The phenyl and methyl phenyl free radicals,formed in the oxidation-hydrolysis process of N’-acyl-N-phenylhydrazine, have been studied by ESR spectrometry.It was found that the free radical is the chief cause which pr...The phenyl and methyl phenyl free radicals,formed in the oxidation-hydrolysis process of N’-acyl-N-phenylhydrazine, have been studied by ESR spectrometry.It was found that the free radical is the chief cause which produces the feed-back inhibition effect in the hydrazine-promoted infectious development of silver halide.展开更多
Deoxynivalenol(DON)negatively affects the growth of piglets.Electron beam irradiation(EBI)has the potential to reduce the DON content in feeds.However,the quantitative effects of DON contamination and EBI on the nutri...Deoxynivalenol(DON)negatively affects the growth of piglets.Electron beam irradiation(EBI)has the potential to reduce the DON content in feeds.However,the quantitative effects of DON contamination and EBI on the nutritional value of corn remain unclear,as does the impact of this corn on piglet feeding.These experiments explored the effect of DON contamination and EBI treatment on the nutritional value of corn and the feeding effects of this corn on piglets.In Exp.1,40 piglets(initial weight:14.88±1.92 kg)were allotted to five experimental diets with eight replicates per diet.Five diets included four types of corn diets:normal corn(NC),DON-contaminated corn(DON-C),EBI-treated NC(EBI-NC),and EBI-treated DON-C(EBI-DON-C),and a nitrogen-free diet formulated to determine the basal endogenous loss of amino acids.In Exp.2,56 piglets(initial weight:7.58±0.35 kg)were randomly allocated to treatments arranged in a 2×2 factorial arrangement,with two types of corn(NC vs.DON-C)and two corn treatments(without EBI vs.EBI).There were four diets and seven replicate pens per diet,with two pigs per pen.The study found that both DON contamination and EBI treatment decreased the effective energy value of corn(P<0.05),and EBI treatment also decreased the standardized ileal digestibility(SID)of most amino acids(P<0.05),whereas DON contamination had no negative effect on the SID of amino acids(Exp.1).In Exp.2,EBI-treated corn(EBI-C)increased the average daily gain(P=0.001)and average daily feed intake(P<0.001),while increased feed conversion ratio(FCR)(P<0.001)and decreased nutrient digestibility(P<0.05).DON-C had a positive impact on FCR(P=0.005).Neither EBI-C nor DON-C affected serum biochemical parameters(P>0.05).However,DON-C may induce oxidative stress,impair immune function,and disrupt intestinal barrier.In conclusion,EBI reduced the DON content of DON-C,while impacted the nutritional value of corn.Furthermore,DON-C reduced the antioxidant capacity and immune function of piglets to some extent,although it did not affect their growth performance.展开更多
Coral trout Plectropomus leopardus is a high-economical value of marine fish commodity.So,the larviculture for this species should be performed in hatchery scale for their sustainability.One of the important thing in ...Coral trout Plectropomus leopardus is a high-economical value of marine fish commodity.So,the larviculture for this species should be performed in hatchery scale for their sustainability.One of the important thing in larval stage is hormonal mechanisms.Thyroid hormone is known plays an important role in the metamorphosis of marine fish larvae.The source of that hormone is assumed derived from zooplankton as their live feeds.The live feeds commonly used for marine fish larvae in hatchery are zooplankton copepods and rotifers.The purpose of this research to determine the influence of feeding copepods and rotifers on thyroid hormone profile activity,consisted of triiodothyronine(T3)and thyroxine(T4),related to the metamorphoses of coral trout larvae.The research was conducted using three feeding schemes:copepods(A),copepods-rotifers(B),and rotifers(C).It was done for 50 Days After Hatching(DAH).The results showed that larvae from treatment(A)and(B)achieved the highest level of T3 and T4 earlier at 30 DAH,which indicated that both of those larvae have entered the metamorphosis stage earlier.On the other hand,larvae from treatment(C)achieved it and entered the metamorphosis stage later at 40 DAH.In addition,iodine levels in the copepods were significantly higher than those of in rotifers(P<0.05).Based on this research,live feeds copepods and rotifers have effect on thyroid hormone activity.Copepods have better potential in accelerating the metamorphosis achievement of coral trout larvae with the fact that they have higher iodine content.展开更多
文摘The phenyl and methyl phenyl free radicals,formed in the oxidation-hydrolysis process of N’-acyl-N-phenylhydrazine, have been studied by ESR spectrometry.It was found that the free radical is the chief cause which produces the feed-back inhibition effect in the hydrazine-promoted infectious development of silver halide.
