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0614 Sampling corn silage in bags from the sides.

Research paper by P. Turiello, M. Ruiz de Huidobro, H. Garcia, L. Forcone C. Celaye

Indexed on: 29 Nov '16Published on: 01 Oct '16Published in: Journal of animal science



Abstract

Because composition variation in silo bags is expected along the tube, and as nutritionists need to know forage composition before it is consumed, it is necessary to collect representative samples from the sides of the tube. The aim of the study was to determine if the composition of the side samples was similar to that of the face samples. Seven corn silage bags in dairy farms in Cordoba and Santa Fe provinces (Argentina) were sampled. Duplicate samples were taken from 5 different areas of the face of the bag (F1) with a core sampler. Then, 2 to 4 samples from both sides, 2 m forward in the bags, were taken (S). When the front achieved the same place where the side samples were taken, the newly exposed face was sampled again as in F1 (F2). After sampling, samples were stored in a refrigerated box for the rest of the day and sent to the same commercial laboratory to determine percentages of DM, NDF, ADF, CP, and ash by NIR. Nutrient composition of corn silage in F2 and S was compared using a mixed procedure of InfoStat, with silage bag as a random effect and sampling site as a fixed effect. Mean DM percentage (31.8 ± 4.0%) was inside the recommended range for corn silage, although the 80% range is lower than recommended, indicating early cuttings compared to optimum. The other nutrients were in accordance to typical values of corn silage. When evaluating different areas in both F1 and F2, no differences were found for nutrient composition accounting for the silage bag and type of face (F1 and F2) as random effects. No differences between F2 and S were found in DM, NDF, ADF, and ash content, although CP levels showed different values in the side samples (Table 1). Our results showed that side samples are representative comparing them with the front of the bag regarding most nutrients. Nevertheless, more research is needed to determine a complete side sampling methodology for bagged silage.View Full Table Close Full View