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Effects of increasing biocholine levels on productive performance of dairy cows.

F. Rennó



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Effects of increasing biocholine levels on productive performance of dairy cows.
A. Nunes1, L. Ghizzi1, G. Silva1, M. Dias1, T. Silva1, N. Grigoletto1, R. Chesini1, P. Vittorazi Junior1, P. Curti1, M. Syperreck2, F. Rennó*1. 1University of São Paulo Pirassununga, SP, Brazil, 2Nutriquest Tecnofeed Animal Nutrition Ltda Campinas, SP, Brazil.

The aim of this study was to evaluate the effects of increasing biocholine levels (Biocholine powder, Techno Feeds Brasil Ltda) on dry matter intake, milk yield and composition, productive efficiency and sorting index of dairy cows. Twenty-four Holstein cows [28.6 ± 4.4 (mean ± SD) kg milk yield per day, 160 ± 67 d in milk, 636 ± 83.2 kg BW] were enrolled in a 4 × 4 Latin square experimental design with 21 d periods and sampling performed during the last 7 d. Treatments consisted of a control (basal diet with no supplementation), and diets with 7, 14 and 21 g/cow/d of biocholine. Individual dry matter intake and milk production were recorded daily. Cows were milked twice daily and milk samples were collected for 3 consecutive days. Total mixed ration and orts were sampled for 2 d to evaluate sorting index, which was calculated as effected intake corresponding to each sieve of the particle separator (Penn State Particle Separator) expressed by percentage of total predicted intake. Data were analyzed using the MIXED procedure of SAS 9.4, using linear and quadratic contrasts to evaluate dose response of biocholine inclusion and control vs. biocholine contrast. Biocholine inclusion quadratically affected (P = 0.031) milk yield, tended to have a quadratic effect (P = 0.052) on protein and lactose (P = 0.056) yield, with maximal estimated yields at 7 and 14 g/cow/d, respectively. Furthermore, there was a tendency (P = 0.082) for a quadratic effect on milk production efficiency, with the highest estimated value at 7 g/cow/d. Biocholine quadratically increased selection of particles greater than 19 mm (P = 0.010) and decreased selection of particles between 8 and 19 mm (P = 0.003). There were no effects on feed intake, fat-corrected milk, milk fat yield, and milk fat, protein and lactose content. Therefore, biocholine inclusion increases dairy cow performance.

Keywords: additive, milk yield, vitamin.