Pregnancy Diagnosis

Garth猪场饲养规范

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Anatomy

Pregnancy Diagnosis	1-115 Days	In the presence of the boar to stimulate oestrus. Twice daily
	18-24 Days	In the presence of the boar checking for regular oestrus return
	> 20 Days	Real time scanner
	25-34 days	In the presence of the boar to check for late returns
	28 day	With the D?ppler machine for uterine pulse
	35 day	With the D?ppler machine for uterine pulse
	8 weeks	By eye, looking for dropped abdomenAny questionable sow, recheck with D?ppler for uterine pulse and foetal pulse
False Positives	False uterine pulse when the sow is coming or in season. This is why you need two positives (28 and 35 days) to be confident that the sow is pregnant
	Always check that the D?ppler machine is well serviced and has a well charged battery
	Regularly re-listen to the teaching tape
	Use plenty of gel between the head and the sow's body wall
Interpretation	A sow which records one negative must be rechecked the following day
	A sow with two negatives must go back to the boar and be rechecked
	A sow wrongly believed to be in pig post 35 days costs you around ?3 a day
Results Interpretation
	28 days	35 days	Significance
Results	+ve	+ve	Pregnant
Results	-ve	+ve	Coming into second oestrus return
Results	+ve	-ve	Embryonic death possibly
Results	-ve	-ve	Not pregnant

摘自Garth猪场饲养规范*
由John Carr和Garth兽医咨询公司编写
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*本书由 5M有限企业出版