Handbook of Poultry Feed from Waste

Boushy, A. R. Y. El; Poel, A.F.B. van der

doi:10.1007/978-94-017-1750-2

Cited by 33 publications

(24 citation statements)

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“…Keratin hydrolysates are widely used in protein feed supplements [18]. Feather waste, for example, is hydrolysed with saturated steam under high pressure (sometimes with the addition of lime) to produce feather meal, which is used as a feed supplement [148]. These conditions lead to the loss or modification of some of the amino acids, which impacts the nutritional value and digestibility of the feather meal.…”

Section: Potential Applications Of Keratinasesmentioning

confidence: 99%

Challenges and Opportunities in Identifying and Characterising Keratinases for Value-Added Peptide Production

et al. 2020

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Keratins are important structural proteins produced by mammals, birds and reptiles. Keratins usually act as a protective barrier or a mechanical support. Millions of tonnes of keratin wastes and low value co-products are generated every year in the poultry, meat processing, leather and wool industries. Keratinases are proteases able to breakdown keratin providing a unique opportunity of hydrolysing keratin materials like mammalian hair, wool and feathers under mild conditions. These mild conditions ameliorate the problem of unwanted amino acid modification that usually occurs with thermochemical alternatives. Keratinase hydrolysis addresses the waste problem by producing valuable peptide mixes. Identifying keratinases is an inherent problem associated with the search for new enzymes due to the challenge of predicting protease substrate specificity. Here, we present a comprehensive review of twenty sequenced peptidases with keratinolytic activity from the serine protease and metalloprotease families. The review compares their biochemical activities and highlights the difficulties associated with the interpretation of these data. Potential applications of keratinases and keratin hydrolysates generated with these enzymes are also discussed. The review concludes with a critical discussion of the need for standardized assays and increased number of sequenced keratinases, which would allow a meaningful comparison of the biochemical traits, phylogeny and keratinase sequences. This deeper understanding would facilitate the search of the vast peptidase family sequence space for novel keratinases with industrial potential.Catalysts 2020, 10, 184 2 of 23 with keratinolytic activity for keratin hydrolysis protects the integrity of the keratin amino acids in most cases and allows control over the peptide size in the hydrolysate that is not readily achievable with other methods [5]. This degree of control allows the production of bespoke medical biomaterials, smart biocomposites, protein feed supplements with enhanced nutritional and bioactive properties as well as personal care products with enhanced functional and bioactive properties.Identifying peptidases with keratinolytic activity is an inherent problem associated with the search for new enzymes. Keratinase activity however appears to be dependent on the accessibility of the keratin substrate to the enzyme [6,7]. Thermochemical or biochemical treatment of the keratin, with emphasis on the reduction of the disulphide bond and disruption of other important bonds involved in the structural stability of keratin like isopeptide, hydrogen and glycolytic bonds [6,[8][9][10], appears to be the prerequisite for enzymatic hydrolysis. Sulphitolysis, which involves reduction of the disulphide bond in keratin, often acts synergistically with keratinases in nature [6,7]. Although destabilization of the keratin structure is a prerequisite for keratin hydrolysis, not all peptidases can hydrolyse keratin. Peptidases like trypsin, papain and pepsin cannot hydrolyse keratin as efficiently ...

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Section: Potential Applications Of Keratinasesmentioning

confidence: 99%

Challenges and Opportunities in Identifying and Characterising Keratinases for Value-Added Peptide Production

et al. 2020

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“…We did the drying process manually to reduce the water content of the layer manure chicken, and to reduce the odor from the layer manure chicken. Boushy and Poel (2000) found that a high moisture content on the manure layer (75-80%) was possibly due to the contamination with pathogen microorganism.…”

Section: Crude Protein Content On Dried Of Poultry Waste Urea-molassementioning

confidence: 99%

“…Wayne et al (2003) stated that crude fiber would stimulate the process of rumination and rumen contractions, which in turn would improve the fermentation process of the fiber. The main result of the fermentation of fibrous carbohydrates was acetic acid (Boushy and Poel, 2000). However, the crude fiber content can be a limiting factor for feed consumption.…”

Section: Crude Fiber Content On Dried Of Poultry Waste-urea Molasses mentioning

confidence: 99%

“…Crude fiber will stay longer in the rumen and can suppress the feed consumption (Mubi et al, 2013). Boushy and Poel (2000) stated crude fiber was also an indicator of the low digestibility of feed material. The digestibility of crude fiber depends on its content in the formulations.…”

Section: Crude Fiber Content On Dried Of Poultry Waste-urea Molasses mentioning

confidence: 99%

“…The urea NPN in layer chicken manure could be used as animal feed (Vatta et al, 2007). Boushy and Poel (2000) stated, however, layer manure chicken consists of a pathogenic microorganism. Therefore past study suggested the utilization of the low content of essential amino acid and metabolic energy from the manure was less than 5% of the total ration (Sinaga and Silalahi, 2012).…”

Section: Introductionmentioning

confidence: 99%

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A study: nutrient content evaluation of dried poultry waste urea molasses block (dpw-umb) on proximate analysis

Adli

Sjofjan

Mashudi

2018

JIIP

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The research evaluated the nutrient content of dried poultry waste urea-molasses block (DPW-UMB). The use of dried poultry waste in the manufacture of the urea-molasses block was as a substitution of urea and could improve the value added in dry season. The treatments used for research were T1 (10% manure of laying chicken and 25% molasses), T2 (15% manure of laying chicken and 30% molasses), and T3 (20% manure of laying chicken and 30% molasses). Chemical analysis: the dried poultry waste were analyzed for dry matter, crude protein, crude fiber, ash, fat, and gross energy. The statically formulation diet composed with Microsoft Excel Ver. 2016. The results showed that the 20% manure layer chicken and 30% molasses T3 were better than T2 and T1 on nutrient content. The study concludes that DPW-UMB T3 are dried poultry waste containing sufficient levels of gross energy, crude protein, crude fiber, ash, and fat it could be used as feedstuff for ruminants for supplementation with the required nutrients.

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Growth, carcass, digestive enzymes, intestinal microbiota and economics in growing Egyptian geese as affected by dietary fiber and fat levels

El‐Hack

El-Kholy

Ashour

et al. 2022

Rend. Fis. Acc. Lincei

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Handbook of Poultry Feed from Waste

Cited by 33 publications

References 0 publications

Challenges and Opportunities in Identifying and Characterising Keratinases for Value-Added Peptide Production

Challenges and Opportunities in Identifying and Characterising Keratinases for Value-Added Peptide Production

A study: nutrient content evaluation of dried poultry waste urea molasses block (dpw-umb) on proximate analysis

Growth, carcass, digestive enzymes, intestinal microbiota and economics in growing Egyptian geese as affected by dietary fiber and fat levels

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