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Dairy Cow Fertility - Coggle Diagram
Dairy Cow Fertility
USS
The two pathologic forms of bovine cystic ovary disease, follicular cysts and luteal cysts, are etiologically and pathophysiologically related but differ clinically. Both are characterized by the presence of a fluid-filled structure >25 mm diameter, persisting for >7 days and associated with abnormal reproductive performance.
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Detachable follicular cyst v luteal cyst based on wall thickness being around 3mm but trabeculae being present
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Uterus under the influence of oestrogen. Red arrows show oedematous endometrium. Blue arrow pointing to clear fluid in the uterine lumen.
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4 phases of oestrous
Proestrus
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dominant follicle selected and grows, producing increasing amounts of oestradiol
oestrus
dominant follicle reaches max growth, matures and ovulates
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Metoestrus
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'metoestrus bleeding'
patches and streaks of blood are seen in vaginal mucus, staining tail and perineum
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Important for production
soon after calving daily milk yield increases quickly then more gradually to a peak milk yield of 40-60d in milk (DIM)
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In an all year round (AYR) calving herd --> want as many cows as poss in early lactation to maximise FCE and overall herd milk production
average days in milk is improved by 1 month, then that will lead to a 6-10% increase in daily milk yield.
