Rectal examination is combined with B-ultrasound for cows to diagnose delayed ovulation in dairy cows. Diagnosis of this dairy cow disease is difficult. If the previous estrus is normal, it is recommended to have two direct examinations or two B-ultrasound examinations for cows in the next estrus cycle. Cows are in peak estrus and check again after 24-36 hours. If the same follicle exists on the same ovary, and the size of the follicle remains the same, the rectal examination should be accompanied by a B-ultrasound examination of the cow. The B-ultrasound image of the cow shows the same ovary. The position and size of the follicle did not change, and the sonogram showed a hypoechoic fluid dark area. It can basically be judged as this kind of disease
The clinical symptoms of delayed milk steak eggs, cows suffering from delayed ovulation, ovaries and uterus are normal, and the appearance of estrus symptoms are the same as normal, but the duration of estrus is prolonged, and the cows can reach 3-5 days or longer. Sick cows behave differently in estrus, but they have a common feature that the resistance of vaginal mucus in cows that still have follicles 24 hours after insemination is lower than that of ovulated cows. However, if you want to diagnose this disease, you need to combine rectal examination and cattle B-ultrasound to make a comprehensive judgment, so that it will be accurate.
Hormone measurement is used to diagnose milk steak egg delay. Cows suffering from delayed ovulation have a low level of P4 in blood or milk, which is maintained at the pre-ovulation level and lasts for a long time. After mature follicles are luteinized or ovulated, they will show a normal P4 cycle. However, in order to diagnose this disease, a combination of the above methods (rectal examination, B-ultrasound for cattle, hormone determination, etc.) is required.
Diagnosis of Delayed Milk Steak Eggs in Cattle with B-ultrasound and Other Different Methods
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