Dose-Responses of Broiler Chicks, Given Live Coccidia Vaccine on Day of Hatch, to Diets Supplemented with Various Levels of Farmatan® (Sweet Chestnut Wood Tannins) or BMD®/Stafac® in a 42-Day Pen Trial

Abstract

Dietary Farmatan® Powder (~73% tannins) was used to determine live performance dose-responses of male Cobb broiler chicks on built-up litter top dressed with wood shavings in a summer trial. Dietary Farmatan® concentrations used were: 0 (negative control), 250, 750, or 1,000 ppm. Positive control (antibiotic) diets had BMD^® 55 ppm (0-35 days) and Stafac^® (35-42 days). Feeds were steam pelleted and fed as crumbles or pellets. There were 45 chicks/pen initially and 8 replicate pens/treatment (8 blocks of 6 pens each; Randomized Complete Block Design; LSD p = 0.05). The body weight (BW) gains were not significantly different from 0-21 d or 0-35 days but from 0-42 days (p = 0.002) were, respectively (kg): 2.238^b, 2.238^b, 2.299^a, 2.282^ab, 2.290^a, 2.316^a. Mortality-adjusted Feed Conversion Ratios (MAFCR) from 0-21 days (p = 0.002) were, respectively: 1.513^a, 1.488^ab, 1.476^bc, 1.469^bc, 1.454^c and 1.442^c. The MAFCR from 0-35 days (p = 0.001) were, respectively: 1.666^a, 1.657^ab, 1.646^abc, 1.626^cd, 1.621^d and 1.641^bcd. The MAFCR from 0-42 days (p = 0.004) were, respectively: 1.694^a, 1.698^a, 1.685^ab, 1.665^bc, 1.661^bc and 1.655^c. Stafac^® 22 ppm in finisher (35-42 days) gave the best BW gain and feed conversion ratio. Litter moisture % at 21 days was lower (p = 0.032) using Farmatan^® 500, 750, or 1,000 ppm than BMD^® 55 ppm and at 42 days was lower (p = 0.046) for each Farmatan^® level than for negative control. Farmatan^® 750 or 1,000 ppm improved (p=0.008) 42-d litter score (0 driest to 5 wettest) compared to negative control. Mortality % from 0-42 days and litter nitrogen % at 42 days were unaffected by treatment. Farmatan^® improved BW gain and MAFCR and promoted drier litter.