Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons
نویسندگان
چکیده
منابع مشابه
Factors influencing estrus and ovulation in weaned sows as determined by transrectal ultrasound.
Characterization of factors influencing estrus and ovulation in sows may facilitate development of procedures for improving reproductive performance. The experiment was conducted in confinement during 1997 to 1999 using 174 Large White x Landrace sows. After weaning, sows were checked for estrus twice daily. In the 1st yr, transrectal ultrasound was performed once daily and in the 2nd yr twice ...
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In the first of 2 experiments, we evaluated the effects on anestrous sows of pretreatment with FSH to stimulate the growth of small follicles, followed by eCG to stimulate the growth of medium follicles, estrus, and ovulation. In Exp. 2, we examined the effect of sows receiving 400 IU of eCG plus 200 IU of hCG (PG 600, Intervet/Schering Plough Animal Health, Boxmeer, the Netherlands) at weaning...
متن کاملEffect of Frequency of Boar Exposure on Estrus and Ovulation in Weaned Sows as Determined by Real-Time Ultrasound
Introduction Reproductive performance in swine is most related to inseminations occurring near the time of ovulation. This is due to the time-span for normal fertilization of eggs being limited by both the egg after the occurrence of ovulation (<12 h) and the sperm after insemination (<24 h). Therefore, the number of eggs that are fertilized, the percentage of normal embryos, the resulting preg...
متن کاملOvulation Induction in Sows
This study reviewed the protocols for ovulation induction in sows by human chorionic gonadotropin (hCG) and gonadotropin releasing hormone (GnRH). In pigs, it was documented that ovulation usually occurred about 70% of the way through oestrus. However, the duration of oestrus in sows highly varies, producing difficulty in performing artificial insemination (AI) in sows at optimal time. In pract...
متن کاملOvulation triggering with GnRH agonists
Ovarian hyperstimulation syndrome (OHSS) remains a major complication of IVF. Triggering ovulation with human chorionic gonadotrophin (HCG) (as a surrogate to LH) is a major factor in the initiation of OHSS. The pathological process usually intensifies if pregnancy is achieved, as the rising endogenous HCG overstimulates the corpora lutea. Decreasing HCG trigger dose does not prevent OHSS. Gona...
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ژورنال
عنوان ژورنال: Journal of Veterinary Medical Science
سال: 2019
ISSN: 0916-7250,1347-7439
DOI: 10.1292/jvms.18-0429