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Dairy cow responses to graded levels of rapeseed and soya bean expeller supplementation on a red clover/grass silage-based diet

Published online by Cambridge University Press:  13 July 2015

M. Rinne ,
K. Kuoppala ,
S. Ahvenjärvi  and
A. Vanhatalo
M. Rinne*
Affiliation:
Natural Resources Institute Finland (Luke), Green Technology, Animale, FI-31600 Jokioinen, Finland
K. Kuoppala
Affiliation:
Natural Resources Institute Finland (Luke), Green Technology, Animale, FI-31600 Jokioinen, Finland
S. Ahvenjärvi
Affiliation:
Natural Resources Institute Finland (Luke), Green Technology, Animale, FI-31600 Jokioinen, Finland
A. Vanhatalo
Affiliation:
Department of Agricultural Sciences, University of Helsinki, PO Box 28, FI-00014, Finland
*
†E-mail: [email protected]
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Abstract

The effects of rapeseed and soya bean expeller (SBE) supplementation on digestion and milk production responses in dairy cows were investigated in an incomplete Latin square design using five cows and four 3-week periods. The experimental diets consisted of five concentrate treatments fed at a rate of 9 kg/day: a mixture of barley and oats, which was replaced with rapeseed or SBE at two levels (CP concentration (g/kg dry matter (DM)) of 130 for the control concentrate and 180 and 230 for the two protein supplemented levels). A mixture of grass and red clover silage (1:1) was fed ad libitum and it had a CP concentration of 157 g/kg DM. Supply of nutrients to the lower tract was measured using the omasal canal sampling technique, and total digestion from total faecal collection. Protein supplementation increased omasal canal amino acid (AA) flows and plasma concentrations of AA, and was also reflected as increased milk production. However, N use efficiency (NUE) decreased with increased protein supplementation. Rapeseed expeller (RSE) tended to increase silage DM intake and elicited higher milk production responses compared with SBE and also resulted in a higher NUE. The differences between the protein supplements in nitrogen metabolism were relatively small, for example, there were no differences in the efficiency of microbial protein synthesis or omasal canal flows of nitrogenous components between them, but plasma methionine concentration was lower for soya bean-fed cows at the high CP level in particular. The lower milk protein production responses to SBE than to RSE supplementation were at least partly caused by increased silage DM and by the lower methionine supply, which may further have been amplified by the use of red clover in the basal diet. Although feed intake, diet digestion, AA supply and milk production were all consistently improved by protein supplementation, there was a simultaneous decrease in NUE. In the current study, the milk protein production increased only 9% and energy-corrected milk production by 7% when high level of protein supplementation (on average 2.9 kg DM/day) was compared with the control diet without protein supplementation showing that dairy production could be sustained at a high level even without external protein supplements, at least in the short term. The economic and environmental aspects need to be carefully evaluated when decisions about protein supplementation for dairy cows are taken.

Keywords

amino acid supplycanoladairy cowprotein supplementationsoybean
Type
Research Article
Information
animal , Volume 9 , Issue 12 , December 2015 , pp. 1958 - 1969
Copyright
© The Animal Consortium 2015 

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