基金supported by Sichuan Province Major Science and Technology Special Projects(2021ZDZX0009)the Sichuan Pig Innovation Team of National Modern Agricultural Industry Technology System of China(scsztd-2024-08-11).
文摘Deoxynivalenol(DON)negatively affects the growth of piglets.Electron beam irradiation(EBI)has the potential to reduce the DON content in feeds.However,the quantitative effects of DON contamination and EBI on the nutritional value of corn remain unclear,as does the impact of this corn on piglet feeding.These experiments explored the effect of DON contamination and EBI treatment on the nutritional value of corn and the feeding effects of this corn on piglets.In Exp.1,40 piglets(initial weight:14.88±1.92 kg)were allotted to five experimental diets with eight replicates per diet.Five diets included four types of corn diets:normal corn(NC),DON-contaminated corn(DON-C),EBI-treated NC(EBI-NC),and EBI-treated DON-C(EBI-DON-C),and a nitrogen-free diet formulated to determine the basal endogenous loss of amino acids.In Exp.2,56 piglets(initial weight:7.58±0.35 kg)were randomly allocated to treatments arranged in a 2×2 factorial arrangement,with two types of corn(NC vs.DON-C)and two corn treatments(without EBI vs.EBI).There were four diets and seven replicate pens per diet,with two pigs per pen.The study found that both DON contamination and EBI treatment decreased the effective energy value of corn(P<0.05),and EBI treatment also decreased the standardized ileal digestibility(SID)of most amino acids(P<0.05),whereas DON contamination had no negative effect on the SID of amino acids(Exp.1).In Exp.2,EBI-treated corn(EBI-C)increased the average daily gain(P=0.001)and average daily feed intake(P<0.001),while increased feed conversion ratio(FCR)(P<0.001)and decreased nutrient digestibility(P<0.05).DON-C had a positive impact on FCR(P=0.005).Neither EBI-C nor DON-C affected serum biochemical parameters(P>0.05).However,DON-C may induce oxidative stress,impair immune function,and disrupt intestinal barrier.In conclusion,EBI reduced the DON content of DON-C,while impacted the nutritional value of corn.Furthermore,DON-C reduced the antioxidant capacity and immune function of piglets to some extent,although it did not affect their growth performance.
文摘Coral trout Plectropomus leopardus is a high-economical value of marine fish commodity.So,the larviculture for this species should be performed in hatchery scale for their sustainability.One of the important thing in larval stage is hormonal mechanisms.Thyroid hormone is known plays an important role in the metamorphosis of marine fish larvae.The source of that hormone is assumed derived from zooplankton as their live feeds.The live feeds commonly used for marine fish larvae in hatchery are zooplankton copepods and rotifers.The purpose of this research to determine the influence of feeding copepods and rotifers on thyroid hormone profile activity,consisted of triiodothyronine(T3)and thyroxine(T4),related to the metamorphoses of coral trout larvae.The research was conducted using three feeding schemes:copepods(A),copepods-rotifers(B),and rotifers(C).It was done for 50 Days After Hatching(DAH).The results showed that larvae from treatment(A)and(B)achieved the highest level of T3 and T4 earlier at 30 DAH,which indicated that both of those larvae have entered the metamorphosis stage earlier.On the other hand,larvae from treatment(C)achieved it and entered the metamorphosis stage later at 40 DAH.In addition,iodine levels in the copepods were significantly higher than those of in rotifers(P<0.05).Based on this research,live feeds copepods and rotifers have effect on thyroid hormone activity.Copepods have better potential in accelerating the metamorphosis achievement of coral trout larvae with the fact that they have higher iodine content.
