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Intake, apparent digestibility, milk production and composition in dairy cows fed with wheat middlings



Intake, apparent digestibility, milk production and composition in dairy cows fed with wheat middlings



Revista Brasileira de Zootecnia 33(6. Suppl. 2): 2161-2169



The objectives of this study were to detect how many days were necessary for animals adapt to the diets by measuring intake, and to evaluate the effect of crescent levels of wheat middlings as a replacement for maize meal in the diets on the milk production and composition, the intake and apparent digestibilities of dry matter (DM), organic matter (OM), neutral detergent fibre (NDF), ether extract (EE), total carbohydrates (TC), crude protein (CP), intake of total digestible nutrient (TDN) and non fibre carbohydrate (NFC), as well as diets economical evaluation. Twelve Holstein cows were allotted to four balanced 4x4 Latin square design in accordance with the lactation period. The four experimental diets were formulated to contain 70% maize silage and 30% of concentrate. Crescent levels of wheat middlings were used in the concentrate (0, 33, 67 and 100%) as a replacement for maize meal, for the treatment 1, 2, 3 and 4, respectively. All diets were isoproteics, with approximately 15% CP. Five days was enough for adaptation of the animals to the rations. There was a linear increase in the intake of NDF, expressed as kg/day and %LW and linear decrease in the intake of NFC, however there was no change in the intake of DM, OM, CP, EE, TC and TDN. The total apparent digestibilities of DM, OM, TC and CP presented a linear decrease response, with increasing levels of wheat middlings in the diets. However, the total apparent digestibilities of EE and NDF did not change. The milk production corrected or not for 3.5% fat and milk protein, fat, milk dry matter and defatted milk contents were not influenced by the wheat middlings levels in diets.

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Accession: 004208606

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