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Use this tool to find out why your farrowing rate is less than ideal. Click on the flowchart or on the buttons found within the text to navigate through the different parts of the tool.
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Causes of irregular returns to estrus

There are several factors that can cause an abnormally long estrous cycle.

Irregular returns to estrus occur from 25 to 37 days post-service. A sow has an irregular return (abnormally long estrous cycle) when all the embryos have been lost (< 35 days of gestation) and are reabsorbed, or when only 5 or fewer embryos remain at 10 days of gestation.

Under normal conditions, these should account for a very small percentage of the matings < 3%.

Irregular returns are generally considered to be a problem when they account for more than 30% of the total returns, but it should be noted that when the total returns are very low, irregular returns will account for a higher percentage of the total, and this is considered normal, as the problem sows are those that return (we are not up against a problem).

Among the possible causes we must distinguish two major types:

Infectious causes

Non-infectious causes

Use the buttons above or the flowchart to continue troubleshooting the returns to estrus, or to access other parts of the tool.

Types of gestation losses that can lower the farrowing rate, detailing the different types of returns to estrus based on they occur.
Types of gestation losses that can lower the farrowing rate, detailing the different types of returns to estrus based on they occur.

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