Diurnal variation in fecal concentrations of acid-detergent insoluble ash and alkaline-peroxide lignin from cattle fed bermudagrass hays of varying nutrient content.

Autor: Kanani J; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA., Philipp D; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA., Coffey KP; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA., Kegley EB; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA., West CP; Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409 USA., Gadberry S; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA., Jennings J; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA., Young AN; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA., Rhein RT; Division of Agriculture, University of Arkansas, Fayetteville, AR 72701 USA.
Jazyk: angličtina
Zdroj: Journal of animal science and biotechnology [J Anim Sci Biotechnol] 2015 Jun 02; Vol. 6 (1), pp. 24. Date of Electronic Publication: 2015 Jun 02 (Print Publication: 2015).
DOI: 10.1186/s40104-015-0024-1
Abstrakt: 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 < 0.01) fecal ADIA and APL concentrations. There were no diet × sampling time interactions (P ≥ 0.60). Estimates of FO and dry matter digestibility (DMD) from ADIA and APL were not affected (P ≥ 0.16) by sampling time or the diet × sampling time interaction (P ≥ 0.74). Estimates of FO and DMD from markers from different sampling times or all different combinations of sampling time were not different (P ≥ 0.72) from those of total collection among internal markers.
Conclusion: Little variation in concentrations of ADIA and APL in daily fecal excretion across time increases flexibility in fecal grab sampling schedules for predicting FO and DMD.
Databáze: MEDLINE
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