Conception risk of beef cattle after fixed-time artificial insemination using either SexedUltra™ 4M sex-sorted semen or conventional semen
| Autor: | L. Anderson, B. R. Crites, R Vishwanath, Kyle R. McLeod, Phillip J. Bridges, W. R. Burris, A M Arnett |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Ovulation
0301 basic medicine Time Factors medicine.medical_treatment media_common.quotation_subject Semen Beef cattle Insemination 03 medical and health sciences Animal science Estrus Food Animals Pregnancy medicine Animals Sex Preselection Small Animals Insemination Artificial media_common Estrous cycle Equine business.industry Artificial insemination Sire 0402 animal and dairy science 04 agricultural and veterinary sciences medicine.disease 040201 dairy & animal science 030104 developmental biology Fertilization Cattle Female Animal Science and Zoology Estrus Detection business |
| Zdroj: | Theriogenology. 118:126-129 |
| ISSN: | 0093-691X |
| DOI: | 10.1016/j.theriogenology.2018.05.003 |
| Popis: | The objective of this study was to compare conception rates of female beef cattle inseminated at a fixed-time with either conventional (CON) or SexedUltra™ sex-sorted (SU) semen. Treatments included CON or SU with two sires represented within each treatment. Cows (n = 316) and heifers (n = 78) from six locations were randomly assigned treatment. Ovulation was synchronized in all females using the industry-standard 7-d CO-Synch + controlled internal drug release (CIDR) protocol (100 μg GnRH + CIDR [1.38 g progesterone] on d 0, 25 mg PGF2α at CIDR removal on d 7, and 100 μg GnRH on d 10, 54 h (heifers) or 60 h (cows) after CIDR removal). Estrotect™ estrous detection aids were applied at CIDR removal and patch activation was recorded at insemination. Animals were assumed estrual if greater than 50% of the patch coating was removed. The results from this study indicated no main effects of treatment (P = 0.82), sire (P = 0.64), or age (P=0.8) on AI conception rates. Additionally, there were not significant interactions between sire and treatment (P=0.19) or age and treatment (P=0.29). There was however, a significant (P=0.0005) effect of estrous expression on conception rates. Conception rate for estrual females (62.8%) was greater (p=0.0001) than non-estrual females (38.7%) at FTAI regardless of treatment. Furthermore, the conception rates were similar (P = 0.61) between conventional (61.9%) and sex-sorted semen (63.8%) when estrus was expressed prior to FTAI. Larger studies are warranted to determine appropriate timing of insemination with sex-sorted semen in FTAI protocols to maximize pregnancy potential. |
| Databáze: | OpenAIRE |
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