Diurnal ingestive behavior of Nellore steers receiving increasinglevels from supplement in pasture of Brachiaria brizantha
2011
The objective of this experiment was to evaluate the diurnal ingetive
behavior Nellores steers with increasing levels of energy and protein
supplemention by raising in pasture of Brachiaria brizantha. The
on-farm trial was developed at Boa Vista Farm in conjunction with Bahia
State University, southwestern Bahia, Brazil, where forty 26-month-old
Nellore steers with the initial weight of 371.0 ± 14.9 kg were
previously accommodated to the experimental conditions for 14 days;
they were randomly allotted in the following treatments: T 00 = mineral
salt, T 03 = 0.3%, T 06 = 0.6%, and T 09 = 0.9% of energy and protein
supplementation for 84 days. The animals were visually observed at
10-minute intervals for two periods of 12 hours from 6:00 am to 6:00
pm. Time for ruminating (P<0.06) had cubic effects; time for grazing
(P<0.00001) and idling (P<0.00006) had quadratic effects while
time for feeding had increasing linear effects (P<0.00001). The
total of feed dry matter intake either in kg/animal/day or percentage
(%) of the live body weight were not affected by increasing the levels
of energy and protein (P>0.15). However, the total of dry forage
intake and the fiber contents evaluated in neutral and acid detergent
were linearly reduced (P<0.0002). Furthermore, the total time of
chewing the number of bolus, and the ruminating time per bolus had
cubic effects (P<0.0001); the chewing number per bolus was linearly
reduced (P<0.000001); the number of grazing events (P<0.15) and
the time of feeding was linearly increased (P<0.000001) although
each grazing event had its average time linearly reduced
(P<0.000001); the number of ruminating (P<0.02), idling events
(P<0.000001), and time for each ruminating event (P<0.0002) had
quadratic effects. Finally, the number of events at trough had cubic
effects (P<0.000001) but the time of each idling event was not
modified by the treatments (P>0.15). Therefore, it is necessary to
pay special attention to the diet composition for raising beef-cattle
and to the amount of feed in conjunction with both composition and
ratio of pasture to concentrate because some diurnal behavior which
have affected on the ingesting performan-ce of Nellore steers.
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