凡纳滨对虾饲料中菜籽粕替代鱼粉适宜比例的研究

以饲料中添加36％鱼粉作为对照组,用菜籽粕分别替代饲料配方中10％～50％的鱼粉,配成5种等氮等能试验饲料,饲喂凡纳滨对虾,研究不同替代比例对凡纳滨对虾生长性能和虾体氨基酸组成的影响.试验结果表明,饲养56d后,随着菜籽粕替代鱼粉比例的增加,对虾的质量增加率下降,但仅50％替代比例试验组的质量增加率为1542.74％,...

Proper Proportion of Rapeseed Meal Substitution for Fish Meal in Diet of Pacific White Leg Shrimp Litopenaeus vannamei

A 56 d feedingtrial was conducted to evaluate the effects of replacement of fish meal by rapeseed meal in practical diets on growth performance and amino acid profile of Pacific whiteleg shrimp Litopenaeus vannamei.In six isonitrigenous diets containing 36.5% protein and 7.5% lipid(Ctrl),fish meal was replaced by rapeseed meal at five inclusion levels of 10%(RM1),20%(RM2),30%(RM3),40%(RM4) and 50%(RM5).The control diet contained 36% fish meal.The shrimp juveniles with initial body weight of 0.247 g were randomly stocked in 260 L tanks at a rate of 30 shrimp per tank and fed the six diets with triplication four times daily.The survival,growth,feed conversion ratio(FCR) and protein efficiency ratio were not significantly affected by the replaced quantity under 50% replacement in 4 weeks.In 8 weeks,however,the weight gain was found to be decreased with increasing inclusion of rapeseed meal except that the weight gain in RM5(1542.74%) was significantly lower than that in the control group.The regression equation of weight gain(y) and additive rapeseed meal(x) was expressed by binomial:y=-0.8674x2+ 12.917x +2031.7(r2=0.9081),passing inflection point method calculated meal for the optimal adding amount 7.37%(converted to replace quantity for 12.70%),in accordance with the confidence law theory,in 99% of the confidence level.The optimal replacement was found to be from 3.17% to 22.48%.No significant differences in the survival and FCR were in the treatment groups under 50% compared to the control group.There were significantly lower survival and methionine and arginine concentration in body,and higher FCR in the shrimp fed the diet containing than those in the control group.From the experiment,it was feasible to replace dietary fish meal with rapeseed meal at level of 22.48% for the shrimp.