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Short Communication: Milk Fat Response to Low Doses of trans-10, cis-12 Conjugated Linoleic Acid (CLA)^1,2

Department of Animal Science Cornell University Ithaca, NY 14853

Corresponding author:
D. E. Bauman; e-mail:
deb6{at}cornell.edu.

	ABSTRACT

TOP ABSTRACT INTRODUCTION REFERENCES

 
Trans-10, cis-12 conjugated linoleic acid (CLA) is a potent inhibitor of milk fat synthesis. We examined the effect of low doses of trans-10, cis-12 CLA using Holstein cows in a 4 x 4 Latin square design. Milk yield and milk protein were unaffected, but abomasal infusion of 1.25, 2.5, and 5.0 g/d of trans-10, cis-12 CLA reduced milk fat yield by 7, 16, and 29%, respectively. When combined with previous data, the reduction in milk fat yield was curvilinear, relating to both quantity infused and milk fat content of trans-10, cis-12 CLA (R² = 0.99 and 0.96, respectively). Further, changes in milk fatty acid composition indicated the mechanism involved inhibition of de novo fatty acid synthesis and the utilization of circulating fatty acids.

Key Words: conjugated linoleic acid • lipogenesis • milk fat depression

Abbreviation key: CLA = conjugated linoleic acid

	INTRODUCTION

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Conjugated linoleic acids (CLA) are fatty acids found in food products derived from ruminants. Many positional and geometric isomers exist, and CLA studies with animal models have demonstrated a diverse range of beneficial health effects (Pariza et al., 2001). One effect is on nutrient partitioning or more specifically, reduced milk fat synthesis in lactating animals (Bauman et al., 2001) and body fat accretion in growing animals (Jahreis et al., 2000). The decrease in milk fat is caused by trans-10, cis-12 CLA (Baumgard et al., 2000), and this isomer has also been implicated in diet-induced milk fat depression (Bauman and Griinari, 2001). Baumgard et al. (2001) recently investigated abomasally infused trans-10, cis-12 CLA and observed a 25 to 50% reduction in milk fat yield over the dose range of 3.5 to 14.0 g/d. The present study was conducted to extend this response relationship to lower doses.

Procedures involving animals were approved by the Cornell University Institutional Animal Care and Use Committee. Lactating Holstein dairy cows (n = 4; 3 primiparous, 1 multiparous) fitted with rumen fistulas were randomly assigned to a 4 x 4 Latin square experiment. Cows were housed in tie stalls in an environmentally controlled room with artificial ventilation and 24-h lighting. Cows were fed a TMR consisting mainly of legume and mixed hay and cracked corn that was formulated to meet or exceed predicted nutrient requirements (NRC, 1989), and chemical composition was similar to our previous study (Baumgard et al., 2001). Cows were fed ad libitum and water was available at all times.

Treatments were formulated to deliver 0, 1.25, 2.50, and 5.00 g/d of trans-10, cis-12 CLA based on a relatively pure CLA supplement (Natural Lipids, Hovdebygda, Norway), which contained 89.3% trans-10, cis-12 CLA. For each experimental period, the CLA supplement was emulsified in skim milk using a microfluidizer (Chouinard et al., 1999), to an initial concentration of 2% trans-10, cis-12 CLA and then diluted to provide the CLA dose in a volume of 720 ml/d. Infusates passed through the rumen fistula and sulcus omasi into the abomasum via a 0.5-cm (i.d.) polyvinyl chloride tube and were infused in equal portions every 4 h (6x/d) for 5 d with a 7-d interval between periods.

Cows were milked at 0600 and 1800 h and yield recorded. One sample of milk was stored at 4°C with a preservative (bronopol tablet; DF Control System, San Ramon, CA) until analyzed for fat and protein by infrared analysis (Dairy One Cooperative, Inc., Ithaca, NY). A second milk aliquot was stored at –20°C until analyzed for fatty acid composition by gas chromatography as previously described (Baumgard et al., 2001).

Data were analyzed as a 4 x 4 Latin square design using the PROC MIXED procedure of SAS (SAS Institute, Cary, NC) according to the model:

where Y_ijk is the individual observation, µ is the overall mean, D_i is the effect of dose (i = 1, 2, 3, and 4), P_j is the effect of period (j = 1, 2, 3, and 4; treated as a random effect), C_k is the effect of cow (k = 1, 2, 3, and 4; treated as a random effect) and _ijk is the residual error term. No significant period effects were observed. Regression analyses were performed using the PROC REG procedure of SAS (SAS Institute).

Performance variables are presented in Table 1. There were no differences among treatments in DMI, milk yield, or milk protein. In contrast, fat percent and yield were reduced in a dose-dependent manner with infusion of trans-10, cis-12 CLA. Effects on milk fatty acid composition provide information on the mechanism by which milk fat synthesis is inhibited. Fatty acids <C₁₆ are synthesized de novo, while fatty acids > C₁₆ arise from uptake of circulating fatty acids and C₁₆ fatty acids originate from both sources. In the present study, the reduction in de novo synthesized and preformed fatty acids contributed similarly (molar basis) to the reduction in milk fat across all doses of trans-10, cis-12 CLA (Figure 1). This was also observed by Baumgard et al. (2001) with infusion of 3.5 g/d trans-10, cis-12 CLA, but they found more pronounced effects on de novo synthesis at higher doses (7, 10, 14 g/d). In addition, we observed no effects of trans-10, cis-12 CLA on the ratios for fatty acids that represent product/substrate pairs for ⁹-desaturase (data not shown); Baumgard et al. (2001) also observed no effect for their lower dose of trans-10, cis-12 CLA (3.5 g/d), but higher doses (7 and 14 g/d) altered the ratios in a manner indicating this CLA isomer reduced ⁹-desaturase activity. By combining data from different studies, a more complete dose-response curve for the effects of trans-10, cis-12 CLA on milk fat synthesis can be generated. Figure 2 shows the close curvilinear relationship between trans-10, cis-12 CLA dose (g/d) and the corresponding percent reduction in milk fat yield (R² = 0.99; P < 0.001) when data from the present study are combined with two earlier studies (Baumgard et al., 2000; 2001). Trans-10, cis-12 CLA is also transferred to milk fat and Figure 3 demonstrates a similar relationship between milk fat content of trans-10, cis-12 CLA, and the corresponding decrease in milk fat yield (R² = 0.96; P < 0.001).

