TY - JOUR
T1 - Digestibility and Effects of Three Forms of Mostly Saturated Fatty Acids
AU - Elliott, J. P.
AU - Overton, T. R.
AU - Drackley, J. K.
N1 - Funding Information:
Received July 8, 1993. Accepted October 25, 1993. ISupported by Hatch funds appropriated to the Illinois Agricultural Experiment Station (Project Number 35-0352) and by a gift from Milk Specialties Co., Dundee, IL. 2Address correspondence and reprint requests to James K. Drackley. Department of Animal Sciences, University of Illinois, 260 Animal Sciences Laboratory, 1207 West Gregory Drive, Urbana 61801.
PY - 1994
Y1 - 1994
N2 - Four nonlactating Holstein cows fitted with ruminal cannulas were used in a 4 × 4 Latin square design with 14-d periods. Treatments were 1) control, no added fat; 2) 5.0% prilled fatty acids (iodine value = 14); 3) 5.6% prilled hydrogenated tallow (iodine value = 8); and 4) 5.0% flaked fatty acids (iodine value = 14). Diets consisted of alfalfa haylage, corn silage, and concentrate (40:20:40, DM basis). Intake of the TMR (16.4% CP and 25.4% ADF) was restricted to 1.5% of BW so that DMI was similar among diets (9.2 kg/d). Total fatty acid intakes averaged 293, 749, 747, and 686 g/d for treatments 1 to 4, respectively. Digestibilities of total C16, total C18, and total fatty acids were greater for prilled fatty acids than for prilled hydrogenated tallow. Total tract apparent digestibilities of DM, OM, CP, ADF, and NDF did not differ among treatments. Treatments did not affect concentration of total VFA or acetate:propionate ratio in ruminal fluid. Concentration of cholesterol in plasma was lowest when cows were fed the control diet and was greater when cows were fed prilled fatty acids than when they were fed prilled hydrogenated tallow or flaked fatty acids. The three forms of saturated fatty acids did not affect nutrient digestibilities or ruminal fermentation characteristics, but the digestibility of fatty acids in prilled hydrogenated tallow was lower than in prilled fatty acids. Digestibilities of fatty acids and other nutrient fractions and characteristics of ruminal fluid generally were similar between flaked and prilled fatty acids, despite the larger particle size of flaked fatty acids.
AB - Four nonlactating Holstein cows fitted with ruminal cannulas were used in a 4 × 4 Latin square design with 14-d periods. Treatments were 1) control, no added fat; 2) 5.0% prilled fatty acids (iodine value = 14); 3) 5.6% prilled hydrogenated tallow (iodine value = 8); and 4) 5.0% flaked fatty acids (iodine value = 14). Diets consisted of alfalfa haylage, corn silage, and concentrate (40:20:40, DM basis). Intake of the TMR (16.4% CP and 25.4% ADF) was restricted to 1.5% of BW so that DMI was similar among diets (9.2 kg/d). Total fatty acid intakes averaged 293, 749, 747, and 686 g/d for treatments 1 to 4, respectively. Digestibilities of total C16, total C18, and total fatty acids were greater for prilled fatty acids than for prilled hydrogenated tallow. Total tract apparent digestibilities of DM, OM, CP, ADF, and NDF did not differ among treatments. Treatments did not affect concentration of total VFA or acetate:propionate ratio in ruminal fluid. Concentration of cholesterol in plasma was lowest when cows were fed the control diet and was greater when cows were fed prilled fatty acids than when they were fed prilled hydrogenated tallow or flaked fatty acids. The three forms of saturated fatty acids did not affect nutrient digestibilities or ruminal fermentation characteristics, but the digestibility of fatty acids in prilled hydrogenated tallow was lower than in prilled fatty acids. Digestibilities of fatty acids and other nutrient fractions and characteristics of ruminal fluid generally were similar between flaked and prilled fatty acids, despite the larger particle size of flaked fatty acids.
KW - FA
KW - HT
KW - fatty acid
KW - fatty acid digestibility
KW - hydrogenated tallow
KW - hydrogenated tallow
KW - prilled fatty acids
KW - ruminal fermentation
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U2 - 10.3168/jds.S0022-0302(94)77014-4
DO - 10.3168/jds.S0022-0302(94)77014-4
M3 - Article
C2 - 8169287
AN - SCOPUS:0028391511
SN - 0022-0302
VL - 77
SP - 789
EP - 798
JO - Journal of Dairy Science
JF - Journal of Dairy Science
IS - 3
ER -