Abstract #T289
Section: Ruminant Nutrition (posters)
Session: Ruminant Nutrition II
Format: Poster
Day/Time: Tuesday 7:30 AM–9:30 AM
Location: Exhibit Hall A
Session: Ruminant Nutrition II
Format: Poster
Day/Time: Tuesday 7:30 AM–9:30 AM
Location: Exhibit Hall A
# T289
Conjugated linoleic acid, but not α-linolenic acid, improved energy balance in dairy cows fed a diet with reduced n-3 fatty acid content during the late lactation and transition period.
Harald M. Hammon*1, Laura Vogel1, Martina Gnott1, Claudia Kröger-Koch1, Joachim M. Weitzel1, Arnulf Tröscher2, Alexander Starke3, 1Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf, Germany, 2BASF SE, Lampertheim, Germany, 3Clinic for Ruminants and Swine, Faculty of Veterinary Medicine University of Leipzig, Leipzig, Germany.
Key Words: cow, fatty acid supply, essential fatty acids
Conjugated linoleic acid, but not α-linolenic acid, improved energy balance in dairy cows fed a diet with reduced n-3 fatty acid content during the late lactation and transition period.
Harald M. Hammon*1, Laura Vogel1, Martina Gnott1, Claudia Kröger-Koch1, Joachim M. Weitzel1, Arnulf Tröscher2, Alexander Starke3, 1Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf, Germany, 2BASF SE, Lampertheim, Germany, 3Clinic for Ruminants and Swine, Faculty of Veterinary Medicine University of Leipzig, Leipzig, Germany.
Corn silage (CS) based diets result in low α-linolenic acid (ALA) and conjugated linoleic acid (CLA) supply in dairy cows. The present study investigated the effects of replenishing essential fatty acids (EFA), especially ALA, and CLA in dairy cows fed a CS based diet on performance and energy metabolism during the late lactation and transition period. Holstein cows (n = 40) were fitted with abomasal tubes placed through rumen cannula and were daily supplemented either with coconut oil (45.5% C12:0; 16.9% C14:0; CNTR, 76g/d), linseed (53.9% C18:3) and safflower oil (62.0% C18:2) (EFA, 78 and 4g/d), Lutalin (CLA, c9, t11 and t10, c12, 10g/d each) and EFA+CLA from wk 9 antepartum (ap) to wk 8 postpartum (pp). A CS-based TMR was fed for the last 3 mo of gestation and early lactation. Plasma concentrations of metabolites and hormones were measured in blood samples taken on d 63, 42, 35, 21, and 10 ap and weekly from d 1 until d 56 pp. Data were analyzed using the MIXED procedure of SAS with treatment and time as fixed effects. DMI tended to be lower in CLA (P < 0.1) than in EFA (wk 7) and in CNTR (wk 8). Milk yield in late lactation declined in all groups but not EFA (P < 0.01). CLA supplementation reduced milk fat (P < 0.01) in CLA and EFA+CLA. Energy balance was improved (P < 0.01) pp in both CLA treated groups. Milk citrate concentration pp was higher (P < 0.01) in CLA than in EFA and in CNTR. Glucose concentration on d 21 pp was higher (P < 0.05) in CLA than in EFA. Plasma concentration of NEFA was higher (P < 0.05) in CNTR (d 21 and 28 pp) and EFA (d 21 pp) than in CLA and EFA+CLA. Plasma insulin concentration was highest on d 1 pp in CLA (P < 0.05) and was higher during the transition period in CLA than CNTR (P < 0.05). Our data confirmed the reduced milk fat content and improved energy balance in cows treated with CLA due to milk fat depression by t10,c12 CLA. Elevated milk citrate might point at reduced NADPH synthesis for fatty acid synthesis in the mammary gland of the CLA cows and metabolic changes in blood plasma support the improved energy balance in CLA cows.
Key Words: cow, fatty acid supply, essential fatty acids
