5 research outputs found
Supplemental chromium and revaccination effects on performance and health of newly weaned calves
Two trials were conducted to evaluate the effects of chromium (Cr) supplementation (4 mg/hd/day in a yeast form) or no supplementation, with or without revaccination with a modified live viral vaccine at 9 days postweaning o n performance, health, and ability to withstand an IBR challenge infection. In Trial 1, Cr supplementation had no effect on performance of newly weaned calves in a 28-day receiving study, but reduced the incidence of respiratory disease by 37%. Revaccinati on depressed dry matter intake and had no effect on animal health. In trial 2, blood plasma levels of cortisol and ACTH (stress hormones ) were measured at 6 and 26 days postweaning. Cortisol levels were unaffected by treatment or by time after weaning. Plasma ACTH conc e ntrations were lower at 26 vs 6 days postweaning, and were reduced at 26 days by revaccination. Despite some slight differences in rectal temperature, treatment did not appear to affect the animals\u27 ability to withstand a live IBR challenge. We concluded that supplemental Cr was beneficial in reducing the incidence of bovine respiratory disease, although mediation of stress hormones was not involved. Revaccination of newly weaned calves with a modified live viral vaccine showed no performance or health benefit
Supplemental chromium and revaccination effects on performance and health of newly weaned calves
Two trials were conducted to evaluate
the effects of chromium (Cr) supplementation
(4 mg/hd/day in a yeast form) or no
supplementation, with or without revaccination
with a modified live viral vaccine at
9 days postweaning o n performance, health,
and ability to withstand an IBR challenge
infection. In Trial 1, Cr supplementation had
no effect on performance of newly weaned
calves in a 28-day receiving study, but
reduced the incidence of respiratory disease
by 37%. Revaccinati on depressed dry matter
intake and had no effect on animal health. In
trial 2, blood plasma levels of cortisol and
ACTH (stress hormones ) were measured at 6
and 26 days postweaning. Cortisol levels
were unaffected by treatment or by time after
weaning. Plasma ACTH conc e ntrations were
lower at 26 vs 6 days postweaning, and were
reduced at 26 days by revaccination. Despite
some slight differences in rectal temperature,
treatment did not appear to affect the animals'
ability to withstand a live IBR challenge. We
concluded that supplemental Cr was
beneficial in reducing the incidence of bovine
respiratory disease, although mediation of
stress hormones was not involved.
Revaccination of newly weaned calves with a
modified live viral vaccine showed no
performance or health benefit