Conception Rate Research Articles

Engaging young people with sexual health services in general practice surgeries - A qualitative study of health care professionals.

Evidence to date suggests that young people are becoming more sexually active and are forming relationships during the early stages of their lives, sometimes engaging in sexual risk-taking, which contributes to high rates of conception and sexually transmitted infections (STIs). Young people at risk of adverse sexual health outcomes are the least likely to engage with reproductive and sexual health promotion programmes and services (RSHPPs), especially in mainstream clinics such as general practice (GP) surgeries. The study aimed to explore the views and experiences of service providers. A qualitative approach to explore the views and experiences of designing and implementing RSHPPs for young people in GP surgeries was used. A total of seven participants were interviewed, including four general practitioners (GPs), two of whom were managers at the practice; one nurse; one healthcare and support worker; and one practice manager. The context of RSHPPs such as local health priorities and partnerships to address STIs and unplanned pregnancies among young people contribute to the implementation and engagement of young people with RSHPPs. Training of GPs, nurses, and support workers helps develop confidence and overcome personal factors by promoting effective engagement of young people with RSHPPs. Addressing local health priorities such as reducing teenage pregnancies and STIs requires organisations to provide RSHPPs in both non-clinical and clinical settings to ensure that RSHPPs are accessible to young people. There is room for improvement in access to RSH for young people in GP surgeries by addressing organisational and structural barriers to access.

Efficacy of fertility-sparing treatment with LNG-IUS is associated with different ProMisE subtypes of endometrial carcinoma or atypical endometrial hyperplasia.

To determine whether proactive molecular risk classifier for endometrial cancer (ProMisE) could be used to assess the prognosis of patients with atypical endometrial hyperplasia (AEH) or early-stage endometrial cancer (EC) treated with levonorgestrel-releasing intrauterine system (LNG-IUS). A retrospective cohort study was conducted among 93 AEH or early-stage EC patients who received LNG-IUS to preserve fertility . By immunohistochemistry and gene sequencing, 4 subtypes of ProMisE were identified (p53 wild type [p53 wt], mismatch repair-deficient [MMRd], p53-abnormal, and POLE-mutated). The primary outcome was the time to complete response (CR) after LNG-IUS therapy. Secondary outcomes included the recurrence rate after CR and success rate of conception. Among the 93 patients, 15 (16.1%) were classified as MMRd, 6 (6.5%) as POLE-mutated, 5 (5.4%) as p53-abnormal, and 67 (72.0%) as p53 wt. Comparison of serum cancer antigen 125, family history of tumor, and positive rates of programmed cell death 1 ligand 1 protein and Ki67 protein in 4 groups showed statistically significant differences (p<0.05). Patients with the p53-abnormal subtype had the lowest overall CR rate (40%) and the highest recurrence rate (2/2). Patients with POLE-mutated subtype had the best prognosis, and all 6 patients achieved CR. When patients achieved complete remission, assisted reproductive technology was more likely to help them conceive than natural conception (p<0.05). Patients with early-stage EC or AEH who are more likely to benefit from fertility-sparing treatment can be identified using ProMisE classifier. Patients with POLE-mutated are suitable for fertility-sparing treatment with LNG-IUS.

Assessing Natural Conception Rates after Laparoscopic Intervention for Endometriosis-Induced Infertility

Assessing Natural Conception Rates after Laparoscopic Intervention for Endometriosis-Induced Infertility

Sperm HSP70: may not be an age-dependent gene but is associated with field fertility in Bali bulls (Bos sondaicus).

