Per unit energy, fiber is among the most expensive components of the ruminant diet. Wastes from human enterprises may represent the next step in feedstuff investigation. In an effort to minimize the anthropogenic waste contribution, and as a means to find a more cost-efficient resource to feed ruminant animals, our objective was to determine the nutritive value of disposable coffee cups and warmer sleeves in relation to ruminant nutrition. Discarded cups and warmer sleeves were collected from employees at Tarleton State University in fall of 2017. Cups were obtained from five sources, and warmer sleeves were obtained from two sources. Cups and sleeves were dried at 55°C for 72 h and ground to pass through a 2-mm screen. Ground samples were subjected to a batch-culture in vitro true digestibility (IVTD) assay. Original samples and incubated residues were then assayed for DM, NDF, ADF, and CP. Data were analyzed as a random effects model completely randomized design using the MIXED procedure of SAS. There was no effect (P > 0.05) of source (n = 5) or type (cup or sleeve) for contribution to variance of NDF, ADF, IVTD, and in vitro NDF digestibility (IVNDFD). Mean values for NDF, ADF, IVTD, and IVNDFD across samples were 89.5, 81.4, 24.5, and 18.7%, respectively. Results indicate a low digestibility coefficient for these waste products, thus meaning its use as a feedstuff could be questionable. However, such results provide insight into niches where this product and other anthropogenic wastes may fit in the larger picture of ruminant nutrition
It is important for researchers, as progressive producers, to consider human enterprise wastes as one of the next steps in feedstuff investigation. In an effort to reuse a seemingly useless and disposable component of one of America’s most enjoyed aquatic delicacies, our objective was to determine the nutritive value of crawfish and shrimp shells in relation to ruminant nutrition. These discarded items were collected from local events and sorted into four different groups: crawfish heads, crawfish tails, shrimp shells, and shrimp tails. Crawfish and shrimp wastes were tested independent of each other. These groups were dried at 55°C for 72 h and ground to pass through a 2-mm screen. Samples were subjected to a batch-culture in vitro true digestibility (IVTD) assay. A separate set of samples (1 mm) were assayed for dry matter, neutral detergent fiber (NDF), and acid detergent fiber (ADF), and acid detergent lignin (ADL; inclusive of residual ash). Data were analyzed as a completely randomized design using the MIXED procedure of SAS. Crawfish heads were assayed to contain 26.2% NDF, 13.4% ADF, and 1.0% ADL, while crawfish tails contained 23.7% NDF, 16.3% ADF, and 1.1% ADL. Crawfish heads and tails did not differ in IVTD (P = 0.48) or in vitro NDF digestibility (IVNDFD; P = 0.13; 76.7 vs. 77.2% and 86.8 vs. 91.0%, respectively). Shrimp shells contained 36.1% NDF, 26.9% ADF, and 4.1% ADL, whereas shrimp tails contained 29.1% NDF, 17.9% ADF, and 0.7% ADL. Shrimp tails had greater (P < 0.01) IVTD (74.2 vs. 66.4%) but lesser (P = 0.01) IVNDFD than shrimp shells (80.6 vs. 85.0%). Results are interpreted to mean that crustacean waste may represent a suitable prospective feedstuff for further evaluation.
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