胎衣不下的主要原因

wuling005

營養代謝是主要原因

zqf823

主要是體能、營養

花花好

從疾病是將樓上的說的還行.我補充以下.產前的21天很關鍵,飼料要不然做低鈣,要不然添加陰離子.不允許給牛吃苜蓿,鹽和小蘇打減半.長期使用添加尿素的飼料也有這個癥狀,長期使用維生素添加不足的飼料還會有這個癥狀.不同意我的觀點的可以聊聊.沒養過牛的免談.

jt飼料

回復 13# 花花好


我聽老師說過

niewanwan

學習了！！！！

soslxlsos

一般都是收縮無力比較多

花花好

就是陰離子鹽.

pameya

可以適當喂點鮮的禾草，補充些VC

382948097

你在圍產前期用一下陰離子鹽看看，我這使用陰離子鹽前胎衣不下約6%，使用后降到了2%.

htz

Retained Fetal Membranes
Etiology
RFM or retained placenta is a very common condition in
dairy cattle. Fetal membranes should be expelled in less
than 8 hours following normal parturition; therefore
retention for longer than 8 to 12 hours is considered
abnormal. Abortion, either infectious or sporadic, occurring
during the last half, of pregnancy frequently results
in RFM. Hydrops, uterine torsion, twinning, and dystocia
in general result in increased incidence of RFM when
compared with normal parturitions. Heat stress and periparturient
hypocalcemia also predispose to the condition.
Cows induced to calve by pharmacologic means
such as exogenous corticosteroid administration should
be anticipated to have RFM. Nutritional causes such
as overconditioning of dry cows and carotene and selenium
defi ciencies also have been incriminated. Low
le vels of vitamin A as occur in hyperkeratosis and polybrominated
biphenyls toxicity are associated with RFM,
metritis, and abortion. In selenium-defi cient areas, cattle
that have low selenium values may have an increased
incidence of RFM, metritis, and cystic ovaries. Vitamin E,
which has been shown to enhance neutrophil function,
also may be involved. Cattle fed stored feeds from areas
that are selenium defi cient should be monitored for selenium
status and supplemented routinely. Selenium
and vitamin E could be related to RFM either as a result
of pure defi ciency or altered neutrophil function.
Cattle that have RFM following parturition may be at
greater risk of the condition in subsequent years. Perhaps
more importantly, epidemiologic studies show that cows
with RFM have a higher incidence of metabolic diseases,
mastitis, metritis, and subsequent abortion. Therefore
despite the fact that many cows with RFM remain asymptomatic
as regards immediate uterine health, associated
diseases are a defi nite risk. Decreased resistance to uterine
and other infections in cattle with RFM is partially explained
by proven neutrophil dysfunction associated
with the condition in periparturient cows. In addition to
reduced neutrophil function, cattle with acute metritis
associated with RFM could have a depletion of neutrophils
in the peripheral blood as a result of acute recruitment
of neutrophils to the infected uterus as evidenced
by the degenerative left shift in the leukogram observed
in some septic metritis patients. Although septic metritis
or chronic endometritis does not occur in most cattle
with RFM, the urge to treat RFM is based primarily on the
inability to predict which cows will develop clinically
signifi cant sequelae.
Recent evidence strengthens the hypothesis that RFM is
mediated by impaired neutrophil function beginning in
the late dry period. Reduced neutrophil migration toward
tissue extracts of placentomes can be detected as long
as 2 weeks before calving in cows that go on to develop
RFM. Other neutrophil functions, such as oxidative burst