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Productive performance of dairy cows feed with soybean silage and oat silage.

F. Rennó



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Productive performance of dairy cows feed with soybean silage and oat silage.
T. Silva, L. Ghizzi, G. Silva, A. Nunes, M. Dias, N. Grigoletto, L. Gheller, J. Marques, T. Del Valle, L. Sakamoto, L. Fernandes, F. Rennó*. University of São Paulo Pirassununga, SP, Brazil.

Use of corn silage for dairy cows is very common, but alternative silages, such as oat and whole soybean can contribute as protein and energy sources to these animals. The objective of the present study was to evaluate the partial replacement of corn silage supplied to dairy cows by soybean silage or black oat silage and its effects on intake and apparent total digestibility of dry matter and nutrients, milk yield and composition, feed behavior and sorting index. Twenty-four lactating Holstein cows were used, distributed in a 3 × 3 Latin square experimental design, receiving the following treatments: 1) corn silage (CS), using corn silage as exclusive forage; 2) soybean silage (SS), using 16% substitution of corn silage for whole soybean silage; and 3) Oat silage (OS), with 16% substitution of corn silage by black oat silage. Data were analyzed using the MIXED procedure of SAS 9.4, and differences between treatments were estimated by the Tukey test, with significancy level of 5%. Inclusion of OS and SS decreased dry matter intake, organic matter and crude protein compared with CS (P ≤ 0,009). Diet with SS decreased neutral detergent fiber (NDF) intake (P ≤ 0,004), while diet OS decreased ether extract intake (P < 0,001). Apparent total-tract digestibility of dry matter and nutrients was not influenced by the inclusion SS or OS (P > 0,069). OS decreased milk yield and milk protein yield compared with SS and CS (P < 0,001), however inclusion of SS and OS did not influence fat-corrected milk, milk fat yield, milk fat, protein and lactose contents and fat-corrected milk efficiency (P ≥ 0,062). OS increased selection of particles less than 4 mm, while SS presented an intermediate value (P = 0,049). Diets with SS and OS increased ruminating and chewing activity (P ≤ 0,029), but only SS increased ruminating and chewing activity (min/kg NDF intake) compared with control diet, while OS presented intermediate value (P ≤ 0,004). Replacing CS for OS negatively influenced dry matter intake and milk yield of dairy cows. In contrast, replacing CS with SS negatively influenced dry matter intake, however milk yield was the same as CS, can be an alternative source of forage.

Keywords: silage, productive performance, milk yield.