Adsa Logo White Adsa Title White

Effects of the addition of organic acids on TMR and feeding frequency on productive performance of dairy cows.

F. Rennó

Events

06-24-2020

Join F. Rennó on this page for a live text chat!
6:00 PM - 8:00 PM GMT

W93
Effects of the addition of organic acids on TMR and feeding frequency on productive performance of dairy cows.
M. Dias1, G. Silva1, L. Ghizzi1, N. Grigoletto1, T. Silva1, A. Nunes1, R. Chesini1, P. Vittorazi Junior1, J. Pettigrew2, A. Koontz3, L. Costa e Silva3, F. Rennó*1. 1University of São Paulo Pirassununga, SP, Brazil, 2James Pettigrew Consulting Nicholasville, KY, 3Alltech Inc Nicholasville, KY.

The aim of this study was to determine the effects of organic acids (OA; Mold-Zap, Alltech Inc., Nicholasville, KY) on total mixed ration (TMR) temperature and the frequency of TMR supply on intake and total apparent nutrient digestibility, milk yield and composition, sorting index and feeding behavior of dairy cows. Twenty-four Holstein cows were used in a 4 × 4 Latin square experimental design and randomly assigned to the following treatments: Control-1, basal diet, offered once a day, in the morning; OA-1, basal diet associated with OA (500 mL/1000 kg natural matter), offered once a day, in the morning; Control-2, basal diet, offered twice a day, in the morning and early afternoon; and OA-2, basal diet associated with OA (500 mL/1000 kg natural matter), offered twice a day, in the morning and early afternoon. TMR was placed in artificial troughs simulating the feeding where OA were added and temperature was recorded every 30 min for 24 h. Each experimental period lasted 21 d, being 14 d for acclimation and 7 d for data collection. Individual dry matter intake and milk yield were recorded daily and milk samples were collected for 3 consecutive days, during the morning and afternoon milking. Feed behavior was evaluated for 2 consecutive days every 5 min. Feedstuffs, orts, and feces were analyzed for the contents of DM, crude protein, ether extract, ash, NDF, and starch. Indigestible NDF was used as internal marker to estimate daily fecal DM excretion. Data were analyzed using the MIXED procedure of SAS (2001). There was an increase in milk and protein yield and milk lactose content (P < 0.005) with the presence of OA on TMR. The use of OA resulted in a tendency to increase fat-corrected milk yield (P = 0.078). However, OA had no influence on intake, nutrient digestibility, sorting index, and milk total solids content (P > 0.005). Cows fed twice a day selected more particles smaller than 4 mm (P = 0.012). The use of OA decreased the time (min/d) remained standing (P = 0.019) and idling (P = 0.045). Therefore, the inclusion of OA on TMR of dairy cows resulted in better production performance.

Keywords: additive, performance, feed behavior.