Article
Agriculture, Dairy & Animal Science
Jacqueline Koch, Laura Patricia Weber, Maike Heppelmann, Fritjof Freise, Malte Klingelmann, Lisa Bachmann
Summary: Recommendations for thawing methods of frozen bovine semen vary, and clear data evaluating their influence on fertility are contradictory. This study aimed to investigate the influence of different thawing methods of frozen bull semen in artificial insemination (AI) of dairy cows on conception rate (CR) under practical conditions and to determine further possible influencing factors on the success of AI in order to provide recommendations for practical use. The results showed no significant difference in CR between the thawing methods, but lactation number, month of insemination, and AI method were found to have effects on CR. Based on the data, no clear recommendation for semen thawing method in dairy reproduction can be made. The study suggests that the reproductive performance of dairy cows is mainly influenced by factors such as natural heat insemination, lactation number, and season of insemination, highlighting the importance of focusing on cow conditions.
Article
Agriculture, Dairy & Animal Science
J. N. Ketchum, R. C. Bonacker, C. M. Andersen, E. G. Smith, K. S. Stoecklein, C. M. Spinka, J. M. Thomas
Summary: The experiment evaluated delaying artificial insemination (AI) by 6 hours and its impact on pregnancy rates, with no significant difference seen. However, a higher proportion of heifers exhibited estrus before the first timepoint when AI was delayed.
ANIMAL REPRODUCTION SCIENCE
(2021)
Article
Agriculture, Dairy & Animal Science
D. P. Walsh, A. G. Fahey, P. Lonergan, M. Wallace
Summary: This study used a stochastic simulation model to estimate the potential economic benefit of using timed artificial insemination (TAI) in combination with conventional unsorted and sexed semen in a high-producing, pasture-based production system. The study found that TAI and sexed semen are complementary technologies that can increase genetic gain and profitability in a dairy production system.
JOURNAL OF DAIRY SCIENCE
(2022)
Article
Multidisciplinary Sciences
Glauco Rodrigues Carvalho, Weslem Rodrigues Faria, Vinicius Pimenta Delgado Ribeiro Nardy, Admir Antonio Betarelli Junior
Summary: Dairy farming plays a significant role in the Brazilian agricultural sector, contributing to the rural economy. Artificial insemination has become crucial for genetic improvement, making semen doses of bulls highly marketable. The study reveals that proven bulls command a premium price, Gir bulls' semen doses are more expensive, and AI firm ALTA offers a discount. Sexed doses are highly valued, while semen doses from dead bulls are pricier.
Article
Agriculture, Dairy & Animal Science
Keisuke Koyama, Tomoaki Kubo, Takeshi Koyama, Yoshiyuki Takahashi
Summary: This study investigated the relationship between parity and the optimal insemination-ovulation interval (IOI) in lactating dairy cows. It was found that ovulation occurring 6-12 hours after artificial insemination (AI) was associated with the highest conception rate in multiparous cows. However, the effect of IOI on the conception rate in primiparous cows was insignificant. Therefore, careful determination of the timing of AI is essential in multiparous cows.
REPRODUCTION IN DOMESTIC ANIMALS
(2023)
Article
Agriculture, Dairy & Animal Science
G. E. Seidel Jr, J. M. DeJarnette
Summary: The successful sorting of sperm based on the presence of the X or Y chromosome was first reported in the early 1980s, and the first live births were reported in rabbits in 1988. Technological advancements have led to the commercialization of sex-sorted semen for cattle producers in the early 2000s. Initially, low throughput limited the use of sex-sorted semen, resulting in lower conception rates compared to unsorted semen. However, improvements in sorting equipment and other aspects of sperm processing have increased the number of sorted sperm and improved conception potential. More recently, the strategic use of sex-sorted semen, coupled with genomic technologies, has led to an increase in the use of beef semen in dairy herds. Estimates suggest that sex-sorted semen is rapidly gaining a significant market share in North America. The primary application is to accelerate genetic progress and enhance biosecurity through in-house production of replacement animals, but other potential applications are also being explored.
ANIMAL REPRODUCTION SCIENCE
(2022)
Article
Agriculture, Dairy & Animal Science
Yanmin Guo, Zhaobin Fan, Fuwei Zhao, Shihao Ge, Hanping Chu, Zhongfeng Wei, Rajwali Khan, Muhammad Faisal, Amel Ayari-Akkari, Habab M. Yassin, Xianlin Zhao
Summary: This study investigated the difference between sex-sorted and non-sex-sorted frozen semen in Holstein Friesian cattle. Significant variations were found in semen quality parameters, including motility, vitality, acrosome integrity rate, and anti-oxidative enzyme activity. The results showed that non-sorted sperm had higher acrosome integrity and motility compared to sex-sorted sperm. Additionally, the non-sex-sorted semen had higher levels of CAT and lower levels of SOD, GSH, and GSH-Px activity compared to sexed semen.
