Infusion of Four Long-chain Fatty Acid Mixtures into the Abomasum of Lactating Dairy Cows

Abstract

Five Holstein cows were utilized in a Latin square design to determine the effects of postruminal profile of fatty acids on DMI, milk yield and composition, nutrient digestibilities, and metabolites in blood. Treatments were abomasal infusions of 1) control, 169 to 180 g/d of meat solubles; 2) control plus 450 g/d of mostly saturated fatty acids; 3) canola fatty acids; 4) soybean fatty acids; or 5) sunflower fatty acids. Infusion of fatty acids decreased intakes of DM, CP, and gross energy; yields of milk, FCM, SNF, total solids, CP, NPN, true protein, whey protein, and casein; and percentages of SNF, CP, NPN, true protein, and casein in milk. Cows infused with mostly saturated fatty acids consumed more CP and digestible energy; yielded more milk, FCM, fat, SNF, total solids, CP, true protein, and casein; and had greater percentages of SNF and total solids in milk than cows infused with unsaturated fatty acids. Milk fatty acids reflected the profile of the infused fatty acid mixture. Ruminal characteristics and apparent digestibilities of DM, NDF, energy, and fatty acids generally were not different among treatments. The profile of fatty acids reaching the small intestine may influence responses when supplemental fats are fed to lactating dairy cows.

Effects of Different Fat Sources on Fermentative Characteristics and Microbial Efficiency in the Rumen, and Nutrients Digestibility of Dairy Cows

“…Therefore, this suggest that forage proportion in the 2) NS, not significant(P > 0.05); * P < 0.05; ** P < 0.01 --352 diet could affect nutrient digestibility in the rumen. DM The duodenal infusion of linseed oil had no effect on DM digestibility, in agreement with previous studies involving abomasal infusions of fat (Christensen et al, 1994;Drackley et al, 1992;Oldick et al, 1997).…”

A high-MUFA diet alone does not affect ketone body metabolism, but reduces glycated hemoglobin when combined with exercise training in diabetic rats

“…In line with some previous studies in dairy cows [24,25], rats fed diets high in SFA and MUFA tended to consume fewer calories than those fed a regular diet. Mechanisms involved in fat-induced depression of food intake have been proposed to include the reducing equivalents produced by fatty acid oxidation [26], feedback satiety signals [27], and increased post-feeding satiety hormones such as plasma cholecystokinin and pancreatic polypeptide concentrations [28].…”

Ruminant milk fat plasticity: nutritional control of saturated, polyunsaturated, trans and conjugated fatty acids

“…Furthermore, a large decrease in the percentage of butyric acid in milk fat was observed with high concentrate diets, although ruminal butyric acid percentage [31,33]). Furthermore, the proportion of C4:0, C6:0 and C8:0-FA was hardly changed by the addition of protected fat or by the duodenal infusion of fat (see also [41,55]). This is in agreement with the observation that body fat mobilisation increased C18:0 and C18:1 in milk fat at the expense of C10:0 to C16:0-FA without significantly decreasing the C4:0 to C8:0-FA [22,30,43,135].…”

“…This amount can be increased by the use of feeds rich in PUFA and by factors which decrease their 189 Figure 3. Transfer efficiency [milk C18:2 (treated-control) / infused C18:2] into milk of linolenic acid infused into the abomasum or the duodenum of the dairy cow (from [32,41,55,63,100,118,125,141]). …”