This study aimed to analyze the characteristics of the HSP70 gene and protein in spermatozoa of Bali bulls of different age groups and to examine its potential as a biomarker determining bull fertility. This study used frozen semen produced from six Bali bulls divided into two groups based on age (≤ 9 years and ≥ 12 years). Parameters of frozen semen quality analyzed included sperm motility and kinetics using computer-assisted semen analysis, sperm morphological defects using Diff-Quick staining, acrosome integrity using FITC-PNA staining, and DNA fragmentation using acridine orange staining. HSP70 gene expression characterization was analyzed using qRT-PCR, and HSP70 protein abundance was analyzed using enzyme immunoassays. Fertility field data were obtained by analyzing the percentage conception rate for each bull based on the artificial insemination service data contained in the Indonesian-integrated system of the National Animal Health Information System (iSIKHNAS). The results showed significant differences (P<0.05) in total and progressive motility, morphological defects of the neck and midpiece, and tail of sperm, and acrosome integrity between the age groups of Bali bulls. HSP70 gene expression and protein abundance showed no significant differences (P>0.05) in different age groups. HSP70 gene expression correlated with fertility rate (P<0.05). Age affected several semen quality parameters but did not affect HSP70 gene expression and protein abundance. The HSP70 gene molecule could be a biomarker that determines the fertility of Bali bulls.

Does GnRH treatment at TAI regardless of estrus occurrence increase pregnancy rate in crossbred Bos taurus suckled cows?

The impact of GnRH treatment on the day of TAI in beef cows has received limited investigation, especially concerning its association with estrus expression. Consequently, two experiments were conducted to assess the potential of GnRH treatment on the day of TAI to enhance fertility according to the expression or not of estrus in beef cows. Experiment 1 aimed to determine ovulation rate and luteal function, while Experiment 2 aimed to determine the effect of the two GnRH treatment approaches on pregnancy rate. In Experiment 1, multiparous Brangus suckling cows (n = 17) were submitted to an 8-day TAI protocol. Estrus occurrence was evaluated based on chalk removal on D10 (TAI) and cows were assigned to receive GnRH (25µg lecirelin; im) according to the group: GnRH (n = 7), regardless of estrus expression; or selectGnRH (n = 10), only cows not detected in estrus. Ovulation rate occurring until 77h after IVD removal did not differ (p = 0.17) between GnRH (85.7%; 6/7) and selectGnRH (100%; 10/10). Also, corpus luteum size and serum progesterone concentration were not affected (p>0.05) by treatments. In Experiment 2, crossbred taurine suckled cows (n = 384) were submitted to the same protocol as described in Experiment 1 and were randomly allocated to GnRH or selectGnRH groups. There was no difference in P/AI between groups (selectGnRH = 55.6%; GnRH = 54.3%; p = 0.7) 30 days after TAI. As expected, there was a pronounced effect (p<0.0001) of estrus expression on P/AI (Estrus = 61.5%; No estrus = 33.0%), regardless of group. In summary, ovulation timing and rate and luteal function did not differ between groups. Also, GnRH administration only in cows that do not show estrus is recommended, considering hormone savings and similar conception rate.

Impact of global warming on the productive and reproductive efficiency of goats

Global warming is the rise in the average temperature of Earth's atmosphere and oceans. Climate change has had an enormous impact on domestic animal production system. Thermal stress is the most prominent impact of global warming in goat production resulting in a range of physiological, metabolic and production disorders. Negative energy balance due to poor food quality and heat stress cause endocrinal disturbances: increased frequency of LH-waves (anovulatory cycles), increased diameter of dominant follicle (lower concentration of oestradiol)) and increased system or intrafollicular level of insulin–like growth factor-I (IGF-I). Glucocorticoids inhibit the release of gonadotrope hormones, which reduces fertility probably due to ovulation failure and reduced growth and maturation of follicles. A high temperature several days prior to and after mating was found to reduce conception rate, since heat stress may negatively affect oocytes, spermatozoa and embryos. Increased ambient temperature also affects animal health, reproduction and nutrition, resulting in poor reproductive performance, low product quality and quantity, or the possible outbreak of new diseases. The indirect impact of global warming is manifested in the reduced production of fodder used to feed animals due to long-term droughts or floods. In addition to decreased quantity of animal feed, the quality of fodder grown during droughts or floods is also questionable. As a result of feeding with poor quality feed and insufficient quantities, numerous metabolic and endocrine disorders occur that can significantly affect fertility and sexual performance in goats.

