Effect of single or double insemination on fertility of sows bred at an induced estrus and ovulation
نویسنده
چکیده
Materials and methods: In Experiment One, 17 sows received equine chorionic gonadotropin (eCG; 600 IU) intramuscularly (IM) at weaning, then 5 mg pLH IM 80 hours later to induce ovulation. Time of ovulation was determined using transrectal real-time ultrasonography. In Experiment Two, 567 sows were assigned to five treatments: no hormone treatments, AI AM and PM day 5 after weaning; eCG at weaning; AI AM and PM day 5 after weaning; pLH 80 hours after weaning, AI 36 and 44 hours later; eCG at weaning, pLH 80 hours later, AI 36 and 44 hours after pLH; eCG at weaning, pLH 80 hours later, AI 36 hours after pLH.
منابع مشابه
Merck Animal Health
Lancaster R.T., Foxcroft, G.R., Boland, M.R, Edwards, S. and Gordon, I., 1985. Fertility of sows treated with exogenous estradiol and/or gonadotropins to control postweaning estrus. Anim. Reprod. Sci., 8:365-373 In the first of two experiments 28 multiparous sows were allocated to one of the following treatments two days after weaning at approximately 35 days postpartum: (1) untreated; (2) i.m....
متن کاملRelationship of weaning-to-estrus interval to timing of ovulation and fertilization in sows.
Data from two experiments were used to study the relationship between weaning-to-estrus interval (WEI, varying from 3 to 6 d) and the duration of estrus, the interval from onset of estrus to ovulation and fertilization results at 120 h after ovulation, in 201 multiparous sows. An increase in WEI resulted in a decrease in the duration of estrus (Duration of estrus (h) = [81 (exp1) or 88 (exp2)]-...
متن کاملAdministration of p.g. 600 to sows at weaning and the time of ovulation as determined by transrectal ultrasound.
This study determined whether the interval from estrus to ovulation was altered by giving P.G. 600 to sows at weaning. Mixed-parity sows received P.G. 600 i.m. (n = 72) or no treatment (n = 65) at weaning (d 0). Beginning on d 0, sows were observed for estrus twice daily. At the onset of estrus and thereafter, ultrasound was performed twice daily to determine the average size of the largest fol...
متن کاملBenefits of synchronizing ovulation with porcine luteinizing hormone (pLH) in a fixed time insemination protocol in weaned multiparous sows.
Materials and methods: Multiparous sows were randomly assigned to treatment at weaning. From weaning, twice-daily boar exposure facilitated estrus detection. Untreated control sows (n = 150; CONT) were artificially inseminated at least twice. Treated sows (n = 168; LUT) received 5 mg pLH intramuscularly concomitant with the first detection of standing heat. To coincide with the normal working d...
متن کاملEffect of number of motile, frozen-thawed boar sperm and number of fixed-time inseminations on fertility in estrous-synchronized gilts.
There are advantages for use of frozen-thawed boar sperm (FTS) as a tool for preservation and transfer of valuable genetic material, despite its practical limitations. It was hypothesized that increasing the number of motile FTS and number of fixed-time artificial inseminations (AI) would improve pregnancy rate and litter size. Semen from six boars was frozen in 0.5mL straws at 500x10(6)cells/m...
متن کامل