Abstract #T130

# T130
Effect of maternal supplementation with essential fatty acids and conjugated linoleic acid on fatty acid status in neonatal calves.
Harald M. Hammon*1, Katrin L. Uken1, Laura Vogel1, Martina Gnott1, Armin Tuchscherer1, Arnulf Tröscher2, Dirk Dannenberger1, 1Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf, Germany, 2BASF SE, Lampertheim, Germany.

Rations for dairy cows are mainly based on corn silage (CS) but contain no fresh grass resulting in low essential fatty acid (EFA), especially α-linolenic acid (ALA), and conjugated linoleic acid (CLA) supply. We investigated the fatty acid status of neonatal calves born from dams, which were supplemented with EFA and CLA and fed a CS based TMR with low fat and ALA content. All calves were delivered by dams abomasally supplemented either with coconut oil (76 g/d; CTRL; n = 9), linseed and safflower oil (78 + 4 g/d; EFA; n = 9), Lutalin® (10 g/d c9, t11 and t10, c12 CLA, resp.; CLA; n = 9) or a combination of EFA and CLA (EFA+CLA; n = 11) during the last 9 wk of gestation and the following lactation. During the experimental period, each calf was fed with colostrum from its own dam. Fatty acids (mg/100 mg total fatty acids) were measured in colostrum and in blood plasma of calves on d 1 (before colostrum intake) and d 5 of age. Data analysis was conducted by means of the MIXED procedure of SAS as repeated measurement ANOVA containing treatment, time (blood plasma), treatment × time, and sex as fixed effects and supplementation period and duration of gestation as covariates. Maternal supplementation with EFA and EFA+CLA increased the content of ALA in colostrum (P < 0.01), whereas CLA and EFA+CLA supplementation led to higher concentrations of t10, c12 CLA in colostrum (P < 0.05). In calf, plasma total fatty acid concentration and linoleic acid increased (P < 0.05) from d 1 to d 5 of age without any treatment effect. Plasma concentration of ALA increased (P < 0.05), but docosahexaenoic acid (DHA) decreased (P < 0.05) from d 1 to d 5. Concentrations of ALA, DHA, and eicosapentaenoic acid were higher (P < 0.05) in EFA and EFA+CLA than in CLA and CTRL on d 1 and 5 of age. Concentration of c9, t11CLA increased in all groups and on d 1 and 5 was higher (P < 0.05) in CLA and EFA+CLA than in EFA and CTRL. Results indicate an improved n-3 fatty acid and CLA status in neonatal calves when cows receive respective fatty acids during late gestation.

Key Words: calf, maternal fatty acid supply, essential fatty acids