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Effects of a cashew nut shell extract on production and rumen dynamics in transition dairy cows.

B. M. Goetz

Events

06-23-2020

Abstract:

186
Effects of a cashew nut shell extract on production and rumen dynamics in transition dairy cows.
B. M. Goetz*1, E. A. Horst1, E. J. Mayorga1, M. A. Abeyta1, S. Rodriguez-Jimenez1, S. Carta1, C. Hikita3, T. Watanabe3, J. M. Lourenco2, M. N. Carmichael2, T. R. Callaway2, L. H. Baumgard1. 1Iowa State University Ames, IA, 2University of Georgia Athens, GA, 3Idemitsu Kosan Co. Ltd Tokyo, Japan.

Objectives were to evaluate the effects of cashew nut shell extract (CNSE, anacardic acid 59% and cardol 18%) on production and rumen dynamics in periparturient Holstein cows. The formulated CNSE final granule contained 50% CNSE. Fifty-one multiparous cows were stratified by previous 305 ME and parity and assigned to 1 of 2 treatments 21 d before expected calving: 1) CON (control diet; n = 17) or 2) CNSE-5.0 (control diet and 5.0 g/d CNSE granule; n = 34). Following parturition, 17 cows from the CNSE-5.0 treatment were reallocated into a third treatment group: CNSE-2.5 (control diet and 2.5 g/d CNSE granule; n = 17) resulting in 3 total treatments postpartum: 1) CON, 2) CNSE-2.5 and 3) CNSE-5.0. Treatments were mixed with ground corn and top-dressed on the base TMR. Effects of treatment, time, and treatment � time were assessed using PROC MIXED. Prepartum DMI was unaffected by treatment, however postpartum it increased linearly with increasing CNSE (19.80, 21.28, and 21.40 kg/d for CON, CNSE-2.5 and 5.0 respectively; P = 0.01). Milk yield from cows fed CNSE vs CON tended to be increased (41.33 vs. 38.88 kg/d, P = 0.06). CNSE supplementation tended to increase milk protein yield relative to CON (1.42 vs. 1.32 kg, P = 0.08). There were no treatment differences detected for ECM, feed efficiency, BW, BCS, energy balance, milk components, MUN or SCC. Prepartum fecal pH decreased in CNSE supplemented cows relative to CON (2%, P = 0.06), but no treatment difference was detected for postpartum fecal pH. Rumen pH prepartum was unaltered by treatment. Relative to CON, postpartum rumen pH was increased in CNSE-2.5 and CNSE-5.0 (4.4% and 2.3%, respectively; P < 0.01). Dietary CNSE supplementation tended to decrease rumen ammonia nitrogen postpartum relative to CON (34%; P = 0.10). Little to no treatment differences were observed in the rumen volatile fatty acid profile prepartum or postpartum. In summary, CNSE supplementation increased postpartum DMI, milk and protein yield, and rumen pH with no changes detected in BW, ECM, or feed efficiency.

Keywords: periparturient, anacardic acid, rumen fermentation.

Biography: Brady is a Master's student under the direction of Dr. Lance Baumgard.