View larger version (22K): [in this window] [in a new window]   Figure 1. Molar reduction of milk fatty acids from cows receiving trans-10, cis-12 conjugated linoleic acid (CLA) at 1.25, 2.50, and 5.00 g/d via abomasal infusion. Values represent means (n = 4) of d 5 of infusion. Fatty acids are categorized according to origin; < C16 represent de novo synthesized fatty acids, > C16 represent preformed fatty acids taken up from circulation, and C16 fatty acids are derived from both sources. To determine the mmol yield of fatty acids, we first calculated yield on a mass basis by multiplying the concentration of each fatty acid in milk fat by the milk fat yield adjusted for triglyceride-glycerol as described by Schauff et al. (1992). Yield on a mass basis was then divided by the molecular weight of each individual fatty acid to calculate yield on a molar basis. SE for < C16, C16, and > C16 fatty acid groups averaged 10% across all treatments.

View larger version (12K): [in this window] [in a new window]   Figure 2. Relationship between the decrease in milk fat yield and dose of trans-10, cis-12 conjugated linoleic acid (CLA) abomasally infused into lactating dairy cows. Triangle symbols represent the values from the present study, circles represent values from Baumgard et al. (2001) and the square represents data from Baumgard et al. (2000). All values represent the mean (n = 4) of d 5 of infusion.

View larger version (13K): [in this window] [in a new window]   Figure 3. Relationship between the decrease in milk fat yield and milk fat content of trans-10, cis-12 conjugated linoleic acid (CLA) during abomasal infusion into lactating dairy cows. Triangle symbols represent the values from the present study, circles represent values from Baumgard et al. (2001) and the square represents data from Baumgard et al. (2000). All values represent the mean (n = 4) of d 5 of infusion.

	FOOTNOTES

 
¹ Supported in part by National Dairy Council (Rosemount, IL), Northeast Dairy Foods Research Center and Cornell Agricultural Experiment Station.

² The authors gratefully acknowledge the support and assistance of A. Sæbo, S. Bean, D. Ceurter, B. Corl, D. Dwyer, W. English, M. Madron, and A. Ziegler.

³ Present address: 228 Shantz, Department of Animal Sciences, University of Arizona.

Received for publication December 6, 2001. Accepted for publication February 19, 2002.

	REFERENCES

TOP ABSTRACT INTRODUCTION REFERENCES

 


Bauman, D. E., and J. M. Griinari. 2001. Regulation and nutritional manipulation of milk fat: Low-fat milk syndrome. Livest. Prod. Sci. 70:15–29.

Bauman, D. E., B. A. Corl, L. H. Baumgard, and J. M. Griinari. 2001. Conjugated linoleic acid (CLA) and the dairy cow. Pages 221–250 in Recent Advances in Animal Nutrition-2001. P. C. Garnsworthy and J. Wiseman, eds. Nottingham University Press, Nottingham, UK.

Baumgard, L. H., B. A. Corl, D. A. Dwyer, A. Saebø, and D. E. Bauman. 2000. Identification of the conjugated linoleic acid isomer that inhibits milk fat synthesis. Am. J. Physiol. 278:R179–R184.

Baumgard, L. H., J. K. Sangster, and D. E. Bauman. 2001. Milk fat synthesis in dairy cows is progressively reduced by increasing supplemental amounts of trans-10, cis-12 conjugated linoleic acid (CLA). J. Nutr. 131:1764–1769.[Abstract/Free Full Text]

Baumgard, L. H., E. Matitashvili, B. A. Corl, D. A. Dwyer, and D. E. Bauman. 2002. trans-10, cis-12 CLA decreases lipogenic rates and expression of genes involved in milk lipid synthesis in dairy cows. J. Dairy Sci. (accepted)

Chouinard, P. Y., L. Corneau, D. M. Barbano, L. E. Metzger, and D. E. Bauman. 1999. Conjugated linoleic acids alter milk fatty acid composition and inhibit milk fat secretion in dairy cows. J. Nutr. 129:1579–1584.[Abstract/Free Full Text]

Jahreis, G., J. Kraft, F. Tischendorf, F. Schone, and C. von Loeffelholz. 2000. Conjugated linoleic acids: physiological effects in animal and man with special regard to body composition. Eur. J. Lipid Sci. Technol. 102:695–703.

National Research Council. 1989. Nutrient Requirements of Dairy Cattle. 6th rev. ed. Natl. Acad. Sci., Washington, DC.

Pariza, M. W., Y. Park, and M. E. Cook. 2001. The biologically active isomers of conjugated linoleic acid. Prog. Lipid Res. 40:283–298.[Medline]

Schauff, D. J., J. H. Clark, and J. K. Drackley. 1992. Effects of feeding lactating dairy cows diets containing extruded soybeans and calcium salts of long-chain fatty acids. J. Dairy Sci. 75:3003–3019.[Abstract]

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