1. Diurnal variation in fecal concentrations of acid-detergent insoluble ash and alkaline-peroxide lignin from cattle fed bermudagrass hays of varying nutrient content
- Author
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Juvenal Kanani, A.N. Young, D. Philipp, John A. Jennings, Kenneth P. Coffey, Shane Gadberry, Elizabeth B. Kegley, Charles P. West, and R. T. Rhein
- Subjects
biology ,business.industry ,Research ,Diurnal temperature variation ,Forage ,Cynodon dactylon ,biology.organism_classification ,Biochemistry ,Biotechnology ,Cattle feeding ,Animal science ,Digestibility ,Hay ,Cattle ,Animal Science and Zoology ,Dry matter ,Fecal sampling time ,Internal markers ,Bermudagrass ,Animal nutrition ,business ,Feces ,Food Science - Abstract
Background The effect of time of fecal sampling on the accuracy of acid-detergent insoluble ash (ADIA) and alkaline-peroxide lignin (APL) for the prediction of fecal output (FO) in cattle was evaluated. Eight ruminally cannulated cows (594 ± 35.5 kg) were allocated randomly to 4 bermudagrass [Cynodon dactylon (L.) Pers.] hay diets markedly different in crude protein concentration (79–164 g/kg) with 2 replicates per diet for 3 periods. Cows were offered hay individually at 20 g DM/kg of body weight daily in equal feedings at 08:00 and 16:00 h for a 10-d adaptation period followed by 5-d of total fecal collection. Fecal grab samples also were taken each day during the fecal collection period at 06:00, 12:00, 18:00, and 24:00 h either directly from the rectum or from freshly voided feces. Samples were composited within cow and time across the 5 d total fecal collection period. Additionally, forage, ort, and fecal samples were analyzed for concentrations of APL and ADIA. Results Fecal concentrations of ADIA and APL were not affected by sampling time (P ≥ 0.22), even though diet affected (P
- Published
- 2015
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