PSII-1 Evaluation of RUP content and digestibility of feeds from organic and conventional sources
| Autor: | Hannah C Wilson, James C. MacDonald, Terry J. Klopfenstein, Galen E. Erickson, Elizabeth Schumacher |
|---|---|
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | J Anim Sci |
| ISSN: | 1525-3163 0021-8812 |
| Popis: | The purpose of this study was to evaluate and compare 17 different feeds for in situ rumen undegradable protein content (RUPc) and digestibility (RUPd) with the main objective being a comparison of organic and conventional sources of feeds. Two steers fitted with rumen cannulas and two heifers with duodenal cannulas were utilized for this study. Feeds used were procured from both conventional and USDA certified organic sources. Conventional feeds included field peas (FP), fish meal (FM), soybean meal (SBM), and dehydrated alfalfa (DA). Organic feeds included field peas (FPO), fish meal (FMO), soybean meal (SBMO), and dehydrated alfalfa (DAO). Each sample was weighed into both 5×10 cm and 10×20 cm dacron bags. Bags were evenly distributed between steers and ruminally incubated for 16 hours, replicated over two days. The 5×10 cm bags were treated with pepsin/HCl solution, inserted into the duodenum of the heifers, and retrieved from the feces to measure RUPd. Bags were washed, oven dried overnight, and residues composited to determine RUPc and RUPd. No digestibility data were gathered from FM or FMO due to lack of residue from digestion. Statistical analysis was performed using the Glimmix procedure of SAS, with sample as the experimental unit. The RUPc of DAO was not different (P = 1.0) from DA; SBMO was 32.7% greater (P < 0.01) than SBM; FMO was 30.2% greater (P < 0.01) than FM; FPO were not different (P = 0.46) than FP. The RUPd of DAO was 26.3% greater (P < 0.01) than DA; no differences were observed between SBMO and SBM or FPO and FP (P > 0.98). These data indicate that there may be some differences in rumen undegradable protein content and digestibility between conventional and certified organic feeds when measured in situ. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|