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Limitations of high Alpine grazing conditions for early-lactation cows: effects of energy and protein supplementation

Published online by Cambridge University Press:  18 August 2016

N. R. Berry ,
F. Sutter ,
R. M. Bruckmaier ,
J. W. Blum  and
M. Kreuzer
N. R. Berry
Affiliation:
Institute of Animal Sciences, Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zürich, Switzerland
F. Sutter
Affiliation:
Institute of Animal Sciences, Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zürich, Switzerland
R. M. Bruckmaier*
Affiliation:
Division of Nutritional Pathology, Faculty of Veterinary Medicine, University of Berne, CH-3012 Berne, Switzerland
J. W. Blum
Affiliation:
Division of Nutritional Pathology, Faculty of Veterinary Medicine, University of Berne, CH-3012 Berne, Switzerland
M. Kreuzer*
Affiliation:
Institute of Animal Sciences, Federal Institute of Technology (ETH), ETH Centre/LFW, CH-8092 Zürich, Switzerland
*
†Present address: Institute of Physiology, Technical University of Munich, D-85354 Freising, Germany.
‡Corresponding author. E-mail:[email protected]
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Abstract

In each of 2 years (years A and B), the effects of three nutritional regimes were examined using 12 cows kept at pasture for 77 days at 2000 m above sea level. Two supplement formulations (1 and 2) were designed, both equally high in readily fermentable energy (14·6 MJ metabolizable energy (ME) per kg dry matter (DM)) but differing in crude protein content (53 and 193 g/kg DM). The treatments imposed were either pasture grass alone (control groups; both seasons) or grass and supplements provided at three levels relative to energy (E) and protein (P) maintenance requirements estimated for lowland conditions. These levels were (i) 1·0 E: 0·8 P provided by 4·6 kg of supplement 1 per day in both years; (ii) 0·5 E: 0·4 P provided by 2·2 kg of supplement 1 per day in year A; (iii) 1·0 E: 2·5 P provided by 4·4 kg of supplement 2 per day in year B. Intensive measurement periods, including food intake estimation by the double alkane technique, were carried out in weeks 3, 7 and 11 on Alpine pasture. Performance data, plasma levels of indicative blood traits and body condition were additionally monitored in the cows at a lowland site for 2 weeks prior to transport. Supplementing with a high energy/low protein concentrate gave no clear benefit in milk yield, which declined proportionately by 0·33 in the 11 weeks under Alpine conditions. Provision of additional supplementary protein (supplement 2) resulted in a proportionate decline in milk yield of only 0·20 over the 11-week period. Cows exhibited high substitution ratios of 1·4 to 2·6 kg herbage DM per kg concentrate DM and cows on all treatments were estimated to consume similar amounts of ME. A combination of reduced fibre intake and lower fibre digestibility with supplementation significantly reduced milk fat contents to low levels. Energy supplementation significantly reduced plasma β-hydroxybutyrate levels. However, live-weight and body tissue loss rates (based on ultrasonic scans of subcutaneous fat layer and longissimus dorsi muscle) were equally great with and without energy supplementation but less severe with extra protein (supplement 2). Adaptation to the high Alpine conditions was achieved in all treatments as indicated by increased blood haemoglobin, accompanied by a lower plasma level of insulin-like growth factor-I. Plasma thyroid hormone levels suggested that adaptation to energy deficiency and possibly to cold was more effective with supplementary energy. Other energy-dependent blood metabolites and insulin responded similarly in all treatments to high altitude grazing. Estimated maintenance energy requirement for Alpine conditions was 0·72 times greater than lowland maintenance requirement.

Keywords

dairy cowsenergy intakehigh altitudemetabolic studiesprotein intake.
Type
Ruminant nutrition, behaviour and production
Information
Animal Science , Volume 73 , Issue 1 , August 2001 , pp. 149 - 162
Copyright
Copyright © British Society of Animal Science 2001

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