Factors influencing pregnancy rate and loss after laparoscopic artificial insemination with frozen-thawed semen in Lohi sheep under sub-tropical conditions.
Reprod Domest Anim
; 59(5): e14579, 2024 May.
Article
in En
| MEDLINE
| ID: mdl-38715456
ABSTRACT
This study evaluates factors influencing pregnancy rates per artificial insemination (P/AI) and pregnancy loss in Lohi ewes undergoing laparoscopic AI with frozen-thawed semen under sub-tropical conditions. Data from three experiments comprising ewes (n = 358) of mixed parity (nulliparous; NP and parous; P), various body condition score (BCS) and assigned to long-term (LTP, 11 days) and short-term (STP, 5 days) oestrus synchronization regimen across high breeding season (HBS) and low breeding season (LBS) were analysed. Laparoscopic insemination was conducted 54 h post-sponge removal. Pregnancy diagnosis and loss were evaluated on days 35 and 90 post-insemination via ultrasonography. Results showed parity significantly influenced P/AI, with nulliparous ewes achieving higher pregnancy ratios than parous ewes (p = .001). BCS significantly influenced P/AI (p < .05), with a quadratic relationship observed between BCS and season (BCS*BCS*Season; p = .07). Progestin treatment did not significantly influence the ratio of pregnant ewes (p = .07). Pregnancy losses were significantly higher during LBS than HBS (p < .05), irrespective of progestin treatment. In conclusion, parity and BCS significantly influenced P/AI, with BCS demonstrating a quadratic association with season. Ewes bred during LBS experienced higher pregnancy losses than HBS, irrespective of progestin treatment.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Seasons
/
Semen Preservation
/
Insemination, Artificial
/
Cryopreservation
/
Laparoscopy
/
Pregnancy Rate
/
Estrus Synchronization
Limits:
Animals
/
Pregnancy
Language:
En
Journal:
Reprod Domest Anim
/
Reprod. domest. anim
/
Reproduction in domestic animals
Journal subject:
MEDICINA REPRODUTIVA
/
MEDICINA VETERINARIA
Year:
2024
Document type:
Article
Affiliation country:
Pakistán
Country of publication:
Alemania