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Effects of dietary conjugated linoleic acid on production and metabolic parameters in transition dairy cows grazing fresh pasture.
J Dairy Res. 2006 Aug; 73(3):367-77.JD

Abstract

Supplementation with a high dose (600 g/d) of rumen inert conjugated linoleic acids (RI-CLA) inhibits milk fat synthesis in total mixed ration (TMR)-fed dairy cows immediately post partum. However, effects of RI-CLA on milk fat and bioenergetic parameters during the transition period in grazing cows have not been investigated. Multiparous Holstein cows (n=39) grazing pasture were randomly assigned to one of three treatments: (1) pasture (PAS), (2) PAS+540 g/d Hyprofat (palm oil; HYPRO) and (3) PAS+600 g/d RI-CLA. HYPRO and RI-CLA supplements were isoenergetic, fed twice daily at 7.00 and 16.00 and provided 0 and 125 g CLA/d, respectively. Treatments began 27+/-10 d prepartum and continued until 36+/-1 days in milk (DIM). There was little or no overall effect of RI-CLA on content or yield of milk protein and lactose. RI-CLA supplementation decreased overall milk fat content and yield with RI-CLA-induced milk fat depression (MFD) becoming significant by day 3 when compared with PAS and by day 6 when compared with HYPRO. MFD continued to increase in severity during the first 24 d post partum after which MFD reached a plateau (approximately 40%; RI-CLA v. HYPRO). Pasture-fed cows produced less milk (19.4 kg/d) than the lipid-supplemented groups and although there were no overall differences in milk yield between RI-CLA and HYPRO (22.3 kg/d) a curvilinear relationship (R2=0.57) existed between the RI-CLA-induced milk yield response and extent of MFD. RI-CLA tended to increase milk yield (1.8 kg/d) compared with HYPRO until MFD exceeded 35% (approximately day 21), after which point the positive milk yield response was eliminated. Milk fat trans-10, cis-12 CLA content averaged 0.25 g/100 g in the RI-CLA treatment, was temporally independent, and was undetectable in PAS and HYPRO treatments. Based on the milk fat 14ratio1/14ratio0 ratio, RI-CLA decreased the overall Delta9-desaturase system compared with PAS and HYPRO. Compared with HYPRO, RI-CLA had no effect on plasma glucose, insulin, leptin, or NEFA concentrations. Results indicate that a high RI-CLA dose decreases milk fat synthesis and tends to increase milk yield immediately post partum in pasture-fed cows; however, excessive MFD (>35%) appears to be associated with a diminished milk yield response.

Authors+Show Affiliations

Dexcel Ltd., Private Bag 3221, Hamilton, New Zealand.No 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

16836800

Citation

Kay, Jane K., et al. "Effects of Dietary Conjugated Linoleic Acid On Production and Metabolic Parameters in Transition Dairy Cows Grazing Fresh Pasture." The Journal of Dairy Research, vol. 73, no. 3, 2006, pp. 367-77.
Kay JK, Roche JR, Moore CE, et al. Effects of dietary conjugated linoleic acid on production and metabolic parameters in transition dairy cows grazing fresh pasture. J Dairy Res. 2006;73(3):367-77.
Kay, J. K., Roche, J. R., Moore, C. E., & Baumgard, L. H. (2006). Effects of dietary conjugated linoleic acid on production and metabolic parameters in transition dairy cows grazing fresh pasture. The Journal of Dairy Research, 73(3), 367-77.
Kay JK, et al. Effects of Dietary Conjugated Linoleic Acid On Production and Metabolic Parameters in Transition Dairy Cows Grazing Fresh Pasture. J Dairy Res. 2006;73(3):367-77. PubMed PMID: 16836800.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of dietary conjugated linoleic acid on production and metabolic parameters in transition dairy cows grazing fresh pasture. AU - Kay,Jane K, AU - Roche,John R, AU - Moore,Chel E, AU - Baumgard,Lance H, Y1 - 2006/07/13/ PY - 2005/08/26/received PY - 2006/01/23/accepted PY - 2006/7/14/pubmed PY - 2006/9/19/medline PY - 2006/7/14/entrez SP - 367 EP - 77 JF - The Journal of dairy research JO - J Dairy Res VL - 73 IS - 3 N2 - Supplementation with a high dose (600 g/d) of rumen inert conjugated linoleic acids (RI-CLA) inhibits milk fat synthesis in total mixed ration (TMR)-fed dairy cows immediately post partum. However, effects of RI-CLA on milk fat and bioenergetic parameters during the transition period in grazing cows have not been investigated. Multiparous Holstein cows (n=39) grazing pasture were randomly assigned to one of three treatments: (1) pasture (PAS), (2) PAS+540 g/d Hyprofat (palm oil; HYPRO) and (3) PAS+600 g/d RI-CLA. HYPRO and RI-CLA supplements were isoenergetic, fed twice daily at 7.00 and 16.00 and provided 0 and 125 g CLA/d, respectively. Treatments began 27+/-10 d prepartum and continued until 36+/-1 days in milk (DIM). There was little or no overall effect of RI-CLA on content or yield of milk protein and lactose. RI-CLA supplementation decreased overall milk fat content and yield with RI-CLA-induced milk fat depression (MFD) becoming significant by day 3 when compared with PAS and by day 6 when compared with HYPRO. MFD continued to increase in severity during the first 24 d post partum after which MFD reached a plateau (approximately 40%; RI-CLA v. HYPRO). Pasture-fed cows produced less milk (19.4 kg/d) than the lipid-supplemented groups and although there were no overall differences in milk yield between RI-CLA and HYPRO (22.3 kg/d) a curvilinear relationship (R2=0.57) existed between the RI-CLA-induced milk yield response and extent of MFD. RI-CLA tended to increase milk yield (1.8 kg/d) compared with HYPRO until MFD exceeded 35% (approximately day 21), after which point the positive milk yield response was eliminated. Milk fat trans-10, cis-12 CLA content averaged 0.25 g/100 g in the RI-CLA treatment, was temporally independent, and was undetectable in PAS and HYPRO treatments. Based on the milk fat 14ratio1/14ratio0 ratio, RI-CLA decreased the overall Delta9-desaturase system compared with PAS and HYPRO. Compared with HYPRO, RI-CLA had no effect on plasma glucose, insulin, leptin, or NEFA concentrations. Results indicate that a high RI-CLA dose decreases milk fat synthesis and tends to increase milk yield immediately post partum in pasture-fed cows; however, excessive MFD (>35%) appears to be associated with a diminished milk yield response. SN - 0022-0299 UR - https://www.unboundmedicine.com/medline/citation/16836800/Effects_of_dietary_conjugated_linoleic_acid_on_production_and_metabolic_parameters_in_transition_dairy_cows_grazing_fresh_pasture_ L2 - https://www.cambridge.org/core/product/identifier/S0022029906001944/type/journal_article DB - PRIME DP - Unbound Medicine ER -