To investigate the effect of feed protein levels on growth and feed utilization of juvenile Lateolabraxjaponicus, fish meal was used as the major protein source to prepare five isoenergetic experimental feeds containi...To investigate the effect of feed protein levels on growth and feed utilization of juvenile Lateolabraxjaponicus, fish meal was used as the major protein source to prepare five isoenergetic experimental feeds containing 35.0%, 37.5%, 40.0%, 42.5% and 45.0% protein, respectively. Juvenile L. japonicus with the initial average body weight of （84.81 ±0.92） g were fed for 75 d to determine the best protein level for juvenile L. japonicus. The results showed that the relative weight gain rate, specific growth rate and feed conversion ratio in the group containing 39.85% protein were extremely higher than those in the groups containing 34.76% and 37.54% protein （ P 〈 0.01 ）, but had no significant difference with that in the group containing 42.34% protein （ P 〉0.05）. Protein efficiency ratio in the group containing 39.85% protein was also significantly higher than those in the groups containing 34.76%, 42.34% and 45.03% protein （ P 〈0.05）, while had no significant difference with that in the group containing 37.54% protein（ P 〉0.05）. In this experiment, based on quadratic model regression analysis of specific growth rate and protein efficiency ratio, growth performance and feed utilization rate of L. japonicus was the best when the protein content of feed was from 38.87% to 41.50%.展开更多
基金Supported by Science and Technology Spark Program of Fujian Province(2011S0015)
文摘To investigate the effect of feed protein levels on growth and feed utilization of juvenile Lateolabraxjaponicus, fish meal was used as the major protein source to prepare five isoenergetic experimental feeds containing 35.0%, 37.5%, 40.0%, 42.5% and 45.0% protein, respectively. Juvenile L. japonicus with the initial average body weight of （84.81 ±0.92） g were fed for 75 d to determine the best protein level for juvenile L. japonicus. The results showed that the relative weight gain rate, specific growth rate and feed conversion ratio in the group containing 39.85% protein were extremely higher than those in the groups containing 34.76% and 37.54% protein （ P 〈 0.01 ）, but had no significant difference with that in the group containing 42.34% protein （ P 〉0.05）. Protein efficiency ratio in the group containing 39.85% protein was also significantly higher than those in the groups containing 34.76%, 42.34% and 45.03% protein （ P 〈0.05）, while had no significant difference with that in the group containing 37.54% protein（ P 〉0.05）. In this experiment, based on quadratic model regression analysis of specific growth rate and protein efficiency ratio, growth performance and feed utilization rate of L. japonicus was the best when the protein content of feed was from 38.87% to 41.50%.
