用家禽的粪便作为植物肥料使磷大量散布于环境中，导致了严重的环境污染。人们已致力于通过减少粪磷的排泄来降低粪磷导致地表水的富营养化作用。一种方法是在日粮中添加植酸酶，家禽日粮中大多数的磷以植酸磷的形式存在，这种形式的无...用家禽的粪便作为植物肥料使磷大量散布于环境中，导致了严重的环境污染。人们已致力于通过减少粪磷的排泄来降低粪磷导致地表水的富营养化作用。一种方法是在日粮中添加植酸酶，家禽日粮中大多数的磷以植酸磷的形式存在，这种形式的无机磷难以被肉鸡利用，因为单胃动物体内缺乏或很少有植酸酶，这种酶可以破坏植酸盐的分子结构，将磷释放并被机体吸收坏植酸盐的分子结构，将磷释放并被机体吸收（0'Dell等，1972；Raboy,1990)。Nelson等（1968，1971）阐述了在肉仔鸡日粮中添加植酸酶可提高对植酸磷的利用率。Ravindran等（1995），Sebas-tian等（1998）综述中报道，近来研制的商用植酸酶通过增加肉鸡对一部分植酸磷的利用而减少粪磷的排泄量，另一种方法是培育含低植酸磷的利用而减少粪磷的排泄量，另一种方法是培育含低植酸磷的饲料原料。Raboy和Gerbasi(1996),Raboy(1997)利用玉米的LPA1基因的等位基因-lpa-1基因，培育出了含低植酸磷和高有效磷的玉米。本试验用的高玉米（High available phosphoruscorn,HAPC)含总磷0.27%，有效磷（AP）0.17%，普通黄玉米（Yellow dent corn,YDC)含量总磷（TP）0.26%，有效磷0.03%)。展开更多
An experiment was conducted to evaluate the effects of degossypolled cottonseed meal(DCM) on Japanese sea bass(Lateolabrax japonicus,(5.04±0.02) g initial body weight).Five experimental diets DCM 0,DCM 25,DCM 50,...An experiment was conducted to evaluate the effects of degossypolled cottonseed meal(DCM) on Japanese sea bass(Lateolabrax japonicus,(5.04±0.02) g initial body weight).Five experimental diets DCM 0,DCM 25,DCM 50,DCM 75A,DCM 75 were formulated to contain 0,15.2%,30.5%,46%,and 46% DCM to replace 0,25%,50%,75%,75% fish meal protein respectively,and the DCM 75 A was supplemented with lysine and methionine to be similar to DCM 0 for Japanese sea bass.Three tanks were randomly assigned to each diet,and 16 fish were batch weighed and stocked into each tank.Faecal were collected after 2 weeks of normal feeding for nutrients apparent digestibility coefficients(ADCs) determination,and the growth trial lasted for 8 weeks.The results showed that fish fed diets DCM 50 had significantly higher feed conversion ratio(FCR) and lower protein efficiency ratio(PER) than that of DCM 0 group(P<0.05).Fish fed DCM 75A and DCM 75 diets had significantly lower growth performances than those of fish fed diet DCM 0(P<0.05),but the lysine and methionine supplement improved PER of diet DCM 75A diet.There were no significant differences in ADCs of dry matter,crude protein,crude lipid,energy and body composition.The present results indicate that DCM may be included in the diet up to 30.5% as a substitute for fish meal,and it can replace about 50% of fish meal protein.展开更多
文摘用家禽的粪便作为植物肥料使磷大量散布于环境中，导致了严重的环境污染。人们已致力于通过减少粪磷的排泄来降低粪磷导致地表水的富营养化作用。一种方法是在日粮中添加植酸酶，家禽日粮中大多数的磷以植酸磷的形式存在，这种形式的无机磷难以被肉鸡利用，因为单胃动物体内缺乏或很少有植酸酶，这种酶可以破坏植酸盐的分子结构，将磷释放并被机体吸收坏植酸盐的分子结构，将磷释放并被机体吸收（0'Dell等，1972；Raboy,1990)。Nelson等（1968，1971）阐述了在肉仔鸡日粮中添加植酸酶可提高对植酸磷的利用率。Ravindran等（1995），Sebas-tian等（1998）综述中报道，近来研制的商用植酸酶通过增加肉鸡对一部分植酸磷的利用而减少粪磷的排泄量，另一种方法是培育含低植酸磷的利用而减少粪磷的排泄量，另一种方法是培育含低植酸磷的饲料原料。Raboy和Gerbasi(1996),Raboy(1997)利用玉米的LPA1基因的等位基因-lpa-1基因，培育出了含低植酸磷和高有效磷的玉米。本试验用的高玉米（High available phosphoruscorn,HAPC)含总磷0.27%，有效磷（AP）0.17%，普通黄玉米（Yellow dent corn,YDC)含量总磷（TP）0.26%，有效磷0.03%)。
文摘An experiment was conducted to evaluate the effects of degossypolled cottonseed meal(DCM) on Japanese sea bass(Lateolabrax japonicus,(5.04±0.02) g initial body weight).Five experimental diets DCM 0,DCM 25,DCM 50,DCM 75A,DCM 75 were formulated to contain 0,15.2%,30.5%,46%,and 46% DCM to replace 0,25%,50%,75%,75% fish meal protein respectively,and the DCM 75 A was supplemented with lysine and methionine to be similar to DCM 0 for Japanese sea bass.Three tanks were randomly assigned to each diet,and 16 fish were batch weighed and stocked into each tank.Faecal were collected after 2 weeks of normal feeding for nutrients apparent digestibility coefficients(ADCs) determination,and the growth trial lasted for 8 weeks.The results showed that fish fed diets DCM 50 had significantly higher feed conversion ratio(FCR) and lower protein efficiency ratio(PER) than that of DCM 0 group(P<0.05).Fish fed DCM 75A and DCM 75 diets had significantly lower growth performances than those of fish fed diet DCM 0(P<0.05),but the lysine and methionine supplement improved PER of diet DCM 75A diet.There were no significant differences in ADCs of dry matter,crude protein,crude lipid,energy and body composition.The present results indicate that DCM may be included in the diet up to 30.5% as a substitute for fish meal,and it can replace about 50% of fish meal protein.
