TY - JOUR ID - 69 TI - Effects of the source of non-fiber carbohydrates on in vitro first order ruminal disappearance kinetics of dry matter and NDF of various feeds JO - Iranian Journal of Veterinary Research JA - IJVR LA - en SN - 1728-1997 AU - Rezaii, F. AU - Danesh Mesgaran, M. AU - Heravi Moussavi, A. AD - Department of Animal Sciences, Excellence Center for Animal Sciences, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran Y1 - 2011 PY - 2011 VL - 12 IS - 3 SP - 222 EP - 229 KW - Disappearance KW - starch KW - Sucrose KW - Rumen fluid DO - 10.22099/ijvr.2011.69 N2 - An in vitro experiment was conducted to study the effect of non-fiber carbohydrates (NFC) on ruminaldisappearance kinetics of dry matter (DM) and neutral detergent fiber (NDF) of alfalfa hay, wheat bran andunmolassed sugar beet pulp. Non-supplemented or NFC supplemented samples [70 mg/g DM of each feedsample as sucrose (SU) or starch (ST) or SU + ST as 1:1] were incubated in bottles containing 40% rumenfluid medium for 4, 8, 16, 24, 48, and 96 h at 39°C. After each incubation time, unfiltered content wasanalysed for DM and NDF. Filtered fluid was analysed for ammonia-N concentration. Kinetic disappearancerate was determined using a first order non-linear model. The source of NFC used in the medium containingalfalfa hay caused a significant decrease in DM disappearance (P<0.01). Feed source, NFC type andincubation time had a significant effect (P<0.01) on NDF disappearance and ammonia-N concentration. Invitro NDF disappearance of unmolassed sugar beet pulp and wheat bran was significantly (P<0.01) decreased by supplementing with ST and SU + ST. The indigestible dry matter fraction of alfalfa hay was significantly increased when it was supplemented by NFC (P<0.05). The rate of DM disappearance of unmolassed sugar beet pulp was also significantly influenced by supplemental NFC (P<0.05). The fractional rate of NDF disappearance of alfalfa hay and wheat bran exhibited an increase (P<0.05) in response to adding NFC when compared with the non-supplemented samples. Generally, the results of the present study suggested that in addition to the amount of supplemental carbohydrate fed, the source of supplemental carbohydrate and the basal feed sources might be effective on the effect of supplemental NFC on fiber utilization. UR - https://ijvr.shirazu.ac.ir/article_69.html L1 - https://ijvr.shirazu.ac.ir/article_69_ce97c4742fcd7e565f1c3076759dbdf9.pdf ER -