Excluding alanine from minimum essential medium (MEM) nonessential amino acid supplementation of the culture medium facilitates post-fertilization events and early cleavages of bovine oocytes fertilized in vitro.

Embryonic transfer of bovine blastocysts produced by in vitro fertilization is widely utilized-despite a compromised conception rate. It has been suggested that a set of four evaluation criteria for judging the quality of embryos, based on the timing of early cleavages and proper morphologies of embryos, can effectively predict pregnancy success. These blastocysts are hereafter referred to as four-criteria-compliant blastocysts. The same criteria should be used to modify the culture media to improve embryo quality. For example, culture media is often supplemented with nonessential amino acids (NEAA) at a uniform concentration despite the major variation in their concentration in the oviductal fluid. In the present study, the effects of the embryo culture medium, namely CR1, supplemented with all seven MEM NEAA or six of them, excluding one at a time, were examined. All media, except for the medium that did not contain proline and serine, tended to improve the efficiency of producing four-criteria-compliant blastocysts, and excluding alanine was particularly effective. The absence of alanine resulted in the rapid occurrence of the first cleavage and pronuclear formation of fertilized oocytes in the alanine-free medium compared to that in the medium containing alanine. These results suggested that alanine hinders certain events involved in the progression of early embryogenesis, which is necessary to achieve the four criteria that provide a benchmark for pregnancy. Therefore, a significantly higher percentage of embryos satisfied the recommended criteria and developed into four-criteria-compliant blastocysts when developed in alanine-free medium than in alanine-containing medium.

Developing a Sow Vulva Volume Estimation Pipeline Based on LiDAR Imagery and Deep Learning

Highlights An artificial intelligence-enabled imagery data processing pipeline. Sow vulva swelling can be quantified using imagery automatically. Biological signs of sow estrus are quantified. Abstract. Accurate and timely estrus detection is one of the critical factors for improving the conception rate of sows in swine reproduction. Estrus detection in the current industry relies on experienced breeding technicians using the back pressure test method, which is time-consuming, labor-intensive, and subjective. This study aimed to develop an image-processing pipeline that could predict the onset of estrus by monitoring the variation of the vulva volume of sows. A robotic imaging system consisting of a LiDAR camera was used to collect depth and infrared (IR) images of sows multiple times per hour. The developed image processing pipeline consisted of a deep learning model (MobileNet) to exclude images with defective postures (e.g., excreting posture, vulva region not showing) for vulva detection. The selected images were further processed to (1) segment sow vulva regions (3-dimensional surface) using a U-Net model, (2) exclude incorrectly segmented 3D vulva surfaces using a MobileNet model, and (3) calculate the vulva volume using the segmented 3D vulva surface. Results show that all three models achieved high test accuracy of 94.8% (MobileNet 1), 96.7% (U-Net), and 100% (MobileNet 2). The vulva volume was calculated using the developed pipeline for all the test sows. Daily average vulva volume showed a noticeable increase in all sows at 0-1 day prior to the onset of estrus. This study concluded that the developed image processing pipeline could automatically detect vulva swelling, which may be used as a biological sign indicating the onset of post-weaning estrus in sows. Keywords: 3D camera, Digital agriculture, Estrus detection, Robotic imaging system, Swine reproduction.

Serum-free spontaneously immortalized bovine oviduct epithelial cell conditioned medium promotes the early development of bovine in vitro fertilized embryos.

