Distillers’Grains-Yeast Culture Affecting Growth Performance and Lysozyme Activity in Grass Carp (Ctenopharyngodon idellus)

doi:10.11924/j.issn.1000-6850.casb17040066

Abstract

Abstract: The basal feed (feed for polyculture) was respectively replaced by 0% (control), 8%, 10%, 12%, 16% distillers’grains-yeast culture. Through 10 weeks of feeding experiment, the effects of partial distillers’ grains-yeast culture replacement on the growth performance, apparent digestibility and lysozyme activity were determined. The results showed that the distillers’grains-yeast culture replacement significantly affected the growth performance of grass carp, compared with the control. Body weight gain in 12%, 16%, 10% and 8% replacement groups was 14.66% , 12.19% , 9.74% and 6.70% , respectively. Between the control and replacement groups, the average weight gain rate and absolute growth rate were significantly different (P＜ 0.05), but feed conversion ratio, condition factor and viscera index showed no significant differences (P＞0.05). The apparent digestibility of ash in 16% replacement group was significantly lower than that in the control and other replacement groups (P＜0.05); the apparent digestibility of dry matter in 16% and 12% replacement groups were significantly lower than that in the control and other replacement groups (P＜0.05); the apparent digestibility of crude fat, crude protein and total phosphorus did not show significant differences (P＞0.05) between the control and replacement groups. Based on growth performance and apparent digestibility, 12% was the best replacement ratio. In addition, we collected serum and liver samples of grass carp and determined lysozyme activity. The results showed that in liver, lysozyme activity in the control and 8% replacement group was significantly different from that in 10%、12% and 16% replacement groups. In serum, the control showed significant differences in lysozyme activity with 10% , 12% and 16% replacement groups (P＜0.05); 8% replacement group showed significant difference in lysozyme activity with 16% replacement group; and there were no significant differences among other groups (P＞0.05). Distillers’grains-yeast culture replacing basal feed can significantly speed up the growth of grass carp, and the activity of lysozyme in grass carp did not show significant increase and peak.

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