This study aimed to elucidate the effect of a pellet feed containing fermented proteins on pond-raised Chinese mitten crabs,Eriocheir sinensis in a 7-month crab feeding experiment in Gucheng Lake,Jiangsu province,Chin...This study aimed to elucidate the effect of a pellet feed containing fermented proteins on pond-raised Chinese mitten crabs,Eriocheir sinensis in a 7-month crab feeding experiment in Gucheng Lake,Jiangsu province,China.The results showed that fermented protein could significantly increase mean weight gain,crab size and total yield compared with control group.Moreover,the mean weight of male crabs and the number of large-sized male crabs improved over those of the control group.However,feed efficiency ratio did not differ significantly between the two groups.The amino acid content in the muscles of the female crabs of both the groups was higher than that in the muscles of the male crabs.The present study suggests that fermented compound protein may be one kind of potential protein sources for E.sinensis.展开更多
Background：Algae are widely recognized for their high oil content and for exponentially accumulating biomass with particular potential to provide single cell protein for human consumption or animal feed.It is believe...Background：Algae are widely recognized for their high oil content and for exponentially accumulating biomass with particular potential to provide single cell protein for human consumption or animal feed.It is believed that along with biodiesel from algae,the high protein de-oiled algal residue may become an alternative feed supplement option in the future.This study was conducted to investigate de-oiled algal residue obtained from the common Chlorella species,Thalassiosira weissflogii,Selenarstrum capricornutum,Scenedesmus sp.,and Scenedesmus dimorphus for assessment as potential feed supplements for ruminants by comparing with soybean（Glycine max） meal and alfalfa（Medicago sativa） hay.Results：With the exception of T.weissflogii,algal residue had higher concentrations of Cu,Zn,and Mn and lower concentration of Ca,Mg,and K than soybean meal and alfalfa hay.The algal residue CP（crude protein）concentrations ranged from 140 to 445 g/kg DM and varied among the de-oiled residues.In vitro rumen fermentation gas accumulation curves indicated that algal biomass degradation potential was less than that of soybean meal or alfalfa hay by up to 41.7%.The gas production curve,interpreted with a dual pool logistic model,confirmed that the fraction sizes for fast fermenting and slow fermenting of de-oiled algal residues were smaller than those in soybean meal and alfalfa hay,and the fermenting rate of the fractions was also low.Conclusions：Inferior in vitro rumen gas accumulation from the five de-oiled algal residues suggests that these algal byproducts are less degradable in the rumen.展开更多
基金This study was supported by Science and Technology Planning Project of Tianjin City,China(2018YFD0500603).
文摘This study aimed to elucidate the effect of a pellet feed containing fermented proteins on pond-raised Chinese mitten crabs,Eriocheir sinensis in a 7-month crab feeding experiment in Gucheng Lake,Jiangsu province,China.The results showed that fermented protein could significantly increase mean weight gain,crab size and total yield compared with control group.Moreover,the mean weight of male crabs and the number of large-sized male crabs improved over those of the control group.However,feed efficiency ratio did not differ significantly between the two groups.The amino acid content in the muscles of the female crabs of both the groups was higher than that in the muscles of the male crabs.The present study suggests that fermented compound protein may be one kind of potential protein sources for E.sinensis.
基金supported by Louisiana Board of Regents Research grant
文摘Background：Algae are widely recognized for their high oil content and for exponentially accumulating biomass with particular potential to provide single cell protein for human consumption or animal feed.It is believed that along with biodiesel from algae,the high protein de-oiled algal residue may become an alternative feed supplement option in the future.This study was conducted to investigate de-oiled algal residue obtained from the common Chlorella species,Thalassiosira weissflogii,Selenarstrum capricornutum,Scenedesmus sp.,and Scenedesmus dimorphus for assessment as potential feed supplements for ruminants by comparing with soybean（Glycine max） meal and alfalfa（Medicago sativa） hay.Results：With the exception of T.weissflogii,algal residue had higher concentrations of Cu,Zn,and Mn and lower concentration of Ca,Mg,and K than soybean meal and alfalfa hay.The algal residue CP（crude protein）concentrations ranged from 140 to 445 g/kg DM and varied among the de-oiled residues.In vitro rumen fermentation gas accumulation curves indicated that algal biomass degradation potential was less than that of soybean meal or alfalfa hay by up to 41.7%.The gas production curve,interpreted with a dual pool logistic model,confirmed that the fraction sizes for fast fermenting and slow fermenting of de-oiled algal residues were smaller than those in soybean meal and alfalfa hay,and the fermenting rate of the fractions was also low.Conclusions：Inferior in vitro rumen gas accumulation from the five de-oiled algal residues suggests that these algal byproducts are less degradable in the rumen.
