Effect of ractopamine hydrochloride on growth promotion in guinea pigs (Cavia porcellus)

Abstract

Ractopamine hydrochloride (R) is commonly used in the livestock industry, mainly in pork and beef, to improve feedefficiency and productivity. In the present study, the use of R at different doses (20 ppm, 30 ppm, or 40 ppm) on growth performanceand carcass characteristics of guinea pigs (male and female) was explored with a view to achieving greater use of this species for humanconsumption. Thirty-two clinically healthy guinea pigs at an average age of 5 weeks were used. The daily gain, feed over gain ratio,Kleiber ratio, carcass yield, and muscle thickness of the thigh in millimeters were measured. The results obtained were compared to acontrol group treated with only purified water, without R. Arithmetically, the measured variables showed benefits in the groups treatedwith R, with the results of Kleiber ratio and muscle thickness of the right thigh demonstrating statistical significance (P < 0.05). In thepresent work, the noncastrated males treated with R exhibited a more positive effect than the females (P = 0.006). The results suggestthat the use of R as a growth promoter could benefit the productivity of guinea pigs for human consumption.