, Laarveld B & van Kessel AG (2004) Poultry Science 83: 414-420.

Edmonds MS, Parsons CM & Baker DH (1985) Poultry Science 64: 1519-1526.

Garland PW (2018) Proceedings of the Australian Poultry Science Symposium 29: 1-7.

Gordon RS & Sizer IW (1955) Poultry Science 122: 1270-1271.

Hilliar M & Swick RA (2018) Proceedings of the Australian Poultry Science Symposium 29: 8-11.

Hilliar M, Morgan N, Hargreave G, Barekatain R, Wu S & Swick RA (2017) Proceedings of the Australian Poultry Science Symposium 28: 158.

Kidd MT & Choct M (2017) Proceedings of the Australian Poultry Science Symposium 28: 175.

Lambert W & Corrent E (2018) Proceedings of the Australian Poultry Science Symposium 29: 20-27.

Sharma NK, Choct M, Dunlop MW, Wu SB, Castada H & Swick RA (2016) Poultry Science 96: 851-860.

Waldroup PW & Harms RH (1963) Poultry Science 42: 652-657.

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Authors:
Robert Swick
University of New England
University of New England
David Creswell
Influencers who recommended :
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Robert Swick
University of New England
University of New England
2 de mayo de 2021

The prices are a moving target. But yes that paper is AUD not Euros.
We can say that as time goes by, the purified AA sources will likely get cheaper as demand picks up and economy of scale is realised. The next thing to be considered will be sustainability.
On first thought, most will think purified sources will be more sustainable than SBM. However one needs to consider the input materials to produce purified AA sources including water, starch, sugar, nitrogen and electricity for maintaining fermentation temperature and drying the final product. Methionine is truly synthetic being made from petroleum derived chemicals methyl mercaptan, acrolein and hydrogen cyanide (and petroleum is not very sustainable).
Soybeans are grown on farms using varying degrees of sustainable practices. But they do employ rural people and put more nitrogen into the soil than they take away. The amino acids produced by soybeans use nitrogen fixed from the air. When produced in situations where they do not impact important natural habitats they are truly a highly sustainable miracle crop.

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Dr. Behnam Saremi
CJ Bio
19 de marzo de 2021
What's up in AU? Val, Arg and Ile prices in Europe are half of these prices and for some even less than half.
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Robert Swick
University of New England
University of New England
7 de marzo de 2021
Great point!
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Juarez Donzele
Universidade Federal de Viçosa - UFV
Universidade Federal de Viçosa - UFV
7 de marzo de 2021
Robert Swick Although their considerations are consistent, it must be considered, that in addition to our previous considerations, that the health challenge, mentioned above, constitutes one of the factors, which can compromise the performance of the birds, when the crude protein is reduced. This is due to the fact that the health challenge increases the demand for amino acids considered as non-essential, including glutamine, glutamate and glycine, whose concentrations are reduced. Even due to this fact these amino acids are considered conditionally essential.
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Juarez Donzele
Universidade Federal de Viçosa - UFV
Universidade Federal de Viçosa - UFV
2 de marzo de 2021

Robert Swick, consistent with the report by Mr George Entz, research work that we conducted with broiler chicken, the results of which are published here at ENGORMIX, under the title: Digestible lysine levels obtained by two methods of formulation of diets for 22- to-42-day-old broilers confirm that diets with a full protein level provide better performance results for broilers.

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Dimcho Djouvinov
AB Vista
1 de marzo de 2021
Dear Bob, Thanks for sharing this work. Did you apply in formulations all parameters of matrix of enzymes: minerals plus energy plus AAs? And when combining phytase with NSPase, using 80% of each matrix for AME and AAs?
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George Entz
1 de marzo de 2021
Good day, 100% correct. We have tried lower protein diets in Canada as well, but almost always, higher protein diets are more economical and the performance is better as well. And I've tried supplementing with synthetic VAI as well. What wasn't mention in the article was the protein level in the wheat used, as that makes a huge difference in the ability to lower protein levels and/or performance. The higher protein wheat (150 g/kg) along with lower protein in the diets will make for worse results then say using a wheat that has 105 g/kg. Thank-you for sharing your work.
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Adeniyi Patrick Fatoye
9 de junio de 2021
Low protein diet for broilers welcome.
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Siyanbola O.O
8 de junio de 2021
Yes! Anything that can reduce production cost significantly will be welcomed.
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Adeniyi Patrick Fatoye
16 de marzo de 2021
A low protein diet is not of benefits because of adverse effects on health of poultry birds.
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