Abstract
The objective of this study was to investigate the effect of dietary supplementation with calcium salts of soybean oil fatty acids (CaSO) and linseed oil fatty acids (CaLO) on c9,tl 1-CLA production in ruminal fluid and milk fat from Holstein dairy cows. Rumen fermentation, lactational performances and fatty acid profiles in ruminal fluid and milk fat were also investigated. Twenty multiparous Holstein dairy cows were allotted randomly into two groups consisting often cows in each group according to calving date and average milk yield. The first group of cows was fed a control (without calcium salts) diet and a treatment as 1.0% of CaSO (on DM basis) for 30 days in each period. In the second group, cows were fed the same control diet and 1.0% of CaLO as a treatment in the same manner. The forage: concentrate ratio was 52:48, and diets were formulated to contain 17% crude protein (DM basis) for both groups. Ruminal pH, protozoal numbers and the concentration of total volatile fatty acids were unchanged, however, the ruminal ammonia-N decreased by feeding CaSO or CaLO treatment compared to the control diet. The vaccenic acid (trans-11 C18:1; VA) in rumen fluid increased (p<0.01) by 169% and 153%, and the c9,t11-CLA content of rumen fluid increased (p<0.01) by 214% and 210% in the CaSO and CaLO treatments, respectively, compared to the control diet. In milk fatty acids, the VA content increased by 130% and 132% in the evening and morning milking times, respectively, and the c9,t11-CLA content increased by 125% in both milking times for the CaSO supplementation than that of control diet. In the case of CaLO supplementation, the VA increased by 117% and 114%, and the c9,tll-CLA increased by 96% and 94% in the evening and morning milking times, respectively, compared to the control diet. The contents of VA and c9,t11-CLA of milk fatty acids were numerically higher in the evening milking time compared to the morning milking time for control and both treatments. Finally, these results indicated that the supplementation of CaSO or CaLO treatment increased the VA and the c9,t11-CLA in both ruminal fluid and milk fat of Holstein dairy cows.
Highlights
Conjugated linoleic acid (CLA) is a mixture of positional and geometric isomers of octadecadienoic acid (C18:2) with conjugated double bonds, and the principal dietary sources of CLA are dairy products and other foods derived from ruminant animals (Chin et al, 1992)
Two trials were conducted for two treatments; the calcium salt of soybean oil fatty acid (CaSO) and the calcium salt of linseed oil fatty acid (CaLO) using two groups of cows
Previous studies (Wu et al, 1991; Chouinard et al, 1998) found the lack of an effect on Dry matter intake (DMI) fed Ca salts of fatty acid (FA), which possessed the acceptability of the diets
Summary
Conjugated linoleic acid (CLA) is a mixture of positional and geometric isomers of octadecadienoic acid (C18:2) with conjugated double bonds, and the principal dietary sources of CLA are dairy products and other foods derived from ruminant animals (Chin et al, 1992). CLA has been the focus of considerable research efforts due to its potential health-promoting properties associated with its anticarcinogenic properties (Ha et al, 1987; Ha et al, 1990; Ip et al, 1991), antiatherogenic in rabbits (Lee et al, 1994) and hamsters (Nicolosi et al, 1997), an antidiabetic (Houseknecht et al, 1998), affecting. In view of the potential benefits to human health, there. Sci. 21(9):1262-1270 (CaLO) diets Item Diet Control CaSO CaLO % of DM Corn silage
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