The objective of this study was to investigate what effects of infusing various stearic acid(C18∶0)，oleic acid(C18∶1), linoleic acid (C18∶2) and linolenic acid(C18∶3) into duodenum would have on the following blood parameters of dairy cows: fatty acids composition, biochemical and oxidation indices. A 5×5 Latin design was used in this experiment. Five multiparous Holstein cows [(140±7) DIM] with permanent duodenum cannulas were infused in duodenum with a mixture of [154 g/(d·head) C18∶0+216 g/(d·head) C18∶1+18 g/(d·head) C18∶2+12 g/(d·head) C18∶3] (treatment 1), [154 g/(d·head) C18∶0+216 g/(d·head) C18∶1+18 g/(d·head) C18∶2] (treatment 2)，[154 g/(d·head) C18∶0+216 g/(d·head) C18∶1+12 g/(d·head) C18∶3] (treatment 3)，[154 g/(d·head) C18∶0+18 g/(d·head) C18∶2+12 g/(d·head) C18∶3] (treatment 4) and [216 g/(d·head) C18∶1+18 g/(d·head) C18∶2+12 g/(d·head) C18∶3] (treatment 5). Compared with treatment 1, treatment 4 decreased the concentration of C18∶1 numerically by 46% in blood, and caused the concentrations of C18∶3 and polyunsaturated fatty acid increased (P<0.05); the percentage of C18∶3 decreased in blood when treatment 2 was infused (P<0.05); whereas treatment 3 and treatment 5 showed no influence on percentages of C18∶2 and C18∶0 or other 18C fatty acids in blood (P>0.05). Blood biochemical indices were not observed to be significant differences among the 5 treatments (P>0.05). Index of peroxidation (IP) increased when the percentage of C18∶3 increased in blood (P<0.05), whereas other anti-oxidant indexes had no significant differences among the 5 treatments (P>0.05). These results indicate that C18∶3 content are more sensitive to exogenous fatty acids and their composition compared with other 18C fatty acids in blood of dairy cows. The changes of fatty acids composition in blood can not significantly influence blood biochemical and oxidative indices.［Chinese Journal of Animal Nutrition, 2011, 23（7）：1123 -1129］
CUI Hai,WANG Jiaqi,LI Fadi,BU Dengpan,KHAS-ERDENE,LIU Qingsheng,ZHOU Lingyun
. Effects of Duodenally Infused 18-Carbon Fatty Acids on Blood Fatty Acid Composition, Blood Biochemical Indices and Their
Susceptibility to Peroxidation in Lactating Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2011
, 23(07)
: 1123
-1129
.
DOI: 10.3969/j.issn.1006-267x.2011.07.009
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