Trautwein, Julia: Lucerne silage for high yielding dairy cows : evaluation of the nutritional value using chemical and in vivo methods. - Bonn, 2018. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
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author = {{Julia Trautwein}},
title = {Lucerne silage for high yielding dairy cows : evaluation of the nutritional value using chemical and in vivo methods},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2018,
month = feb,

note = {Lucerne has a high yield potential and can provide ruminants with significant amounts of energy and protein as well as having excellent structural properties. This thesis focussed on the response (dry matter intake (DMI), milk yield, milk composition and chewing activity) of high yielding dairy cows on a feeding with different combinations of forages offered as total mixed rations (TMR) with an average forage to concentrate ratio of 55:45 (dry matter (DM) basis). The forage component of the control (CON) ration was a 50:50 mixture of grass and maize silages (DM basis). The forage component of the three lucerne-based diets comprised (DM basis) either lucerne and grass silage (GL, 50:50), lucerne and maize silage (ML, 50:50) or equal proportions of grass, maize and lucerne silage (GML). A seven-phase feeding trial was conducted with a herd of 60 lactating cows. The whole herd received each diet ad libitum for six weeks. Diets with lucerne silage were only compared to the control diet. All diets (TMR) were formulated to contain the same utilisable crude protein at the duodenum (uCP) but differed in the energy, starch, fibre as well as physically effective NDF (peNDF) content. A digestibility study with sheep, determined a lower digestibility of lucerne silage of organic matter (OM) and energy content compared to grass and maize silage and a lower digestibility of fibre fractions (aNDFom and ADFom) compared to grass silage. DMI ranged from 20.8 kg (CON) to 22.3 kg (ML) and was increased for cows fed diets with lucerne silage (P<0.05). The lower energy density common to all the lucerne diets was only fully compensated for by higher DMI in the case of the ML diet. Despite higher feed intake the energy corrected daily milk yield (31.7 (GML) to 33.6 kg/day (CON)) was lower if cows were fed diets with lucerne silage. All lucerne diets resulted into a lower milk protein content compared to CON. The milk fat content of cows fed diet GL (highest peNDF>1.18 and lowest starch content) was higher (4.31%) compared to CON (3.92%). Chewing activity, determined with a chewing halter, and feeding behaviour using the data from the feed bins were examined with six dairy cows. The rumination and total chewing activity as well as the eating behaviour were not affected by diets. Cows fed ML showed the highest FI and longest eating time and spent 37.3% of total chewing time on eating and 62.7% on rumination and therefore spent more time in eating and less time on rumination compared to CON (p<0.05). A similar tendency (p<0.10) was observed for cows fed GL compared with CON. In conclusion, overall effect of forage type on feeding behaviour and chewing activity was small. Lucerne has the potential to improve the protein and fibre supply from domestic farmland to dairy cows if harvested at the optimal stage of maturity. Depending on harvest condition and post-harvest treatment lucerne silage is recommended as component for dairy rations. Maize silage is able to compensate for the lower energy content of lucerne silage and is thus well suited as a further ration component.},
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