Food Animal Metabolic: Hypocalcemia "Milk Fever" Flashcards
What DZ along with hepatic lipidosis is known as a metabolic DZ of transition cows?
Hypocalcemia
What is hypocalcemia?
LOW Ca2+ (N= 8-10mg/dL)
When a cow goes through parturition and is lactating it decreases the Ca2+ from -1 to +3 days postpartum.
- Challenges calcium homeostasis*
- Predisposes cows to periparturient disorders that are costly to dairy producers*
Milk fever is known as a _____________.
Gateway Dz
If i have decreased muscle fx it will :
If i have decreased feed intake it will:
If i have decreased immune fx it will:
increase mastitis, DA’s, METRITIS.
increase KETOSIS/FATTY LIVER DZ, DA’s
increase mastitis, RFM, METRITIS
What classifies a cow as hypocalcemic and when?
Decreased Ca2+ <7.5mg/dL
More common in cows with uterine prolapse. Happens within 1st 7d postpartum (especially if cows with RFM if fed a prepartum anioni diet)
What organs are affected by hypocalcemia?
Uterus (Normal fx is affected)
Abomasum
Rumen
NO APPARENT CS (NO PARESIS)
How much more likely is a cow to develop LDA from having hypocalcemia?
4.8x
For how long can a cow stay hypocalcemic post partum?
10-30% of fresh cows remain hypocalcemic up to 10 days postpartum.
At what point are the majority of cows found to have hypocalcemia?
50% of cows found to have hypocalcemia at calving <7.5mg/dL
What is the pathway for Ca2+ homeostasis?
Low Ca2+ in the blood →PTH released (this inhibits with normal to increased ca2+ levels)→activates vit D3 →increased intestinal Ca2+ absoprtion→stimulates osteoclasts→increased Ca2+ uptake from bone→enhance renal tubular Ca2+ resoprtion and decrease renal Ca2+ excretion
T/F: Ca2+ is absorbed in the small intestine with the help of Ca2+ binding protein.
True
Where to ionized protein bounds form?
the plasma
T/F: Ionized Ca2+ is metabolically active form, and is not sensitive to changes in the blood pH.
False
Very sensitive to change in blood pH
Which of the following statements is INCORRECT?
a. Low ionized calcium [] does increase PTH production and release
b. Hypocalcemia in cows commonly occur during the first 2 weeks post calving.
c. Normal total serum calcium in cows is from 8-10mg/dL
d. Ca2+ below 4mg/dL decreases the prognosis of the laterally recumbent and comatose clinical hypocalcemia cow
B. Hypocalcemia in cows commonly occurs during the first 2 weeks post calving.
Its actually 1-3 days post partum
What are some risks and predisposing factors of Hypocalcemia?
Acute Ca2+ output in colostrum
Milk production (10kg of colostrum has 23g of Ca2+ which is 9x the amt in plasma)
Having >4 lactation cows (decreases Vit D3 gut receptors, decrease osteoclast)
Blood levels of Mg, Ca, PO4
hypomagnesemia
hypophophatemia
Malfx of Ca2+ homeostatic feedback