Trujillo OME, Doporto DJM

Language: English/Spanish
References: 16
Page: 325-331
PDF size: 542.14 Kb.

ABSTRACT

The objective of the present study was to evaluate different treatments for oestrus synchronization in gilts and sows. The study was divided in two experiments. In the first experiment, three different treatments were evaluated in gilts. Each experimental group included 30 animals (Group 1, normal management; Group 2, Altrenogest and Group 3, a vasectomized male). The second experiment evaluated two different treatments in sows; two groups of 30 sows each were tested and compared (Group A, normal weaning and Group B, Altrenogest). Results in the first experiment showed that the Altrenogest group produced a significant increase of synchronized gilts and oestrus presentation (P ‹ 0.05). However, no statistical differences (P › 0.05) were found when age average at presentation of fertility, born alive piglets, born dead piglets and mommies were compared. In the second experiment, normal weaning exhibited better results (P ‹ 0.05) than Altrenogest. However, no statistical differences were observed when lactation period, weaning piglets, fertility, born alive and dead piglets were compared (P › 0.05) Therefore, Altrenogest induces oestrus synchronization in gilts and consequently, a reduction in the female reproductive cycle. However, the use of exogenous products in sows or sophisticated management can be avoided when standard management in the reproductive efficiency takes place.

REFERENCES

1. Davis DL, Knight JW, Killian DB, Day BN. Control of estrus in gilts with a progestogen. J Anim Sci 1979;49:1506-1509.

2. Henderson R, Hughes PF. The effects of partial weaning, movement and boar contact on the subsequent reproductive performance of lactation sows. Anim Prod 1984;39:131-135.

3. Tesic M, Trbojeive G, Pejin Y, Tajdie N. The influence of the boar effect on oestrus induction and production performance of gilts. Proceedings of the 11th Congress of the International Pig Veterinary Society; 1990 July 1-5; Lausanne, Switzerland. Lausanne, Switzerland: International Pig Veterinary Society, 1990:446.

4. Hughes PE, Varley MA. Reproduction in the pig. London: Butterworths, 1982.

5. Rowlinson P, Bryant MJ. Lactation oestrus in the sow 3. The influence of feeding level upon the occurrence of a fertility oestrus in lactating sows. Anim Prod 1982;35:49-53.

6. Rowlinson P, Bryant MJ. Lactation oestrus in the sow 2. The influence of group-housing, boar presence and feeding level upon the occurrence of oestrus in lactating sows. Anim Prod 1982;34:283-290.

7. Tilbrook AJ, Hemsworth PH. Detection of oestrus in gilts housed adjacent or oppositive boar or exposed to exogenous boar stimuli. Appl Anim Behav Sci 1990;28:233-245.

8. Hafez ESE. Reproducción e inseminación artificial en animales. 5a ed. México (DF): Interamericana-McGraw-Hill, 1987.

9. Redmer DA, Day BN. Ovarian activity and hormonal patterns in gilts fed allyl trenbolone. J Anim Sci 1981;53:1088-1094.

10. Costa A, Varley MA. The effect of a combination of allyl-trenbolone (AT) in lactation and gonadotrophins (Gn) after weaning on the reproductive performance of sows. Proceedings of the 12th Congress of the International Pig Veterinary Society; 1992 August 17-20; The Hague, Netherlands. The Hague, Netherlands: International Pig Veterinary Society, 1992:471.

11. Itoh Y, Kondo Y, Uchiyama K, Masuda H. Oestrous synchronization in pigs by oral administration of altrenogest from prooestrous to oestrus. Pig News Infor 1993;14:303.

12. Trujillo OME, Doporto DJM, Jaramillo H, Becerra FA. Oestrus synchronization of gilts and sows applying different methods. Proceedings of the 12th Congress of the International Pig Veterinary Society; 1992 August 17-20; The Hague, Netherlands. The Hague, Netherlands: International Pig Veterinary Society, 1992:487.

13. Daniel WW. Bioestadística. Base para el análisis de las ciencias de la salud. México (DF): Limusa, 1991.

14. Tesic M, Stankovi M, Trailovic S, Dinic-Basaria L, Pejin I. The effect of artificially reproduced voice of the boar on oestrus induction and production performance in gilts. Pig News Infor 1993;14:99.

15. Pursel VG, Elliot DO, Newman CW, Staigmiller RB. Synchronization of estrus in gilts with allyl trenbolone fecundity after natural service and insemination with frozen semen. J Anim Sci 1981;52:130-133.

16. Glossop CE. The role of the vasectomised boar in enhancing fertility with AI. Proceedings of the 12th Congress of the International Pig Veterinary Society; 1992 August 17-20; The Hague, Netherlands. The Hague, Netherlands: International Pig Veterinary Society, 1992: 432.