Factors affecting conception rate of hair ewes after laparoscopic insemination with chilled semen under tropical conditions
| Autor: | José C. Segura-Correa, Juan Gabriel Magaña-Monforte, Narda Yanerit Aké-Villanueva, JR Aké-López, Jesús Ricardo Aké-Villanueva |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Estrous cycle
Gynecology medicine.medical_specialty 040301 veterinary sciences Artificial insemination medicine.medical_treatment 0402 animal and dairy science Semen 04 agricultural and veterinary sciences Biology Insemination 040201 dairy & animal science Breed 0403 veterinary science Vaginal sponges medicine.anatomical_structure Animal science Food Animals Vagina medicine Animal Science and Zoology Equine chorionic gonadotropin |
| Zdroj: | Small Ruminant Research. 153:114-117 |
| ISSN: | 0921-4488 |
| Popis: | The objective was to evaluate the effect of some factors on the conception rate of hair ewes using laparoscopic intrauterine insemination with chilled semen under tropical conditions. Data on 1200 inseminations carried out in Pelibuey, Blackbelly, Katahdin and Dorper ewes from 19 farms were used. Estrous was synchronized using vaginal sponges or a controlled intravaginal drug release (CIDR) device by 12 days. At the withdrawal of the device (sponge/CIDR) 200 or 250 IU of equine chorionic gonadotropin (eCG) was applied. Insemination was carried out 54–56 h after withdrawal of the device using chilled semen with 150 million spermatozoa per dose. Ultrasound conception diagnosis was carried out 35–40 d after insemination. The effects of ewe breed, age of ewe (1–4 years), body condition score (low, middle and high), type of device (sponge and CIDR), dose of eCG (200 and 250 IU), year of insemination (2010–2012), season (hot-dry, hot-humid; fresh-humid), inseminator (5 inseminators) and simple interactions on conception rate were determined using binary logistic regression. The overall conception rate was 66.4%. There was not significant interactions of main effects. Only breed, body condition score (BCS) and year of insemination influenced (P |
| Databáze: | OpenAIRE |
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