Effect of equine chorionic gonadotropin on weaning-to-first service interval and litter size of female swine.
Abstract: We evaluated the effect of PMSG on the weaning-to-first service interval, total litter size and born alive litter size in swine. Four doses of PMSG (0, 500, 750 and 1,000 IU) were administered intramuscularly after weaning to sows at 3 different farms, grouped by parities (1, 2 and 3 or higher) and 2 distinct time periods. The associations among main effects and response variables were assessed by analysis of variance. Polynomial orthogonal terms were used to adjust the estimates of weaning-to-first service interval, total litter size and born alive litter size for the interaction effect of parity and PMSG treatment. The weaning-to-first service interval did not differ across periods and farms (P>0.05), although the interval was shorter (P0.05). Time period did not influence litter size (P>0.05), but there were differences in litter size across farms (P<0.05). Both litter size traits were lower for Parity 1 sows than for higher parity sows (P0.05). Litter size increased with PMSG dose in both Parities 1 and 2 (P0.05). A significant quadratic effect (P<0.05) of PMSG treatment in weaning-to-first service interval was observed for both Parity 1 and 2 sows, with the shortest intervals occurring with the 750 IU dose for Parity 1 sows. Administration of PMSG after weaning was associated with a shortened weaning-to-first service interval in Parity 1 sows and increased litter size in Parity 1 and 2 sows.
Publication Date: 2000-03-23 PubMed ID: 10729035DOI: 10.1016/s0093-691x(99)80020-xGoogle Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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The research examines how equine chorionic gonadotropin (PMSG) impacts the period between weaning and first service, and litter size in female pigs. It reveals that the introduction of PMSG post weaning shortens the period to first service in some sows and increases the size of the litter among others.
Research Methodology
- Four PMSG doses were tested (0, 500, 750, 1,000 IU) and were administered to sows after weaning at three different farms.
- The sows were grouped according to the number of parities they had – whether it was their 1st, 2nd, or 3rd (or more) litter.
- The study was conducted over two distinct time periods.
- Analysis of variance was used to examine the associations among main effects and response variables.
- Estimates of the weaning-to-first service interval, total litter size and born alive litter size were adjusted for the effect of parity and PMSG treatment using polynomial orthogonal terms.
Findings
- The period between weaning and first service didn’t vary across different periods and farms.
- A significant finding was that the interval was shorter for sows with third or further parities (4.97 days) than for first-time sows (5.29 days).
- The time period did not affect litter size, although there were differences across the farms.
- The litter sizes of the higher parity sows were larger than the litter sizes of the first-time sows.
- The litter sizes in sows with first and second parities increased with the PMSG dose, but not in sows with third and higher parities.
- In Parity 1 and 2 sows, PMSG had a significant quadratic effect on the weaning-to-first service interval, with the shortest intervals occurring with the 750 IU PMSG dosage for Parity 1 sows.
Conclusions
- The study concluded that administering PMSG after weaning can shorten the weaning-to-first service interval in first parity sows.
- Improved litter sizes were observed in first and second parity sows with the introduction of PMSG.
Cite This Article
APA
Sechin A, Deschamps JC, Lucia T, Aleixo JA, Bordignon V.
(2000).
Effect of equine chorionic gonadotropin on weaning-to-first service interval and litter size of female swine.
Theriogenology, 51(6), 1175-1182.
https://doi.org/10.1016/s0093-691x(99)80020-x Publication
Researcher Affiliations
- Faculdade de Veterinária, UFPEL, Pelotas-RS, Brazil.
MeSH Terms
- Animals
- Female
- Gonadotropins, Equine / administration & dosage
- Gonadotropins, Equine / pharmacology
- Litter Size / drug effects
- Parity
- Swine / physiology
- Time Factors
- Weaning
Citations
This article has been cited 2 times.- Belstra BA, Willenburg KL, Gómez-López DH, Knox RV, Stewart KR. Effects of the number of sperm and site of uterine semen deposition on conception rate and the number of embryos in weaned sows receiving a single fixed-time insemination.. J Anim Sci 2020 Sep 1;98(9).
- Ito T, Sendai Y, Yamazaki S, Seki-Soma M, Hirose K, Watanabe M, Fukawa K, Nakauchi H. Generation of recombination activating gene-1-deficient neonatal piglets: a model of T and B cell deficient severe combined immune deficiency.. PLoS One 2014;9(12):e113833.
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