Evaluating conventional and sexed semen in a commercial beef heifer development program

Funston, R. N.; Meyer, T. L.

doi:10.15232/s1080-7446(15)30405-8

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…Because of reduced fertility outcomes, sex‐sorted semen is preferentially recommended following oestrus detection in heifers (Guner et al., 2020; Healy et al., 2013). However, some studies indicated similar pregnancy per AI with TAI and oestrus detection (Macmillan et al., 2017; Masello et al., 2019), while the others reported the prominent increment with oestrus detection in the use of sex‐sorted semen (Funston & Meyer, 2012; Mallory et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Because of reduced fertility outcomes, sex-sorted semen is preferentially recommended following oestrus detection in heifers (Guner et al, 2020;Healy et al, 2013). However, some studies indicated similar pregnancy per AI with TAI and oestrus detection (Macmillan et al, 2017;Masello et al, 2019), while the others reported the prominent increment with oestrus detection in the use of sex-sorted semen (Funston & Meyer, 2012;Mallory et al, 2013). Thus, it was hypothesized that using the 5-day Cosynch+ Progesterone for the first insemination with sex-sorted semen would achieve similar pregnancy per AI compared to inseminated after oestrus detection.…”

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confidence: 99%

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Comparison of pregnancy per AI of heifers inseminated with sex‐sorted or conventional semen after oestrus detection or timed artificial insemination

Güner

Selcuk²,

Guclu³

et al. 2021

Reprod Domestic Animals

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The objective of the study was to compare the fertility after using sex‐sorted or conventional semen either with oestrus detection (EST) or timed artificial insemination (TAI) in Holstein heifers. Holstein heifers were randomly assigned to one of the following treatments in a 2 × 2 factorial design. Heifers in the EST group were inseminated with sex‐sorted (n = 114) or conventional semen (n = 100) after spontaneous or induced oestrus. Heifers in the TAI, subjected to the 5‐day Cosynch+Progesterone protocol (GnRH+P4 insertion‐5d‐PGF2α+P4 removal‐1d‐PGF2α‐2d‐GnRH+TAI), were inseminated with sex‐sorted (n = 113) or conventional semen (n = 88). Statistical analyses were performed using PROC GLIMMIX procedure of SAS 9.4 (SAS Institute Inc., Cary, NC). Overall P/AI was 60.7% for EST and 54.2% for TAI regardless of types of semen and 68.1% for conventional and 48.9% for sex‐sorted semen regardless of insemination strategies. Fertility of heifers inseminated with either sex‐sorted (53.5%; 44.2%) or conventional (69.0%; 67.0%) semen did not differ between EST and TAI respectively. Besides, the interaction between the semen type and the insemination strategy was not significant for P/AI. The embryonic loss was significantly greater with sex‐sorted semen (17.1%) compared to conventional semen (1.6%). There was no sire effect with sex‐sorted semen on P/AI (52.6% vs. 46.2%) and embryonic loss (16.4% vs. 18.0%). As expected, sex‐sorted semen resulted in more female calves (89.8% vs. 51.6%) than conventional semen. Thus, sex‐sorted semen can be used with 5‐day Cosynch+Progesterone protocol to eliminate the inadequate oestrus detection and to increase female calves born in dairy heifers.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Comparison of pregnancy per AI of heifers inseminated with sex‐sorted or conventional semen after oestrus detection or timed artificial insemination

Güner

Selcuk²,

Guclu³

et al. 2021

Reprod Domestic Animals

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

et al. 2018

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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.

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Semen sexing and its impact on fertility and genetic gain in cattle

Kumar,

Magotra,

Kumar

et al. 2024

Zygote

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Summary Semen sexing is among one of the most remarkable inventions of the past few decades in the field of reproductive biotechnology. The urge to produce offspring of a desired sex has remained since traditional times. Researchers have tried many methods for accurate semen sexing, but only the flow cytometry method has proved to be effective for commercial utilization. However, there were always concerns about the effects of sexed semen, especially on fertility and the rate of genetic gain. Some concerns were genuine because of factors such as low semen dosage in sexed semen straws and damage to sperm during the sorting process. Various researchers have conducted numerous studies to find out the effect of sexed semen on fertility and, in this article, we reflect on their findings. Initially, there were comparatively much lower conception rates (∼70% of conventional semen) but, with refinement in technology, this gap is bridging and the use of sexed semen will increase over time. Concerning genetic gain with use of sexed semen, a positive effect on rate of genetic progress with the use of sexed semen has been observed based on various simulation studies, although there has been a mild increase in inbreeding.

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Evaluating conventional and sexed semen in a commercial beef heifer development program

Cited by 5 publications

References 13 publications

Comparison of pregnancy per AI of heifers inseminated with sex‐sorted or conventional semen after oestrus detection or timed artificial insemination

Comparison of pregnancy per AI of heifers inseminated with sex‐sorted or conventional semen after oestrus detection or timed artificial insemination

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

Semen sexing and its impact on fertility and genetic gain in cattle

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