Factors associated with fertility of nulliparous dairy heifers following a 10‐day fixed‐time artificial insemination program with sex‐sorted and conventional semen

Noonan, EJ; Kelly, JC; Beggs, DS

doi:10.1111/avj.12430

Cited by 12 publications

(16 citation statements)

References 16 publications

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“…The average empirical conception rate for sex sorted semen was 48.3% (ranging from 41 to 50.4 over various herds). The conception rate of sexed as a percentage of conventional semen ranged from 71.8 to 78.5% in various herds, which were in accordance with the results reported in the literature (Andersson et al 2006;Cerchiaro et al 2007;Chebel et al 2010;Norman et al 2010;Healy et al 2013;Karakaya et al 2014;Noonan et al 2016).…”

Section: Conception Rate and The Number Of Services Per Conceptionsupporting

confidence: 90%

Reproductive performance of sexed versus conventional semen in Holstein heifers in various semiarid regions of Iran

Joezy-Shekalgorabi

Maghsoudi

Mansourian³

2017

Italian Journal of Animal Science

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For comparing reproductive performance of sexed versus conventional semen a total of 3573 heifer insemination records collected from five herds in four provinces of Iran were investigated. The studied provinces were classified into three regions: hot semiarid (Tehran and Alborz provinces), temperate semiarid (Khorasan Razavi province) and cold semiarid (Zanjan province). Various parameters including the conception rate, number of services per conception, calf sex ratio, calf birth weight, gestation length, calving ease score, abortion and stillbirth as well as twining rate were investigated. The logistic regression method was deployed for the analysis of categorical variables while the GLM procedure was applied for the analysis of continuous variables. The average conception rate of sex sorted and conventional semen was 48.3 and 63.8%, respectively. The utilisation of sex sorted semen resulted in 91.1% female calves. The conception rate, number of services per conception, gestation length, calf birth weight and the calf sex ratio were among the reproductive variables that were significantly influenced by the semen sexing. A greater number of services per conception and calving ease score were observed in hot and temperate semiarid areas. These climatic regions also provided a lower incidence of female calf births compared to the cold semiarid regions. Our results highly reaffirm the previous findings on the reproductive performance of sex sorted semen. Yet, climatic and management practices of a herd within a special climate have to be considered when deciding for utilisation of sex sorted semen in a dairy farm. ARTICLE HISTORY

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Section: Conception Rate and The Number Of Services Per Conceptionsupporting

confidence: 90%

Reproductive performance of sexed versus conventional semen in Holstein heifers in various semiarid regions of Iran

Joezy-Shekalgorabi

Maghsoudi

Mansourian³

2017

Italian Journal of Animal Science

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“…In a study that compared sexed semen insemination of heifers inseminated 54 h versus 60 h after removal of an intravaginal progesterone-releasing device, the pregnancy per AI was higher in the heifers inseminated 60 h after progesterone removal. 21 Although not statistically significant, Noonan et al also reported a trend for higher pregnancy per AI in sex-sorted inseminations that occurred more than 50 h after removal of the progesterone-releasing device. Although the data gathered in this study offered no insight, it is possible that the unusually early FTAI may have reduced the relative pregnancy per AI achieved by sexed semen.…”

Section: Discussionmentioning

confidence: 93%

“…22 The preferred synchronisation protocol of the participating farm in our study resulted in the heifers being inseminated 44 h after removal of the intravaginal progesteronereleasing device, 10 h earlier than typically recommended (and 16 h earlier than in the previous research). 21 Body weight significantly affected pregnancy per AI in heifers inseminated with non-sexed semen (P = 0.004). Noonan et al achieved higher pregnancy per AI for both sexed and non-sexed semen compared with our study, as well as a relative pregnancy per AI of sexed semen of 0.72 after inseminating heifers 47-51.4 h after removal of the progesterone-releasing device.…”

Section: Discussionmentioning

confidence: 98%

“…20 Similarly, Noonan et al reported a 3.4-fold increase in pregnancy per AI in heifers that expressed oestrus immediately prior to FTAI when sexed semen was used, whereas only a 1.5-fold increase in pregnancy per AI occurred in heifers that expressed oestrus when non-sexed semen was used. 21 This suggests that oestrus expression at FTAI is a better predictor of pregnancy following insemination with sexed semen than the diameter of the pre-ovulatory follicle.…”

Section: Discussionmentioning

confidence: 99%

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Effect of insemination site and diameter of the pre‐ovulatory follicle on the odds of pregnancy in heifers using sexed or non‐sexed semen

et al. 2017

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“…Inseminacja w rujach synchronizowanych zapewniała niższy wskaźnik zacieleń niż po naturalnych (1). Unasiennianie samic później niż 50 h po usunięciu wkładki CIDR miało -w odniesieniu do wskaźnika zacieleń -przewagę nad wcześniejszą inseminacją (48). Potwierdzają to inne badania, w których jałówki inseminowano 60 h i 54 h po usunięciu wkładki CIDR.…”

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Sex-sorted sperm in farm animals: scale of use, the effectiveness of insemination, risk factors

Jaśkowski

Woźna

Gehrke

2017

Medycyna Weterynaryjna

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The aim of the study was to present the scale of use, risk factors and possibilities, which sorter semen gives in biotechnics used in reproduction of cattle. Modern sorters allow for the evaluation of 6 million X and Y spermatozoa per hour. Sex-sorted semen, which is commercially used, contains 2.1 x 106 of spermatozoa. It is used mostly in AI of milk heifers, mainly in large cattle herds. Sorted semen containing Y spermatozoa is sold less often in the world than the one with X spermatozoa. The percentage of the desired sex of the young is higher than 90. The pregnancy rate after application of sorted semen is about 20–25% lower than after insemination of non-sorted semen and depends on a number of factors. The main factors are: breed of female, service number, the herd of origin, the depth of semen deposition, the bull producing semen, ambient temperature and technical parameters during sperm sorting. A number of methods have been developed to improve conception rate, including timed artificial insemination (TAI) and synchronization of heat and ovulation. Results of donor inseminations with the use of sorter semen are presented, with the lower percentage of embryos suitable for the transfer and embryos of the highest quality highlighted. Previous studies do not indicate a reduction of the conception rate after the transfer of embryos obtained in vitro and in vivo after fertilization using sorted semen. It remains difficult to justify a significant increase in the frequency of stillbirths of bulls after using sorted sperm. Similarly, 16% of stillbirths of bulls were observed after embryo transfer, when donors were inseminated with sorter semen. The percentage of stillbirths of bulls after embryo transfer with the use of conventional semen is 9%. The sorted semen is not often used for inseminations in pigs, sheep and goats.

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Factors associated with fertility of nulliparous dairy heifers following a 10‐day fixed‐time artificial insemination program with sex‐sorted and conventional semen

Abstract: Increased fertility was associated with larger heifers and heifers that expressed oestrus, particularly when sexed-sorted semen was used. Variation in the timing of AI with respect to device removal between 47 and 51.4 h did not adversely affect conception rates.

Cited by 12 publications

References 16 publications

Reproductive performance of sexed versus conventional semen in Holstein heifers in various semiarid regions of Iran

Reproductive performance of sexed versus conventional semen in Holstein heifers in various semiarid regions of Iran

Effect of insemination site and diameter of the pre‐ovulatory follicle on the odds of pregnancy in heifers using sexed or non‐sexed semen

Sex-sorted sperm in farm animals: scale of use, the effectiveness of insemination, risk factors

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