Effect of two routes of administration of human chorionic gonadotropin upon oestrus induction and reproductive outcomes in adult acyclic mix-breed goats
| Autor: | A.S. Alvarado-Espino, K. I. Tapia-Robles, Francisco G. Véliz-Deras, Miguel Mellado, Juan Ramón Luna-Orozco, C. Leyva, Cesar A. Meza-Herrera, Rafael Rodríguez-Martínez |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
endocrine system
medicine.medical_specialty medicine.medical_treatment media_common.quotation_subject Physiology Luteal phase Human chorionic gonadotropin 03 medical and health sciences 0302 clinical medicine Internal medicine Follicular phase medicine Saline Ovulation Testosterone media_common Estrous cycle oestrus and ovulation induction lcsh:Veterinary medicine 030219 obstetrics & reproductive medicine General Veterinary pregnancy rates business.industry Goats 0402 animal and dairy science 04 agricultural and veterinary sciences 040201 dairy & animal science Breed anoestrus season Endocrinology hCG treatment lcsh:SF600-1100 Animal Science and Zoology business |
| Zdroj: | Journal of Applied Animal Research, Vol 46, Iss 1, Pp 190-194 (2018) |
| ISSN: | 0974-1844 0971-2119 |
| DOI: | 10.1080/09712119.2017.1284075 |
| Popis: | The effectiveness of two routes of administration of human chorionic gonadotropin (hCG) upon oestrus induction in anoestrus mix-breed goats was evaluated. Goats [n = 27, 39.6 ± 2.18 kg live weight and body condition score of 1.71 ± 0.02 units (scale 1–5)] were primed with 20 mg P4-intravulvosubmucosal (IVSM) 24 h prior to hCG administration. Thereafter, goats were randomly allocated to three groups to receive 100 IU hCG (0.1 mL) intramuscular (IM, n = 9), or IVSM (n = 9), and saline (0.5 mL) IM injection (CONT, n = 9). Ovarian follicular or luteal tissue was monitored by transrectal ultrasonographic scanning 15 days pre- and 5 days post-treatment. Besides, goats were daily monitored (0800 and 1800 h) × 15 days to detect oestrus signs with the use of aproned sexually active bucks, treated with testosterone; 12 h after the onset of oestrus, goats were mated. While the CONT-goats never depicted neither oestrus nor ovulation (P .05). Oestrus response (83.5%), pregnancy (60.6%) and litter size (1.55 ± 0.2) did not differ (P > .05) between the IM and IVSM groups. A single application of 100 IU hCG, irrespective of administration route, induced sexual activity in acyclic goats, generating key out-of-season reproductive outcomes. |
| Databáze: | OpenAIRE |
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