Time of Ovulation and Reproductive Performance over Three Parities After Treatment of Primiparous Sows with Pg600.
From: Setor de Suínos, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9090, CEP 90540 000 Porto Alegre, RS, Brazil.
Theriogenology
- Publish Date: Nov 2006
- ISSN: 0093-691X
- Volume: 66
- Issue: 8
- Pages: 2017-23
- Medium: Print
- Language: English
- Citation (JAMA): Vargas Anamaria J, Bernardi Mari L, Wentz Ivo, et al. Time of Ovulation and Reproductive Performance over Three Parities After Treatment of Primiparous Sows with Pg600.. Theriogenology Nov 2006;66:2017-23
Abstract
Primiparous sows from a commercial pig farm in central Brazil were utilized to investigate the effect of post-weaning gonadotrophins (given during summer) on estrus, time of ovulation and reproductive performance over three parities. One group of sows (PG600) was treated with a combination of 400 IU equine chorionic gonadotrophin (eCG)+200 IU human chorionic gonadotrophin (hCG) (PG600) 24h after weaning (n=420), whereas the control group received saline (n=408). In a subset of sows (n=150), estrus was detected and time of ovulation was determined by transcutaneous ultrasound. Treatment with PG600 increased the percentage of primiparous sows in estrus within 10 days after weaning (94.8% versus 79.7%) and reduced the first weaning-to-estrus interval (5.3 days versus 8.0 days) relative to control sows (P<0.05). Although the duration of estrus was longer (P<0.05) in sows given PG600 (65.7 h versus 61.0 h), the interval from estrus to ovulation was not different (P>0.05) between PG600 and control sows (46.6 h versus 43.3 h). Treatment with PG600 did not affect (P>0.05) rates of return-to-estrus and farrowing over three parities, but it increased the number of total piglets born (P<0.05) in the second parity (11.2 versus 10.4), thereby minimizing the magnitude of second-litter syndrome. Culling rates from the first to the fourth parity were 26.7 and 24.5% (P>0.05) for PG600 and control sows, respectively. In conclusion, PG600 given 24 h after the first weaning reduced the weaning-to-estrus interval and increased the size of the second litter.
Mesh Headings (Keywords): Animals, Breeding, Chorionic Gonadotropin, Drug Combinations, Estrus, Estrus Detection, Female, Gonadotropins, Equine, Litter Size, Ovulation, Parity, Pregnancy, Reproduction, Swine, Time Factors, Weaning
Check for Full Text / PubMed Unique Identifier (PMID): 16870243
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