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Effects of dietary supplementation of rumen-protected conjugated linoleic acid to grazing cows in early lactation.
J Dairy Sci. 2010 Mar; 93(3):1126-37.JD

Abstract

Conjugated linoleic acids (CLA) are potent anticarcinogens in animal and in vitro models as well as inhibitors of fatty acid synthesis in mammary gland, liver, and adipose tissue. Our objective was to evaluate long-term CLA supplementation of lactating dairy cows in tropical pasture on milk production and composition and residual effects posttreatment. Thirty crossbred cows grazing stargrass (Cynodon nlemfuensis Vanderyst var. nlemfüensis) were blocked by parity and received 150 g/d of a dietary fat supplement of either Ca-salts of palm oil fatty acids (control) or a mixture of Ca-salts of CLA (CLA treatment). Supplements of fatty acids were mixed with 4 kg/d of concentrate. Grazing plus supplements were estimated to provide 115% of the estimated metabolizable protein requirements from 28 to 84 d in milk (treatment period). The CLA supplement provided 15 g/d of cis-9,trans-11 and 22g of cis-10,trans-12. Residual effects were evaluated from 85 to 112 d in milk (residual period) when cows were fed an 18% crude protein concentrate without added fat. The CLA treatment increased milk production but reduced milk fat concentration from 2.90 to 2.14% and fat production from 437 to 348 g/d. Milk protein concentration increased by 11.5% (2.79 to 3.11%) and production by 19% (422 to 504 g/d) in the cows fed CLA. The CLA treatment decreased milk energy concentration and increased milk volume, resulting in unchanged energy output. Milk production and protein concentration and production were also greater during the residual period for the CLA-treated cows. The CLA treatment reduced production of fatty acids (FA) of all chain lengths, but the larger effect was on short-chain FA, causing a shift toward a greater content of longer chain FA. The CLA treatment increased total milk CLA content by 30% and content of the trans-10,cis-12 CLA isomer by 88%. The CLA treatment tended to decrease the number of days open, suggesting a possible effect on reproduction. Under tropical grazing conditions, in a nutritionally challenging environment, CLA-treated cows decreased milk fat content and secreted the same amount of milk energy by increasing milk volume and milk protein production.

Authors+Show Affiliations

Embrapa Beef Cattle, Campo Grande, Mato Grosso do Sul, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

20172234

Citation

Medeiros, S R., et al. "Effects of Dietary Supplementation of Rumen-protected Conjugated Linoleic Acid to Grazing Cows in Early Lactation." Journal of Dairy Science, vol. 93, no. 3, 2010, pp. 1126-37.
Medeiros SR, Oliveira DE, Aroeira LJ, et al. Effects of dietary supplementation of rumen-protected conjugated linoleic acid to grazing cows in early lactation. J Dairy Sci. 2010;93(3):1126-37.
Medeiros, S. R., Oliveira, D. E., Aroeira, L. J., McGuire, M. A., Bauman, D. E., & Lanna, D. P. (2010). Effects of dietary supplementation of rumen-protected conjugated linoleic acid to grazing cows in early lactation. Journal of Dairy Science, 93(3), 1126-37. https://doi.org/10.3168/jds.2009-2645
Medeiros SR, et al. Effects of Dietary Supplementation of Rumen-protected Conjugated Linoleic Acid to Grazing Cows in Early Lactation. J Dairy Sci. 2010;93(3):1126-37. PubMed PMID: 20172234.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of dietary supplementation of rumen-protected conjugated linoleic acid to grazing cows in early lactation. AU - Medeiros,S R, AU - Oliveira,D E, AU - Aroeira,L J M, AU - McGuire,M A, AU - Bauman,D E, AU - Lanna,D P D, PY - 2009/08/14/received PY - 2009/11/09/accepted PY - 2010/2/23/entrez PY - 2010/2/23/pubmed PY - 2010/4/30/medline SP - 1126 EP - 37 JF - Journal of dairy science JO - J Dairy Sci VL - 93 IS - 3 N2 - Conjugated linoleic acids (CLA) are potent anticarcinogens in animal and in vitro models as well as inhibitors of fatty acid synthesis in mammary gland, liver, and adipose tissue. Our objective was to evaluate long-term CLA supplementation of lactating dairy cows in tropical pasture on milk production and composition and residual effects posttreatment. Thirty crossbred cows grazing stargrass (Cynodon nlemfuensis Vanderyst var. nlemfüensis) were blocked by parity and received 150 g/d of a dietary fat supplement of either Ca-salts of palm oil fatty acids (control) or a mixture of Ca-salts of CLA (CLA treatment). Supplements of fatty acids were mixed with 4 kg/d of concentrate. Grazing plus supplements were estimated to provide 115% of the estimated metabolizable protein requirements from 28 to 84 d in milk (treatment period). The CLA supplement provided 15 g/d of cis-9,trans-11 and 22g of cis-10,trans-12. Residual effects were evaluated from 85 to 112 d in milk (residual period) when cows were fed an 18% crude protein concentrate without added fat. The CLA treatment increased milk production but reduced milk fat concentration from 2.90 to 2.14% and fat production from 437 to 348 g/d. Milk protein concentration increased by 11.5% (2.79 to 3.11%) and production by 19% (422 to 504 g/d) in the cows fed CLA. The CLA treatment decreased milk energy concentration and increased milk volume, resulting in unchanged energy output. Milk production and protein concentration and production were also greater during the residual period for the CLA-treated cows. The CLA treatment reduced production of fatty acids (FA) of all chain lengths, but the larger effect was on short-chain FA, causing a shift toward a greater content of longer chain FA. The CLA treatment increased total milk CLA content by 30% and content of the trans-10,cis-12 CLA isomer by 88%. The CLA treatment tended to decrease the number of days open, suggesting a possible effect on reproduction. Under tropical grazing conditions, in a nutritionally challenging environment, CLA-treated cows decreased milk fat content and secreted the same amount of milk energy by increasing milk volume and milk protein production. SN - 1525-3198 UR - https://www.unboundmedicine.com/medline/citation/20172234/Effects_of_dietary_supplementation_of_rumen_protected_conjugated_linoleic_acid_to_grazing_cows_in_early_lactation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-0302(10)00081-0 DB - PRIME DP - Unbound Medicine ER -