Embryonic transfer of bovine blastocysts produced using in vitro fertilization (IVF) is widely used, although the challenge of compromised conception rates remains. Using bovine oviduct epithelial cells (BOEC) to improve embryo culture conditions has attracted attention, particularly since the recent discovery of extracellular vesicles from BOEC. The selection of embryos for transfer has also been the subject of various studies, and a set of evaluation criteria to predict pregnancy success has been suggested, in which the embryos are judged by their kinetics and morphology at the early stages. In the present study, we established a spontaneously immortalized BOEC line (SI-BOEC) and examined the effects of conditioned medium on IVF embryos, focusing on the results of the recommended criteria. A modified KSOM (mKSOM) was used to prepare conditioned media. Presumptive zygotes were cultured in mKSOM (control), SI-BOEC-conditioned medium, mKSOM supplemented with sediment (pellet) collected after the ultracentrifugation of the conditioned medium (mKSOM/sediment), and the supernatant. A significantly higher percentage of embryos satisfied the recommended criteria when grown in the conditioned medium than in the mKSOM. A higher proportion of embryos developed into blastocysts after achieving the four criteria. A similar tendency was observed when grown in mKSOM/sediment compared to mKSOM; however, this was not observed in the supernatant. Vesicles with a size similar to that of exosomes were observed in the sediment. In conclusion, the culture medium conditioned by SI-BOEC promoted the production of bovine blastocysts that satisfied the four evaluation criteria recommended for embryo selection.

Fibroids and unexplained infertility treatment with epigallocatechin gallate: a natural compound in green tea (FRIEND) – protocol for a randomised placebo-controlled US multicentre clinical trial of EGCG to improve fertility in women with uterine fibroids

IntroductionUterine fibroids affect 30%–77% of reproductive-age women and are a significant cause of infertility. Surgical myomectomies can restore fertility, but they often have limited and temporary benefits, with postoperative complications...

The proteomic landscape of sperm surface deciphers its maturational and functional aspects in buffalo.

Buffalo is a dominant dairy animal in many agriculture-based economies. However, the poor reproductive efficiency (low conception rate) of the buffalo bulls constrains the realization of its full production potential. This in turn leads to economic and welfare issues, especially for the marginal farmers in such economies. The mammalian sperm surface proteins have been implicated in the regulation of survival and function of the spermatozoa in the female reproductive tract (FRT). Nonetheless, the lack of specific studies on buffalo sperm surface makes it difficult for researchers to explore and investigate the role of these proteins in the regulation of mechanisms associated with sperm protection, survival, and function. This study aimed to generate a buffalo sperm surface-specific proteomic fingerprint (LC-MS/MS) and to predict the functional roles of the identified proteins. The three treatments used to remove sperm surface protein viz. Elevated salt, phosphoinositide phospholipase C (PI-PLC) and in vitro capacitation led to the identification of N = 1,695 proteins (≥1 high-quality peptide-spectrum matches (PSMs), p < 0.05, and FDR<0.01). Almost half of these proteins (N = 873) were found to be involved in crucial processes relevant in the context of male fertility, e.g., spermatogenesis, sperm maturation and protection in the FRT, and gamete interaction or fertilization, amongst others. The extensive sperm-surface proteomic repertoire discovered in this study is unparalleled vis-à-vis the depth of identification of reproduction-specific cell-surface proteins and can provide a potential framework for further studies on the functional aspects of buffalo spermatozoa.

AN OVERVIEW OF SEMEN EXTENDERS AND FUTURE CHALLENGES TO DEVELOPMENT OF ARTIFICIAL INSEMINATION IN CAMEL

Artificial insemination is an emerging technique to ensure productivity and rapid genetic improvement in camels. This technique is not well developed due to involving different challenging factors because of semen collection, viscosity, nature of ejaculates, dilution in stabilized semen extenders, processing and cryopreservation, challenging related to artificial insemination and low conception rate. Numerous bovine commercial and non-commercial extenders with slight modification have been utilized for camel semen cryopreservation with little success. The gelatinous nature of the camel semen is one of the major challenges for proper evaluation, dosage calculation and cryopreservation. Various techniques have been used to liquefy the semen within a short spin of time without compromising the quality of sperm cells. This review provides precise data that appears in the peer reviews journals collected most of information to highlight the different semen extenders, addition of different supplementation and essential additives in semen extenders, challenges factors regarding camel bull and camel cow involved in success of artificial insemination.

