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Concentrations of retinol and tocopherols in the milk of cows supplemented with conjugated linoleic acid.
J Anim Physiol Anim Nutr (Berl). 2015 Dec; 99(6):1039-46.JA

Abstract

This study was performed to investigate the hypothesis that supplementation of conjugated linoleic acid (CLA) changes the concentrations of retinol and tocopherols in the milk of cows. To investigate this hypothesis, Holstein cows received daily from 3 weeks ante-partum to 14 weeks post-partum either 172 g of a CLA-free rumen-protected control fat (control group, n = 20) or the same amount of a rumen-protected CLA fat, supplying 4.3 g of cis-9, trans-11 CLA and 3.8 g of trans-10, cis-12 CLA per d (CLA group, n = 20). Milk samples (collected at weeks 1, 3, 5, 8 and 11 of lactation) were analysed for retinol, α- and γ-tocopherol concentrations. Milk of cows supplemented with CLA had higher concentrations of retinol (+34%), α-tocopherol (+44%) and γ-tocopherol (+21%) than milk of control cows (p < 0.05). The daily output of these vitamins via milk was also greater in cows of the CLA group than in cows of the control group (+36, 50 and 24% for retinol, α-tocopherol and γ-tocopherol, respectively, p < 0.05). In agreement with higher concentrations of tocopherols, concentrations of thiobarbituric acid-reactive substances, determined in milk of week 5, were lower in cows of the CLA group than in control cows, indicative of a lower susceptibility of milk lipids to peroxidation. Plasma concentrations of retinol and α-tocopherol, determined at 1 and 5 weeks post-partum, were not different between the two groups of cows. In conclusion, this study shows that supplementing dairy cows with a moderate amount of CLA causes an increase of the concentrations of vitamins A and E in the milk and results in an increased output of those vitamins via milk. These effects might be beneficial with respect to the nutritional value of dairy products and the susceptibility of milk fat to oxidative deterioration.

Authors+Show Affiliations

Institute of Animal Nutrition and Nutrition Physiology, Justus-Liebig-University Giessen, Giessen, Germany.Institute of Animal Nutrition and Nutrition Physiology, Justus-Liebig-University Giessen, Giessen, Germany.Institute of Animal Nutrition and Nutrition Physiology, Justus-Liebig-University Giessen, Giessen, Germany.Institute of Animal Nutrition and Nutrition Physiology, Justus-Liebig-University Giessen, Giessen, Germany.Chair of Animal Nutrition, Center of Life and Food Sciences Weihenstephan, Technische Universität München, Freising-Weihenstephan, Germany.Institute of Animal Nutrition and Nutrition Physiology, Justus-Liebig-University Giessen, Giessen, Germany.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25846729

Citation

Gessner, D K., et al. "Concentrations of Retinol and Tocopherols in the Milk of Cows Supplemented With Conjugated Linoleic Acid." Journal of Animal Physiology and Animal Nutrition, vol. 99, no. 6, 2015, pp. 1039-46.
Gessner DK, Most E, Schlegel G, et al. Concentrations of retinol and tocopherols in the milk of cows supplemented with conjugated linoleic acid. J Anim Physiol Anim Nutr (Berl). 2015;99(6):1039-46.
Gessner, D. K., Most, E., Schlegel, G., Kupczyk, K., Schwarz, F. J., & Eder, K. (2015). Concentrations of retinol and tocopherols in the milk of cows supplemented with conjugated linoleic acid. Journal of Animal Physiology and Animal Nutrition, 99(6), 1039-46. https://doi.org/10.1111/jpn.12325
Gessner DK, et al. Concentrations of Retinol and Tocopherols in the Milk of Cows Supplemented With Conjugated Linoleic Acid. J Anim Physiol Anim Nutr (Berl). 2015;99(6):1039-46. PubMed PMID: 25846729.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Concentrations of retinol and tocopherols in the milk of cows supplemented with conjugated linoleic acid. AU - Gessner,D K, AU - Most,E, AU - Schlegel,G, AU - Kupczyk,K, AU - Schwarz,F J, AU - Eder,K, Y1 - 2015/04/07/ PY - 2014/08/19/received PY - 2015/03/06/accepted PY - 2015/4/8/entrez PY - 2015/4/8/pubmed PY - 2016/8/17/medline KW - conjugated linoleic acid KW - dairy cow KW - milk KW - retinol KW - tocopherols SP - 1039 EP - 46 JF - Journal of animal physiology and animal nutrition JO - J Anim Physiol Anim Nutr (Berl) VL - 99 IS - 6 N2 - This study was performed to investigate the hypothesis that supplementation of conjugated linoleic acid (CLA) changes the concentrations of retinol and tocopherols in the milk of cows. To investigate this hypothesis, Holstein cows received daily from 3 weeks ante-partum to 14 weeks post-partum either 172 g of a CLA-free rumen-protected control fat (control group, n = 20) or the same amount of a rumen-protected CLA fat, supplying 4.3 g of cis-9, trans-11 CLA and 3.8 g of trans-10, cis-12 CLA per d (CLA group, n = 20). Milk samples (collected at weeks 1, 3, 5, 8 and 11 of lactation) were analysed for retinol, α- and γ-tocopherol concentrations. Milk of cows supplemented with CLA had higher concentrations of retinol (+34%), α-tocopherol (+44%) and γ-tocopherol (+21%) than milk of control cows (p < 0.05). The daily output of these vitamins via milk was also greater in cows of the CLA group than in cows of the control group (+36, 50 and 24% for retinol, α-tocopherol and γ-tocopherol, respectively, p < 0.05). In agreement with higher concentrations of tocopherols, concentrations of thiobarbituric acid-reactive substances, determined in milk of week 5, were lower in cows of the CLA group than in control cows, indicative of a lower susceptibility of milk lipids to peroxidation. Plasma concentrations of retinol and α-tocopherol, determined at 1 and 5 weeks post-partum, were not different between the two groups of cows. In conclusion, this study shows that supplementing dairy cows with a moderate amount of CLA causes an increase of the concentrations of vitamins A and E in the milk and results in an increased output of those vitamins via milk. These effects might be beneficial with respect to the nutritional value of dairy products and the susceptibility of milk fat to oxidative deterioration. SN - 1439-0396 UR - https://www.unboundmedicine.com/medline/citation/25846729/Concentrations_of_retinol_and_tocopherols_in_the_milk_of_cows_supplemented_with_conjugated_linoleic_acid_ L2 - https://doi.org/10.1111/jpn.12325 DB - PRIME DP - Unbound Medicine ER -