Nutritional Aspect of Virginiamycin in Feeds

Effect of virginiamycin and monensin supplementation on performance of multiparous Holstein cows

“…Some studies have indicated a growth promoting effect of virginiamycin in ruminants through improved weight gain and feed efficiency and decreased incidence of liver abscesses and acidosis in grain fed cattle (Hedde, 1984;Rogers et al, 1995). The effect of virginiamycin on gram-positive bacteria is similar to that of monensin, although the modes of action differ (Nagaraja et al, 1987).…”

The Rumen Microbial Ecosystem

“…Although tylosin is absorbed to some extent from the gut and could reach the liver, it is believed to exert its primary effect in the rumen. Results from some studies have also indicated a growthpromoting effect of virginiamycin in ruminants as evidenced by improved weight gain and feed efficiency and decreased incidence and severity of liver abscesses in grain-fed cattle (Parigi-Bini, 1979;Hedde, 1984;Skrivanova and Marounek, 1993;Rogers et at., 1995). In addition to reduction of liver abscesses, feeding of tylosin also improves weight gain and feed efficiency (Potter et at., 1985).…”

Lack of effect of dietary energy‐to‐protein ratio and energy concentration on the response of broiler chickens to virginiamycin

“…However, VIR does not consistently improve either performance or dietary ME (Boorman, 1987;Henry et al, 1987;Izat et al, 1989). Differences in dietary composition and ingredients can influence the response of the birds to growth promoters (Eyssen and De Somer, 1963;Hedde, 1983;Stutz and Lawton, 1984;Boorman, 1987).…”

“…Virginiamycin (VIR), an antibiotic growth promoter, has been reported to improve the growth rate and food efficiency of broiler chickens (Eyssen and De Somer, 1963;Nelson et al, 1963;March et al, 1978;Hedde, 1983;Rosen, 1983;Leeson, 1984;Boorman, 1987;Daniels, 1989;Bartov, 1990). This is due, in part, to its energy-sparing effect, which in turn, increases dietary ME by 3-0-7-2% (Nelson et al, 1963;March et al, 1978;Boorman, 1987).…”