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Effect of essential oils and amylase supplementation on productive performance of lactating dairy cows.

C. S. Cortinhas



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Effect of essential oils and amylase supplementation on productive performance of lactating dairy cows.
A. Silva1, C. S. Cortinhas*2, T. S. Acedo2, M. J. F. Morenz3, F. C. F. Lopes3, M. B. Arrigoni1, M. H. Ferreira4, T. L. Jaguaribe4. 1S�o Paulo State University Botucatu, SP, Brazil, 2DSM Nutritional Products S�o Paulo, SP, Brazil, 3Embrapa Dairy Cattle Juiz de Fora, MG, Brazil, 4Federal University of Juiz de Fora Juiz de Fora, MG, Brazil.

The objective with this study was to evaluate the effects of essential oils supplementation, in combination or not with amylase, on productive performance of lactating dairy cows. Thirty-six Holstein cows were blocked by days in milk (78.0 � 9.5) and allocated according the milk production into the treatments: a) control (CTRL), no additives; b) essential oils (EO), addition of a blend of essential oils (100 mg/kg of DM; CRINA Ruminants, DSM Nutritional Products, Basel, Switzerland); and c) essential oils + amylase (EOam), combination of the essential oils (100 mg/kg of DM) and α-amylase (625 mg/kg of DM, Ronozyme RumiStar, DSM Nutritional Products, Basel, Switzerland). Basal diets were formulated to contain 291 g/kg of NDF, 166 g/kg of CP and 304.4 g/kg of starch (DM basis). Animals were adapted to diets for 14 d, and then evaluations were carried out for 60 d. Cows were milked twice daily, and the production recorded automatically by the software Delpro Manager System. Milk samples were collected thrice weekly in 2 sequential milkings, to determine the content of fat, protein, lactose and urea nitrogen in milk. Data were analyzed using the mixed procedure of SAS. Differences among treatments were analyzed through the following contrasts: C1 = control versus feed additives; C2 = EO versus EOam. There was no difference for dry matter intake (23.8 kg/day, P = 0.44). Feed additives (EO and EOam) increased milk yield (P = 0.03) in comparison to the CTRL (31.8 vs 29.1, respectively). Means values did not differ between diets containing EOam and EO (32.1 vs. 31.5 kg/day; P = 0.57). However, higher feed efficiency was obtained in diet containing EOam versus EO (1.43 vs 1.24, respectively; P = 0.02). There was no differences (P > 0.05) for the contents of milk fat (37.7 g/kg), milk protein (30.2 g/kg), lactose (45.9 g/kg) and urea nitrogen (17.2 mg/dL). Also, no response was observed for fat-corrected milk (32.3 kg/day) and energy-corrected milk (31.6 kg/day). The use of essential oils associated with amylase increases the milk yield and feed efficiency in dairy cows.

Keywords: additives, feed efficiency, milk yield.