Physico-chemical properties of late-incubation egg amniotic fluid and a potentialin ovofeed supplement.
OBJECTIVE
This study explored the physico-chemical properties of late-incubation egg amniotic fluid and a potentialin ovofeed (IOF) supplement.


METHODS
Amniotic fluid was collected from broiler breeders (Ross 308, 51 weeks and Cobb 500, 35 weeks) on day 17 after incubation. A mixture of high-quality soy protein supplement - Hamlet Protein AviStart (HPA) was serially diluted in MilliQ water to obtain solutions ranging from 150 to 9.375 mg/mL. The mixtures were heat-treated (0, 30, 60 minutes) in a waterbath (80°C) and then centrifuged to obtain supernatants. The amniotic fluid and HPA supernatants were analysed for their physico-chemical properties.


RESULTS
Only viscosity and K+were significantly (p<0.05) different in both strains. Of all essential amino acids, leucine and lysine were in the highest concentration in both strains. The osmolality, viscosity and pCO2of the supernatants decreased (p<0.05) with decreasing HPA concentration. Heat treatment significantly (p<0.05) affected osmolality, pH, and pCO2, of the supernatants. The interactions between HPA concentration and heat treatment were significant with regards to osmolality (p<0.01), pH (p<0.01), pCO2(p<0.05), glucose (p<0.05), lactate (p<0.01) and acid-base status (p<0.01) of HPA solutions. The Ca2+, K+, glucose, and lactate increased with increasing concentration of HPA solution. The protein content of HPA solutions decreased (p<0.05) with reduced HPA solution concentrations. The supernatant from 150 mg/mL HPA solution was richest in glutamic acid, aspartic acid, arginine and lysine. Amino acids concentrations were reduced (p<0.05) with each serial dilution but increased with longer heating.


CONCLUSIONS
The values obtained in the primary solution (highest concentration) are close to the profiles of high-protein ingredients. This supplement, as a solution, hence, may be suitable for use as an IOF supplement and should be tested for this potential.
School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.|Department of Animal Production, Kogi State University, PMB 1008, Anyigba, 272102, Kogi State, Nigeria.
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Omede
School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
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Bhuiyan
School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
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Lslam
School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
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Iji
Amino Acids; Amniotic Fluids; In ovo; Physico-chemical Properties; Protein