Effect of diluters on frozen semen production of Black Bengal Goat

The present study was undertaken to investigate the efficacy of three diluters (Triladyl, Andromed and Tris) for the production of frozen semen in Black Bengal goat and their effect on conception rate. Over the course of 6 months, data from six bucks were collected. Each collected sample was diluted with Triladyl, Andromed and Tris diluter, filled into 0.50 ml straws, sealed and equilibrated at 5℃ for freezing. The motility, viability and morphology were evaluated after dilution and in every step of cryopreservation (after equilibration, after freezing and after thawing). It became clear that motility and sperm viability of the frozen thawed semen differed significantly (p&lt;0.05) but differed insignificantly (p&gt;0.05) immediate after dilution among the diluters. The motility of frozen thawed semen was 42.50%±1.71, 34.67%±1.67 and 28.71%±1.55 in Triladyl, Andromed and Tris diluter, respectively. The viability of frozen thawed semen was 40.51%±1.78, 32.24%±1.52 and 26.84%±1.56 in Triladyl, Andromed and Tris diluter, respectively. In case of morphology, it differed insignificantly (p&gt;0.05) among the diluters in every step of cryopreservation. Higher percentage of normal spermatozoa was found in Triladyl based diluter (87.11%) in frozen thawed semen. After 15 days of sample preparation, the motility of prepared sample was again checked to ensure the quality of frozen semen in liquid nitrogen (LN). It differed insignificantly (p&gt;0.05) with frozen thawed semen after 24 hours of production. The obtained conception rate was 38% for Triladyl, 35% for Andromed and 27% for Tris diluter. The results of the study revealed that cryopreservation of buck semen revealed good results with Triladyl diluter followed by Andromed and Tris diluter. Bangladesh Journal of Animal Science 52 (4): 105-113

Effect of diluters on frozen semen production of Black Bengal Goat

The present study was undertaken to investigate the efficacy of three diluters (Triladyl, Andromed and Tris) for the production of frozen semen in Black Bengal goat and their effect on conception rate. Over the course of 6 months, data from six bucks were collected. Each collected sample was diluted with Triladyl, Andromed and Tris diluter, filled into 0.50 ml straws, sealed and equilibrated at 5℃ for freezing. The motility, viability and morphology were evaluated after dilution and in every step of cryopreservation (after equilibration, after freezing and after thawing). It became clear that motility and sperm viability of the frozen thawed semen differed significantly (p&lt;0.05) but differed insignificantly (p&gt;0.05) immediate after dilution among the diluters. The motility of frozen thawed semen was 42.50%±1.71, 34.67%±1.67 and 28.71%±1.55 in Triladyl, Andromed and Tris diluter, respectively. The viability of frozen thawed semen was 40.51%±1.78, 32.24%±1.52 and 26.84%±1.56 in Triladyl, Andromed and Tris diluter, respectively. In case of morphology, it differed insignificantly (p&gt;0.05) among the diluters in every step of cryopreservation. Higher percentage of normal spermatozoa was found in Triladyl based diluter (87.11%) in frozen thawed semen. After 15 days of sample preparation, the motility of prepared sample was again checked to ensure the quality of frozen semen in liquid nitrogen (LN). It differed insignificantly (p&gt;0.05) with frozen thawed semen after 24 hours of production. The obtained conception rate was 38% for Triladyl, 35% for Andromed and 27% for Tris diluter. The results of the study revealed that cryopreservation of buck semen revealed good results with Triladyl diluter followed by Andromed and Tris diluter. Bangladesh Journal of Animal Science 52 (4): 105-113

