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Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Print version ISSN 0102-0935

Abstract

COSTA, F.M.J. et al. High moisture silage of hard or soft corn grain in citrus pulp diets for lactating cows. Arq. Bras. Med. Vet. Zootec. [online]. 2014, vol.66, n.1, pp.203-210. ISSN 0102-0935.  http://dx.doi.org/10.1590/S0102-09352014000100028.

Lactating cow performance on diets containing citrus pulp and two levels of high moisture corn silage was evaluated. Treatments were: hard texture corn or soft texture corn ensiled at the black layer, with a 9% or 18% factorial corn in the diet. Dietary citrus pulp content was 16.2% or 25.6%, for high and low corn, respectively. Twelve cows received the treatments in 4x4 Latin Squares. Daily milk yield was 27.9kg for hard corn and 28.8 for soft (P=0.19). High corn decreased milk fat content from 3.38 to 3.26% (P=0.04), and increased protein content from 2.99 to 3.03% (P=0.05) and feed efficiency from 1.50 to 1.57kg of milk/kg of intake (P=0.03). The increase of corn content generated a greater decrease in ruminal pH in the soft corn diet than in the hard corn diet (P=0.05 for the interaction of texture versus corn content). Soft corn increased the daily intake of digestible organic matter from 11.7 to 12.3kg (P=0.05). Digestive parameters suggest that ensilaging did not totally eliminate the endosperm texture effect on corn digestibility.

Keywords : cow; corn endosperm; corn vitreousness; dent corn; flint corn; floury corn.

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