The aim of this work was to study the performance of rabbits in the growth phase fed with commercial diets with and without elephant grass supplementation. For this, a biological assay was conducted with 18 White New Zealand rabbits with initial age of 58 days. The rabbits were randomly distributed in individual cages where they received feed and water ad libitum. The two groups studied were: CG -control group that received only commercial ration and EG group -that received commercial ration and elephant grass at will in the morning. During the biological test, animal weight, waste, leftovers and consumption were recorded weekly. The biological assay lasted for 28 days, and the animals aged 86 days. The performance measures of each phase were submitted to Analysis of Mean Variance (ANOVA). The animals in the CE group presented better performance when compared to CT in the growth stages I (58 to 65 days), termination I (72 to 78 days) and termination II (78 to 86 days). Thus, only during one of the four phases studied (65 to 72 days) did the animals show no difference in the performance parameters. It is still worth mentioning that at this stage there was a great waste of EG by animals. Based on the data obtained it was concluded that the use of elephant grass for rabbits as a complement to the feed is feasible. In this sense, the bulk in question tends to improve the feed conversion and the weight gain of the animals.
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