Active Immunization against Gonadotrophin-releasing Hormone in Chinese Male Pigs
| Autor: | D.Z Guo, H.B. Oonk, J.A. Turkstra, F.Q. Chen, X.Y. Zeng, D. F. M. van de Wiel, R.H. Meloen, X. Zhang, W.M.M. Schaaper, X.Y. Liu |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Male
medicine.medical_specialty Swine media_common.quotation_subject Biology Weight Gain Active immunization Gonadotropin-Releasing Hormone Random Allocation chemistry.chemical_compound Endocrinology Internal medicine Testis medicine Animals Weaning Endocrine system Testosterone media_common Vaccines Age Factors Androstenone Organ Size Castration chemistry Specol Immunization Animal Science and Zoology Reproduction Orchiectomy Biotechnology medicine.drug |
| Zdroj: | Reproduction in Domestic Animals. 36:101-105 |
| ISSN: | 1439-0531 0936-6768 |
| DOI: | 10.1046/j.1439-0531.2001.00256.x |
| Popis: | We have investigated, under the normal conditions of local Chinese pig farming, castration of young male pigs by vaccination with a newly developed vaccine against gonadotrophin releasing hormone (GnRH). Because of the very early onset of puberty, long fattening period and relatively harsh circumstances in Chinese pig production, an investigation of the endocrine response of Chinese breeds to this type of vaccination was of particular interest. Fifteen crossbred boars (Yorkshire x Yanan) from three different litters were randomly assigned to three groups of five animals each. The first group was immunized at 13 weeks of age with a GnRH tandem dimer OVA-conjugate in Specol and received a booster immunization 8 weeks later. The second group was injected with Specol alone and served as untreated controls. The remaining group was surgically castrated at the time of weaning (at 6 weeks of age). Pigs were fed ad libitum from weaning onwards. All animals were slaughtered at 31 weeks of age. Immunized boars had undetectable or low serum testosterone (0.09 +/- 0.12 ng/ml), low fat androstenone (0.05 +/- 0.01 microg/g) levels and very low testes weights (19.1 +/- 4.3 g). Intact controls had much higher serum levels of testosterone (9.76 +/- 4.81 ng/ml), fat androstenone levels (2.26 +/- 0.87 microg/g) and testes weights (114.3 +/- 29.41 g) at slaughter. Both the immunized and castrated group grew significantly faster than intact boars (p < 0.01). Average daily gains in immunized, castrated and intact animals were 0.69 +/- 0.08, 0.63 +/- 0.05 and 0.42 +/- 0.07 kg (mean +/- SD), respectively. The present data demonstrate for the first time that the newly developed anti-GnRH vaccine works very well under practical Chinese pig farming conditions, and can be an attractive alternative to surgical castration. |
| Databáze: | OpenAIRE |
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