Feeding and grazing management for dairy cattle: opportunities for improved production

P.A. Abrahamse

Research output: Thesisinternal PhD, WU

Abstract

An adequate feed intake is an important prerequisite to realize high milk production in
dairy cows, especially during grazing. The analysis of feed intake behaviour can assist in
understanding variation in daily intake and in improving its prediction. Indeed, our results
indicated that differences in feed intake behaviour were more pronounced when varying
the type of roughage than when varying the type of concentrate. Dry matter intake (DMI)
was reduced when a ration high in grass silage was fed, but milk production was only
numericaly affected. Grazing management might result in increased herbage intake and
higher intake of nutrients from herbage by improved nutritional composition of herbage.
In the first grazing experiment, herbage DMI was indeed increased when allocating cows
daily (1Da) to a new grazing plot compared to every four days (4D) allocation, but only
when pasture mass on offer and sward surface height (SSH) were high. Grazing time
increased numerically and ruminating time decreased between days in the 4D treatment,
coinciding with differences in rumen fermentation characteristics and milk composition.
Milk yield was greater in 1Da than in 4D, but milk fatty acid (FA) composition, potentially
influencing human health, showed hardly any difference. In a subsequent experiment,
herbage DMI was again greater when allocating twice daily (2D) compared to once daily
(1Db), especially when SSH was high. Grazing behaviour was more equally distributed
in 1Db than in 2D and milk yield was increased in 2D compared to 1Db at high SSH,
but as before milk FA composition hardly differed between treatment. The last grazing
experiment aimed to take advantage of the higher sugar contents of grass in the afternoon
than in the morning. It showed that grazing behaviour and herbage intake were similar
between morning (MA) and afternoon allocation (AA), but cows receiving a fresh plot in
the afternoon had a longer evening meal than cows receiving a fresh plot in the morning.
This, in combination with differences in diurnal chemical composition of the grass between
treatments probably caused higher intake of sugars in AA, resulting in a higher milk fat
content. However, milk production remained unaffected. In conclusion, the results of
this thesis indicate that short-term feed intake behaviour is related to DMI and therefore
may be a helpful tool in optimizing DMI and milk production in high-production dairy
cows. Increased pasture allocation frequency improves intake and milk yield in grazing
dairy cows, especially when offered SSH is high enough. In intensive stripgrazing systems,
reallocation of dairy cows following afternoon milking instead of morning milking has no
added value.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • Tamminga, Seerp, Promotor
  • Dijkstra, Jan, Co-promotor
Award date2 Oct 2009
Place of Publication[S.l.
Print ISBNs9789085854548
Publication statusPublished - 2009

Keywords

  • dairy farming
  • dairy cows
  • cattle feeding
  • grazing systems
  • feed intake
  • milk yield
  • milk composition
  • dairy performance
  • improvement
  • grazing management

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