|Baldwin, Ransom - Randy|
Submitted to: Journal of Animal Science
Publication Type: Abstract Only
Publication Acceptance Date: 5/14/2002
Publication Date: 7/15/2002
Citation: BALDWIN, R.L., MCLEOD, K., CAPUCO, A.V., SOLOMON, M.B., HARMON, D. INFLUENCE OF RUMINAL AND POSTRUMINAL CARBOHYDRATE INFUSION ON VISCERAL ORGAN MASS AND ADIPOSE TISSUE ACCRETION IN GROWING BEEF STEERS. JOURNAL OF ANIMAL SCIENCE. 2002.
Technical Abstract: Forty beef steers (243 ± 2 kg BW) with ruminal and abomasal infusion catheters were used to determine the effects of site of carbohydrate (CHO) digestion on visceral organ mass and adipose accretion. Treatments included a pelleted basal diet fed at 0.162 (LE) or 0.215 Mcal ME/kg BW.75/d, LE plus ruminal (RSH) or abomasal (ASH) infusion of starch, and abomasal infusion of glucose (AGLU). Starch and glucose were infused at rates of 12.6 and 14.4g/kg BW.75/d , respectively, or 20% of MEI. After 35 d of infusion, steers were slaughtered and visceral organ and adipose mass were determined and subcutaneous adipose thickness over the 5th and 12th rib was measured. Total intake energy (IE) was greater for HE vs LE. Total IE was similar among CHO infusion treatments, however infused IE was greater for AGLU vs ASH (54 vs 51 kcal/kg BW.75/d). Weight:EBW of rumen, omasum, total stomach-complex, and pancreas weight were greater for HE vs LE. RSH increased rumen and pancreas weights:EBW compared with either LE or ASH. Dietary IE did not effect adipose accretion on an EBW basis, however AGLU increased omental and total visceral adipose weights compared with either LE or ASH. There was a trend for increased adiposity with CHO infusion compared with LE (AGLU > ASH > RSH). Increasing CHO supply ruminally appears to stimulate ruminal tissue proliferation, while increasing supply abomasally does not alter intestinal mass. Moreover, AGLU stimulated adiposity to a greater extent than ASH.