Comparison of ultrasonographic measures of reproductive tract in Thai swamp buffalo heifers and cows

Although artificial insemination (AI) technology is widely used in buffalo breeding in Thailand, AI in buffaloes has a lower conception rate compared to AI in beef cattle. It is crucial to understand the development of the ovary and reproductive system of buffalo heifers and cows. The objective of the present study was to evaluate the reproductive tract characteristic using ultrasound measurements during the luteal and follicular phases in Thai swamp buffalo heifers and cows. The studies of reproductive tract were conducted in buffalo cows (n=8; BCS=3.38) and heifers (n=8; BCS=3.25). The reproductive tract was evaluated by measuring the size of the ovary, dominant follicle, CL, uterine horn, cervix, and vulva. The buffalo cows had larger diameter of the cervix and vulvar width (P&lt;0.05) compared with those of heifers. In the follicular phase, buffalo cows had a mean ovarian diameter (ipsilateral POF) of 2.35 cm, and heifers had a mean ovarian diameter of 2.24 cm (P&gt;0.05). The average preovulatory follicle diameter was 1.29 cm in buffalo cows and 1.18 cm in heifers (P&gt;0.05). In the luteal phase, the mean ovarian diameter (ipsilateral CL) of buffalo cows was significantly larger than heifers (P&lt;0.05; 2.46 vs. 2.09 cm, respectively). The diameters of the CL in buffalo heifers and cows were 1.27 and 1.47 cm, respectively (P&gt;0.05). Buffalo cows and heifers have no differences in ovarian components in the follicular and luteal phases, but there are differences in the size of the reproductive tract, which reproductive tract of buffalo cows is larger than heifers.

Influence of Blood Glucose, Total Protein and Haemoglobin at The Time of Induced Estrus on Conception Rate on Anestrus Crossbred Cows

The present study was conducted to evaluate the influence of blood glucose, total protein and haemoglobin at the time of induced estrus on conception rate in 30 postpartum anestrus crossbred dairy cows. The cows were treated with progesterone intravaginal (CIDR) based estrus induction protocol with double fixed timed inseminations at 12 and 24 h after injection of last GnRH. estrus induction response was 100% with majority of the cows (80%) showed intermediate intensity of estrus. On the day of first AI, blood was collected from all the animals for the estimation of glucose, total protein and haemoglobin. The mean time to onset of estrus from the time of removal of CIDR was 44.85 ± 7.23 h. The overall conception rate in the present study was 30 % (9/30). In the present study, the mean values of glucose, total protein and haemoglobin at the time of estrus were 43.81 ± 1.14 mg/dl, 7.78 ± 0.24 g/dl and 8.68 ± 0.22 g/dl respectively. The mean glucose, total protein and haemoglobin levels in the anestrus cows which were included in the study are lower than the normal range. There is no significant different in the biochemical parameters among the cows showing weak, intermediate and intense intensity of estrus. Similarly, there is no significant difference in the biochemical parameters between the cows that conceived and cows not has not conceived. The findings in the present study clearly indicates that poor nutritional status may be the cause for the anestrus condition of the animal under field conditions.

Efficacy of Ozone and Other Alternative Intrauterine Therapies in Infectious Repeat Breeder Cows.

The study was undertaken to evaluate the therapeutic efficacy of Ozone, E. Coli LPS, Autologous plasma, Neem oil, and Lugol’s iodine in 100 infectious repeat breeder cows. The animals were divided in 5 different groups viz. Group-I, Group-II, Group-III, Group-IV and Group-V treated with Ozone @ 55µg/ml in 60ml distilled water, E. Coli LPS @100mcg in 30 ml sterile PBS, Autologous plasma @ 30 ml, Neem oil @ 10µg/ml in 30 ml distilled water, Lugol’s iodine 1:25 in 30ml normal saline, intrauterine route in 20 cases, respectively, Group-V of 20 animals was kept as control. AI was done in recovered cases. On follow up, recovery rate in treatment group were found as 75.00, 80.00, 65.00, 75.00 and 50.00 per cent in groups I to V, respectively. The conception rate was found as 68.42, 73.68, 55.00, 63.15 and 53.33 per cent in cows in Group-I to V, respectively. Pregnancy rate was observed that 65.00, 70.00, 50.00, 60.00 and 40.00 per cent cows from groups I to V, respectively. On conclusion, infectious repeat breeder cows treated with E. Coli LPS showed highest recovery rate, conception rate and pregnancy rate than the other treatment groups in this research study.

