Resumo

RAMIREZ HERNANDEZ, Isabel Cristina  e  GIRALDO VALDERRAMA, Luis Alfonso. Evaluation of dietary supplements containing castor cake on in situ degradation, diets with Kikuyu grass and dairy production in Holstein cows. Ces. Med. Vet. Zootec. [online]. 2017, vol.12, n.2, pp.103-122. ISSN 1900-9607.  https://doi.org/10.21615/cesmvz.12.2.3.

Meat castor cake is a protein byproduct from the mechanical extraction of castor oil, which could replace imported protein sources in dairy supplements. Two experiments were carried out with the purpose of evaluating the effect of the supplementation with castor cake on the in situ degradation of DM, CP, NDF and milk yield of Holstein cows.

In experiment 1, three rumen fistulated cows were used, under an experimental design of complete random blocks. Five supplements were evaluated with five levels of inclusion of castor cake (0, 8, 16, 24 and 32%), which formed part of five diets composed of 70% of grass kikuyo, Cenchrus clandestinus and 30% of the respective supplement. The inclusion of 8 to 16% of castor cake in the supplement did not affect (P> 0.05) the degradation parameters of the fractions evaluated.

In experiment 2, a feed supplement containing 10% CaOH2-treated castor cake was evaluated for feed intake, milk yield and quality in Holstein cows in the first third of lactation, comparing it to a concentrate containing 10% soy cake. Eight cows were used, which were randomly assigned to one of two treatments, in an experimental or Change-Over Simple or 2 x 2 Cross-Over design. Supplementation with concentrate containing 10% of castor cake treated with CaOH2 did not affect DM consumption, milk production and composition.

Palavras-chave : Agroindustrial byproduct; Cenchrus clandestinus; Dairy cow; Nutritional value; Ricinus conmunis.

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