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Differences in total mixed ration dry matter percentage affect the feed intake and the milk yield of Holstein cows.

V. S. Izquierdo

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06-22-2020

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Abstract:

M99
Differences in total mixed ration dry matter percentage affect the feed intake and the milk yield of Holstein cows.
V. S. Izquierdo*, C. Pizoni, J. P. Noschang, M. F. B. Savela, E. G. Malaguez, J. Halfen, E. Schmitt, B. S. Menezes, E. G. Xavier, A. A. Barbosa, C. C. Brauner, J. O. Feij�, V. R. Rabassa, F. A. B. Del Pino, M. N. Corr�a. N�cleo de Pesquisa, Ensino e Extens�o em Pecu�ria (NUPEEC), Departamento de Cl�nicas Veterin�ria, Universidade Federal de Pelotas Pelotas, Rio Grande do Sul, Brazil.

The high yielding cows need a balanced diet to keep the equilibrium between feed intake and productivity, any difference in diet qualities can impact directly the livestock's production, mainly on confinement systems. The aim of this study was to evaluate if the changes in the percentage of dry matter could negatively affect the feed intake and milk yield of Holstein cows. This study was performed on a commercial dairy farm in the south of Brazil, during the months of May to November of 2019. All the cows enrolled in this study were multiparous, housed in a compost barn and belonging from the highest milk production group (n = 120). For this study was used the database registered for a subset of cows during the period of 66 d totaling 617 observations of DMI from feeders that measure the intake. For the milk yield database was used the overall mean of milk production of the same group of cows during the same period. To measure the dry matter percentage, samples of TMR was collected and classified as ideal (between 45% and 60%, n = 45) and not ideal (<45% or > 60%, n = 21). The diet composition was based in water (15,87%), ground corn (1,98%), soybean meal (5,75%), soybean residue (5,16%), rice bran (3,77%), wet maize silage (3,97%), corn silage (53,56%), rice residue (1,98%) and pre-dried ryegrass (3,97%). The data were analyzed using the ANOVA one-way of the SAS program. The DMI was greater in the ideal group (P < 0.01) when compared with the not ideal group (19.77 � 6.00 Kg vs. 16.63 � 7.47 Kg of DMI). The milk yield showed a trend (P = 0.07) to be higher on the ideal group when compared with the not ideal (36.99 � 3.06 vs. 35.48 � 3.30 L/milk/day). These results suggest that cows feeding not ideal concentration of dry matter may reduce the DMI and tend to be less productive than those with ideal concentration.

Keywords: compost barn, intake measurement, dairy cows.

Biography: Vinicius de Souza Izquierdo is a master student at the Federal University of Pelotas, Brazil. He received a degree in Veterinary (2018) from the Federal University of Pelotas, Brazil. He participates in a research group since 2019, where he works with animal metabolism, mainly with dairy cows.