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A note on the effect of forage type on the yield, chemical composition and clotting properties of milk

Published online by Cambridge University Press:  25 May 2016

J. B. Coulon  and
J. P. Garel
J. B. Coulon
Affiliation:
INRA, Laboratoire d'Adaptation des Herbivores aux Milieux, Theix, 63122 Saint-Genès Champanelle, France
J. P. Garel
Affiliation:
INRA, Laboratoire d'Adaptation des Herbivores aux Milieux, Theix, 63122 Saint-Genès Champanelle, France
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Extract

Twenty-five primiparous cows in mid lactation were used in a 2 × 2 Latin-square design experiment. During each 3-week period, cows were offered a diet composed either of grass silage (8.3 kg dry matter (DM) per day) or hay (10.5 kg DM per day). Each diet was supplemented with a mixture of barley, soya-bean meal and urea in proportions calculated to keep the overall rations isocaloric and isonitrogenous. Cows offered grass silage produced more milk (+1.7 kg/day, P<0.01) with less fat and protein (−1.3 g/kg and −0.8 g/kg, respectively, P < 0.01) than those offered hay. All animals gained weight, but they gained more with the hay diet than with the grass silage diet. The rheological parameters of milk were similar in both groups. Rumen juice of cows offered hay had higher concentrations of acetic acid and slightly lower concentrations of propionic and butyric acid (P < 0.01) than cows offered grass silage.

Keywords

dairy cowsgrass silagehaymilk compositionmilk yield

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Type
Research Article
Information
Animal Production , Volume 57 , Issue 3 , December 1993 , pp. 495 - 499
Copyright
Copyright © British Society of Animal Science 1993

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