Management of Post-partum Complete Cervico-uterine Prolapse in Crossbred Jersey Cow

Post-partum uterine prolapse is a very common obstetrical problem as it affects the future breeding and production of an animal. It generally leads to delay in return to oestrus and subsequently reduction in conception rate and thus increase in the inter calving period of a female animal. In the present case, in a postpartum crossbred cow, replacement and repositioning of the cervix and uterus was done under caudal epidural anaesthesia with the horizontal mattress suture on vulva. The suture was removed after 14 days on complete recovery of the animal.

CASA Based Assessment of Kangayam bull semen processed with different extenders and Conception rate following AI

Semen extenders are the essential components of cryopreservation of semen. Identification of suitable and ready to use semen extender is the need of hour for the rapid propagation of Kangayam cows through artificial insemination. Kangayam bull, aged 5 years was utilized for the study. The semen was collected twice in a week and each time two ejaculates were collected. A total of 24 ejaculates were utilized for this study. After assessing the general macroscopical examination the semen was subjected to computer aided semen analysis (CASA) for assessing the kinematic parameters in fresh diluted semen, pre freeze and post thawed such as sperm motility, progressive individual motility, VAP, VSL, ALH and LIN were analyzed using CASA. Among all the three extenders, the sperm kinematic parameters during fresh diluted, pre freeze and post thawed semen stages were higher in group III (liposome based extender) followed by group I (TEYG) and in group II (soya bean lecithin based extender). Among the three extenders used, the components of liposome based extender was better and it was able to maintain the structural integrity, plasma membrane integrity and motility in the sperms of the frozen thawed semen than the other two extenders (TEYG and soya bean lecithin based extenders). Further the fertility rate was evaluated by the in vivo insemination of 60 Kangayam cows after 12 hours of onset of estrum. The fertility rate observed was 45.00, 40.00 and 65.00 per cent in groups I, II and III, respectively. The overall conception rate recorded in Kangayam cow was 50.00 per cent. Based on the findings, it was concluded that liposome based extender may be used for cryopreservation of Kangayam bull semen in order to maximize the fertility rate.

Pengaruh umur dan pengalaman inseminator terhadap keberhasilan inseminasi buatan pada sapi perah di wilayah kerja Koperasi Peternak Sapi Bandung Utara (KPSBU) Lembang

This study aimed to evaluate the success rate of artificial insemination (AI) in dairy cows at KPSBU Lembang District based on experience and different ages of inseminators. The research was carried out on December 26, 2022 - January 31, 2023, in Lembang District. The research was conducted using a survey method and the variables measured were the success of artificial insemination including service per conception (S/C), Conception Rate (CR), Non-Return Rate (NRR), and Calving Interval (CI). Data analysis used in this study is a simple correlation analysis and quantitative descriptive. The results showed that the average age of the inseminator was 39 years old, the average inseminator work experience was 19 years. Meanwhile, the average of S/C value was 1.84 time, the CR value was 64.50%, the NRR value was 93%, and CI value with an average of 13 months. The correlation analysis showed that (X) experience and age have no significant effect (p&gt;0,05) on the success of AI based on (Y) S/C and CR. It can be concluded that the success rate of artificial insemination of dairy cows based on S/C and CR in Lembang District was good, but the experience and age of inseminators had not affected the success of artificial insemination in Lembang District