The aim of this experiment was to study the effects of dietary supplementation of mannan oligosaccharides （MOS）, extracted from yeast Saccharomyces cerevisiae and acidifier calcium formate （CF） on some performance...The aim of this experiment was to study the effects of dietary supplementation of mannan oligosaccharides （MOS）, extracted from yeast Saccharomyces cerevisiae and acidifier calcium formate （CF） on some performance parameters and egg quality characteristics of Japanese quail （Coturnixjaponica）. During the experimental period, which lasted 90 days, one hundred eighty three, 42-day-old quail, were distributed into 4 groups of 3 replications each and were placed in separate wire suspended cages. The birds of control group received a commercial feed, while the birds of the other 3 groups received the same feed, to which either 6 g CF kg^-1 or 1 g MOS kg^-1 or both 6 g CF kg^-1 plus 1 g MOS kg^-1 were added. The live weight, feed consumption, feed conversion ratio and mortality of birds were not significantly affected. The addition of MOS in the feed significantly （P 〈 0.05） increased palmitic acid percentage of egg yolk. Also, the addition of CF significantly （P 〈 0.05） decreased egg shape index and palmitic acid percentage of egg yolk. Furthermore, significant （P 〈 0.05） interaction between MOS and CF was observed on palmitic acid percentage, egg shape index and egg shell thickness. No significant effect was observed for egg： weight, specific weight, parts percentage （yolk, albumen, shell）, shell deformation, yolk diameter and yolk colour （L＊a＊b＊ colour space）.展开更多
This study investigated a combined low-thermal and CaO_(2)pretreatment to enhance the volatile fatty acid(VFA)production from waste activated sludge(WAS).The fermentative product was added to a sequencing batch reacto...This study investigated a combined low-thermal and CaO_(2)pretreatment to enhance the volatile fatty acid(VFA)production from waste activated sludge(WAS).The fermentative product was added to a sequencing batch reactor(SBR)as an external carbon source to enhance nitrogen removal.The results showed that the combined pretreatment improved WAS solubilization,releasing more biodegradable substrates,such as proteins and polysaccharides,from TB-EPS to LB-EPS and S-EPS.The maximum VFA production of 3529±188 mg COD/L was obtained in the combined pretreatment(0.2 g CaO_(2)/g VS+70℃for 60 min),which was 2.1 and 1.4-fold of that obtained from the sole low-thermal pretreatment and the control test,respectively.Consequently,when the fermentative liquid was added as an external denitrification carbon source,the effluent total nitrogen decreased to Class A of the discharge standard for pollutants in rural wastewater treatment plants in most areas of China.展开更多
文摘The aim of this experiment was to study the effects of dietary supplementation of mannan oligosaccharides （MOS）, extracted from yeast Saccharomyces cerevisiae and acidifier calcium formate （CF） on some performance parameters and egg quality characteristics of Japanese quail （Coturnixjaponica）. During the experimental period, which lasted 90 days, one hundred eighty three, 42-day-old quail, were distributed into 4 groups of 3 replications each and were placed in separate wire suspended cages. The birds of control group received a commercial feed, while the birds of the other 3 groups received the same feed, to which either 6 g CF kg^-1 or 1 g MOS kg^-1 or both 6 g CF kg^-1 plus 1 g MOS kg^-1 were added. The live weight, feed consumption, feed conversion ratio and mortality of birds were not significantly affected. The addition of MOS in the feed significantly （P 〈 0.05） increased palmitic acid percentage of egg yolk. Also, the addition of CF significantly （P 〈 0.05） decreased egg shape index and palmitic acid percentage of egg yolk. Furthermore, significant （P 〈 0.05） interaction between MOS and CF was observed on palmitic acid percentage, egg shape index and egg shell thickness. No significant effect was observed for egg： weight, specific weight, parts percentage （yolk, albumen, shell）, shell deformation, yolk diameter and yolk colour （L＊a＊b＊ colour space）.
基金supported by the Major Science and Technology Program for Water Pollution Control and Treatment(No.2018ZX07110-002)。
文摘This study investigated a combined low-thermal and CaO_(2)pretreatment to enhance the volatile fatty acid(VFA)production from waste activated sludge(WAS).The fermentative product was added to a sequencing batch reactor(SBR)as an external carbon source to enhance nitrogen removal.The results showed that the combined pretreatment improved WAS solubilization,releasing more biodegradable substrates,such as proteins and polysaccharides,from TB-EPS to LB-EPS and S-EPS.The maximum VFA production of 3529±188 mg COD/L was obtained in the combined pretreatment(0.2 g CaO_(2)/g VS+70℃for 60 min),which was 2.1 and 1.4-fold of that obtained from the sole low-thermal pretreatment and the control test,respectively.Consequently,when the fermentative liquid was added as an external denitrification carbon source,the effluent total nitrogen decreased to Class A of the discharge standard for pollutants in rural wastewater treatment plants in most areas of China.
