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Dietary phytogenics affect milk production in Holstein dairy cows.

S. Ramirez




Dietary phytogenics affect milk production in Holstein dairy cows.
S. Ramirez*1, P. Gott1, A. Tacconi2, R. Murugesan1. 1BIOMIN America Inc Overland Park, KS, 2BIOMIN Holding GmbH Getzersdorf, Lower Austria, Austria.

The anti-inflammatory properties of phytogenics may help keep the immune system homeostatic allowing for a more efficient use of nutrients and energy toward productive biological processes such as milk production. The study objective was to determine the effects of a phytogenic feed additive, Digestarom Dairy (DD; BIOMIN America, Overland Park, KS) on milk production of a commercial dairy herd. Nine pens were allotted to a control (CON, n = 4 pens) diet or a diet (n = 5 pens) containing DD at a target intake of 2 g/h/d. For 186 d, cows were milked twice per day and test day information was collected monthly. The amount of cows for each lactation group (1, 2, 3, and 4+) was 828, 470, 224, and 117, respectively for CON and 796, 732, 370, and 133, respectively for DD. For each cow within pen, daily milk production was fitted to a 305-d Wood's lactation curve model. From this model, peak milk, 305-d total milk, and persistency were estimated for each treatment and lactation group (1, 2, 3, and 4+) and these data were analyzed via GLIMMIX procedure of SAS. Test day fat and protein were used to calculate energy-corrected milk (ECM) at the estimated peak day and total milk for 305 d. For lactation 1, DD increased (P < 0.05) peak milk by 1.76 kg and increased (P < 0.05) total milk and total ECM by 522.08 and 170.59 kg, respectively compared with CON. For lactation 2, 3, and 4+, there was no statistical difference in lactation 2, 3, and 4+ between dietary treatments; however, averaged across lactation groups, DD significantly increased (P < 0.05) peak milk and ECM at peak by 2.16 and 1.22 kg, respectively compared with CON. The numerical improvement in total milk and total ECM was driven by a significant (P < 0.05) reduction in protein and numerical increase in fat when cows were fed DD compared with CON. In conclusion, DD improved milk production both at peak production and estimated 305 d total milk compared with CON, but the extent of this improvement was dependent on lactation group.

Keywords: milk production, phytogenics, lactation curve.