Artificial Insemination in Sheep with Fresh Diluted Semen: Comparison Between Two Different Semen Extenders and Management Protocols
| Autor: | Duccio Panzani, S. Castellani, M. Shawahina, A. Hassan, A. Madrigali, F. Di Iacovo, Cristiano Rossignoli, Francesco Camillo, Alessandra Rota |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
sheep
food.ingredient medicine.medical_treatment Population Semen Biology SF1-1100 west bank Animal science food Yolk medicine education natural mating education.field_of_study out of season General Veterinary Artificial insemination Domestic sheep reproduction artificial insemination Animal culture Semen extender Pregnancy rate Animal Science and Zoology Flock |
| Zdroj: | Tropical Animal Science Journal, Vol 44, Iss 3 (2021) |
| Popis: | Timed artificial insemination (TAI) is a very important tool for reproductive programs in small ruminants, providing synchronized inseminations and more efficient use of superior males. The objectives of this study were to investigate the viability of different breeding protocols under sub-optimal conditions and out of the breeding season, and to compare the outcome of TAI in sheep with two different semen extenders. Ewes (n=575) were subjected to estrous synchronization by intravaginal sponges containing 30 mg of medroxyprogesterone acetate and PMSG. Ewes were divided into 5 groups according to the semen extender employed and to the breeding protocol: 1) egg yolk citrate AI reinforced by ram (EYC-RR); 2) Andromed AI reinforced by ram (AND-RR), where rams joined the flocks 3 hours after AI; 3) egg yolk citrate AI without ram exposition (EYC); 4) Andromed AI without ram exposition (AND). In all these groups vaginal AIs were performed 56±2 hours from sponge removal and PMSG injection; 5) natural mating (RAM) where rams were introduced 48 hours following sponge removal and PMSG injection. Pregnancy rate, parturition rate, and prolificacy were significantly higher (p |
| Databáze: | OpenAIRE |
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