C:\MYDOCU~1\Microtracer paper J
نویسنده
چکیده
We have developed anew technique for the application of microtracer technology to the on-site assessment of microingredient uniformity in diets for feedlot cattle. The influence of dietary forage (12 vs 24%) and molasses levels (6, 12, 18, and 24%) on the efficiency of recovery of microtracer (33 g/ton) using this new technique was compared with that of chromic oxide (87.4 g/ton) and laidlomycin propionate (101.5 g/ton). The order of ingredient addition to the batch mixer was as follows: grain, mineral supplement, forage, fat, and molasses. Markers were premixed with 10 kg of mineral supplement in a small cement mixer before being added to the batch mixer. The grain and mineral supplements were mixed together for I min before addition of the remaining ingredients. After all ingredients were added to the mixer, the batch was mixed for an additional 5 min. An 8-kg sample was taken from each feed batch (341 kg) as it exited the mixer. Eight separate batches (replications) of each dietary treatment were produced. Marker recovery averaged 103.5, 78.3, and 97.2% for microtracer, chromic oxide, and laidlomycin, respectively. The corresponding CV for marker recovery averaged 8.1, 7.2, and 13.0%, respectively. There were no treatment effects (P > .20) on recovery of microtracer and laidlomycin. With chromic oxide, recovery increased (linear effect, P < .05) with increasing molasses level, and decreased (P <.10) with increased forage level. The CV for microtracer recovery also tended (linear effect, P < .10) to decrease with increasing molasses level. Recovery of microtracer and laidlomycin were not different (P > .20), and both were greater (P < .0 1) than chromic oxide. The CV for marker recovery were not different (P > .20) for microtracer and chromic oxide, and both were less (P < .01) than that of laidlomycin. We concluded that the microtracer technique we have developed is a reliable and inexpensive tool for rapid on-site assessment of microingredient distribution in complete mixed diets for feedlot cattle. Very wide ranges in forage and liquid supplement content of the diet do not appear to pose an appreciable limitation to the reliability of the technique.
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