REPRODUCTION IN DOMESTIC ANIMALS
(2023)
Article
Agriculture, Multidisciplinary
C. Morgan-Davies, J. Kyle, I. A. Boman, H. Wishart, A. McLaren, S. Fair, P. Creighton
Summary: This trans-European study investigates the impact of different sheep management strategies on farm labor input, carbon footprint, and on-farm profitability. Results demonstrate that efficiency in carbon and labor can be increased by adopting technology, changing breeding management, or ewe breed on sheep farms.
AGRICULTURAL SYSTEMS
(2021)
Article
Agriculture, Dairy & Animal Science
Thabang Luther Magopa, Masindi Lottus Mphaphathi, Thendo Mulaudzi
Summary: The study compared oestrous synchronization expression and conception rate following timed artificial insemination (TAI) with frozen-thawed X-sexed or unsexed semen in dairy and beef cows. The results showed that overall, dairy cows had higher conception rates on Day 35 compared to beef cows. Dairy cows also had higher incidence of pregnancy losses between Days 66 and 95 when compared to beef cows.
REPRODUCTION IN DOMESTIC ANIMALS
(2023)
Article
Agriculture, Dairy & Animal Science
N. Oosthuizen, P. L. P. Fontes, R. Oliveira Filho, C. R. Dahlen, D. M. Grieger, J. B. Hall, S. L. Lake, C. R. Looney, V. R. G. Mercadante, B. W. Neville, G. A. Perry, J. G. Powell, L. D. Prezotto, G. E. Seidel, R. S. Walker, R. C. Cardoso, K. G. Pohler, G. C. Lamb
Summary: Pre-synchronization of ovulation timing among heifers combined with delayed TAI resulted in increased pregnancy rate compared with using sex-sorted semen, yet did not affect the proportion of heifers pregnant after TAI.
ANIMAL REPRODUCTION SCIENCE
(2021)
Article
Agriculture, Dairy & Animal Science
Lingwei Sun, Mengqian He, Caifeng Wu, Shushan Zhang, Jianjun Dai, Defu Zhang
Summary: Soy lecithin (SL) and its nanoparticles (nano-SL) can effectively prevent spermatozoa cryodamage during cryopreservation, with a concentration of 1.0% nano-SL showing the most positive impact on post-thawing semen quality and fertility in roosters. The addition of nano-SL reduced oxidative stress levels, improved sperm motility and mitochondrial activity, and enhanced fertility and hatchability in rooster semen after artificial insemination.
Article
Agriculture, Dairy & Animal Science
Vibuntita Chankitisakul, Wuttigrai Boonkum, Theerapat Kaewkanha, Maruay Pimprasert, Ruthaiporn Ratchamak, Supakorn Authaida, Pachara Thananurak
Summary: The study found that the NCAB semen extender supplemented with serine and stored at a low temperature (5 degrees C) significantly improved rooster sperm quality and fertilizing ability, achieving higher fertility and hatchability rates compared to other extenders during storage.
Article
Agriculture, Dairy & Animal Science
C. M. Tippenhauer, J. -l. Plenio, W. Heuwieser, S. Borchardt
Summary: The objective of this observational study was to evaluate the association between increased physical activity at first artificial insemination (AI) and subsequent pregnancy per AI (P/AI) in lactating Holstein cows following spontaneous estrus or a timed AI (TAI) protocol. The study found that high intensity physical activity was positively correlated with pregnancy rate, suggesting that increased physical activity at the time of AI may improve fertility in cows. Rating: 8/10.
JOURNAL OF DAIRY SCIENCE
(2023)
Article
Agriculture, Dairy & Animal Science
M. H. C. Pereira, B. I. Cappellozza, A. K. M. Kloster, M. Mamedes, J. L. M. Vasconcelos
Summary: This study evaluates the effects of conventional and sexed-semen on the reproductive performance of dairy females. The results suggest that sexed-semen may have an impact on the pregnancy rate of cows under different experimental conditions, but other factors were not found to significantly affect the fertility of cows assigned to conventional or sexed-semen.
ANIMAL REPRODUCTION SCIENCE
(2023)
Article
Agriculture, Dairy & Animal Science
Manas Kumar Patra, Jisna Kuttiyeri Sasidharan, Atul Singh Rajput, Renu Sharma, Md Rehan Ahmad Reza, Goutam Kumar Das, Atul Kumar Singh Tomar, Subrata Kumar Ghosh, Gyanendra Kumar Gaur
Summary: Sexed semen was evaluated for its performance in Tharparkar cows, and the study found that the double AI protocol had a significantly higher conception rate compared to the single AI protocol. The timing of insemination after oestrus detection also influenced the conception rate. Additionally, the parity of the cows also had an impact on the conception rate.
REPRODUCTION IN DOMESTIC ANIMALS
(2023)