Conception risk of beef cattle after fixed-time artificial insemination using either SexedUltra ™ 4M sex-sorted semen or conventional semen

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 in ternal 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).

Source: Theriogenology - May 10, 2018 Category: Genetics & Stem Cells Authors: B.R. Crites, R. Vishwanath, A.M. Arnett, P.J. Bridges, W.R. Burris, K.R. McLeod, L.H. Anderson Source Type: research