Fermentation, utilization, and palatability of swine waste ensiled with various proportions of ground orchardgrass hay or ground corn grain.
Berger, Jerry Carl Albert
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Experiments were conducted to determine the feasibility of ensiling swine waste with orchardgrass hay or with ground corn grain. Swine waste was ensiled with either orchardgrass hay or ground corn grain in small laboratory silos in the following proportions, on an as is basis: 80:20, 70:30, 60:40, 50:50, 40:60, 30:70 and 20:80. Good fermentation, as measured by pH and level of lactic acid, occurred in swine waste-orchardgrass hay ratios of 40:60, 50:50, and 60:40. Bacteria and total coliform numbers were decreased and fecal coliforms were completely destroyed by ensiling. Ensiled mixtures of swine waste and ground corn grain containing more than 30% ground corn exhibited good fermentation characteristics, however, mixtures containing 70% swine waste and above had an offensive odor and would be difficult to handle by conventional methods. In a subsequent study swine waste and orchardgrass hay were ensiled in proportions of 40:60 and 60:40 in steel drums lined with plastic. Fermentation parameters were similar to those in the small silo study. Twelve wethers were used in a digestion study and 24 in a palatability study. The four diets fed were: 1) ground orchardgrass hay alone (negative control); 2) ensiled swine waste and ground orchardgrass hay (40:60); 3) ensiled swine waste and ground orchardgrass hay (60:40); and 4) ground orchardgrass hay plus soybean meal (positive control).
- Doctoral Dissertations