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Comparison of heat-treated rapeseed expeller and solvent-extracted soya-bean meal as protein supplements for dairy cows given grass silage-based diets

Published online by Cambridge University Press:  18 August 2016

K.J. Shingfield ,
A. Vanhatalo  and
P. Huhtanen
K.J. Shingfield
Affiliation:
Animal Production Research, MTT Agrifood Research Finland, FIN 31600 Jokioinen, Finland
A. Vanhatalo
Affiliation:
Animal Production Research, MTT Agrifood Research Finland, FIN 31600 Jokioinen, Finland
P. Huhtanen
Affiliation:
Animal Production Research, MTT Agrifood Research Finland, FIN 31600 Jokioinen, Finland
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Abstract

Sixteen early to mid lactation Finnish Ayrshire dairy cows were used in a cyclic change-over experiment with four 21-day experimental periods and a 4 5 2 factorial arrangement of treatments to evaluate the effects of heat-treated rapeseed expeller and solvent-extracted soya-bean meal protein supplements on animal performance. Dietary treatments consisted of grass silage offered ad libitum supplemented with a fixed amount of a cereal based concentrate (10 kg/day on a fresh weight basis) containing 120, 150, 180 or 210 g crude protein (CP) per kg dry matter (DM). Concentrate CP content was manipulated by replacement of basal ingredients (g/kg) with either rapeseed expeller (R; 120, 240 and 360) or soya-bean meal (S; 80, 160 and 240). Increases in concentrate CP stimulated linear increases (P < 0·05) in silage intake (mean 22·5 and 23·8 g DM per g/kg increase in dietary CP content, for R and S, respectively) and milk production. Concentrate inclusion of rapeseed expeller elicited higher (P < 0·01) milk yield and milk protein output responses (mean 108 and 3·71 g/day per g/kg DM increase in dietary CP content) than soya-bean meal (corresponding values 62 and 2·57). Improvements in the apparent utilization of dietary nitrogen for milk protein synthesis (mean 0·282 and 0·274, for R and S, respectively) were associated with higher (P < 0·05) plasma concentrations of histidine, branched-chain, essential and total amino acids (35, 482, 902 and 2240 and 26, 410, 800 and 2119 µmol/l, respectively) and lower (P < 0·01) concentrations of urea (corresponding values 4·11 and 4·52 mmol/l). Heat-treated rapeseed expeller proved to be a more effective protein supplement than solvent-extracted soya-bean meal for cows offered grass silage-based diets.

Keywords

dairy cowsgrass silagenitrogen metabolismrapeseed expellersoya-bean meal
Type
Ruminant nutrition, behaviour and production
Information
Animal Science , Volume 77 , Issue 2 , October 2003 , pp. 305 - 317
Copyright
Copyright © British Society of Animal Science 2003

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