milk yield

Bijeenkomst: EGF2015
Auteur: Jørgensen G.H.M., Eilertsen S.M., Hansen I. and Aanensen L.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
The aim of the experiment was to investigate the activity and behaviour of dairy cows with access to different outdoor areas. The study took place on two commercial farms with loose-housing and automatic milking systems (AMS). One farm offered 2.8 hectares of green pasture and the other offered a 0.7-hectare exercise pen. Sixty-six percent of the cows with access to green pasture went outside whenever possible. More activity was observed on ‘pasture-days’. Most observations were spent grazing (72.2%). Milk yield was, however, lower (P

Bijeenkomst: EGF2015
Auteur: Spörndly R. and Spörndly E.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
With the aim to study the effect of protein supplement, two concentrate diets, one consisting of cereal grain only, and one with protein supplements added, were combined with two grass-clover silages with different contents of crude protein (130 and 170 g kg‑1 dry matter) and fed to 37 cows of the Swedish Red breed during 20 weeks. The silages, offered ad libitum, were of first cut, and to achieve the higher protein content additional pure red clover silage was added in a mixer wagon prior to feeding. The low protein silage was 95% dominated by timothy and meadow fescue. Concentrate type did not affect silage intake. Cows fed concentrate without protein supplement had a lower milk yield but a higher milk fat content (P

Bijeenkomst: EGF2015
Auteur: Wolf P., Prochnow A. and Berg W.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
Milk yields in Germany are still increasing for economic and other reasons. Cows with higher yields need diets with higher protein and energy content. This necessitates changes in the amounts of individual feedstuffs within the diets. Accordingly, these changes result in a shift in land use from grassland to cropland. The relationship between the diets of dairy cows (including replacement) and the associated use of grassland and cropland was studied. For this purpose, the fixed amount of the annual milk production in Germany was set as a basis. The milk yield was varied from 4,000 to 12,000 kg energy corrected milk (ECM) cow‑1 year‑1, in steps of 2,000 kg ECM cow‑1 year‑1. The results show a decreasing use of utilized agricultural area (UAA), especially grassland, with increasing milk yield. The total use of UAA is similar for the higher milk yields. Thus, the lowest use of the resource land (UAA and grassland) associated with a defined amount of produced milk occurs at milk yields of 10,000 and 12,000 kg ECM cow‑1 year‑1. The use of cropland is growing with milk yields increasing over the whole investigated scope.