Research advances in reproduction for dairy goats

Luo, Jun; Wang, W; Sun, Shuang

doi:10.5713/ajas.19.0486

Cited by 43 publications

(35 citation statements)

References 91 publications

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“…Lipase, an important inhibitory factor of sperm viability and cryopreservation, is secreted from the bulbourethral gland in goats but not in other livestock [ 6 ]. Several studies have investigated the cryopreservation of black goat semen and have shown the survival rate of sperm was ranges from 60% to 65% [ 21 ], in semen by AI. The present study also found 64.2 ± 7.9 % sperm motility in frozen-thawed semen ( Table 1 ).…”

Section: Discussionmentioning

confidence: 99%

“…Our studies on estrus synchronization has been imposing the optimum protocols to enable favorable synchrony and fertility in Korean black goats, there by generating and introducing simple, practical, and reliable methods for the commercial as well as subsistent farmers. Usually in the commercial goat industry, FSH+CIDR or PMSG+CIDR are most commonly used as effective protocols for estrus synchronisation or superovulation [ 21 ]. In ruminants, the estrus cycle can be synchronized via the insertion of a P4-impregnated intravaginal device, such as CIDR united with eCG [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

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Estrus synchronization and artificial insemination in Korean black goat (Capra hircus coreanae) using frozen-thawed semen

Kim

Lee

Kim³

et al. 2021

J Anim Sci Technol

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Presently, there is an increased demand for livestock products all over the world which has led to more devotion on improving livestock population. Although goats have been bred for a long time in Korea, but there is not much research conducted on traditional Korean black goat (Capra hircus coreanae) compared to other livestock populations. Mutton consumption has been dramatically changing from medicinal use to edible meat and this trend directs the black goat populations declining and also mutton import quantities are increasing consistently. The present study introduced a new estrus synchronizing technique with subsequent artificial insemination (AI) for Korean black goats to enable crossbreeding with non-native breeds for the small or subsistent farmers. Our data highlighted that, the percentage of motile sperm from the electro-ejaculated samples declined significantly after freezing and melting. In addition, the sperm motility significantly declined with regard to sperm incubation period (0, 5, 60, and 120 min at 37℃) and was negatively correlated (64.2 ± 7.9%, 63.3 ± 5.8%, 49.9 ± 6.3%, and 35.9 ± 7.6%, respectively) in frozen-thawed sperm samples. Moreover, the E2 levels were unchanged even 24 h after controlled internal drug releas (CIDR) withdrawal. But, 48 h and 72 h after CIDR removal, E2 levels increased significantly. These data helps us to consider the two time points for AI; CIDR removal after 24 h, at which E2 decreases, and after 48 h, as the time at which progesterone increases. Additionally, the AI after 48 h of CIDR removal group exhibited significantly higher pregnancy and parturition rates (42.9%) compared to AI after 24 h after CIDR removal 28.6% group. In conclusion, these studies will propose an optimal estrus synchronisation process with subsequent timing of AI and also will promote the Korean black goat breeding industry.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Estrus synchronization and artificial insemination in Korean black goat (Capra hircus coreanae) using frozen-thawed semen

Kim

Lee

Kim³

et al. 2021

J Anim Sci Technol

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“…These reports show that the laparoscopic technique allows to perform different kinds of operation in a short time, especially in small ruminants. The shortening of the time of surgery in consecutive sessions (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) was the result of the increasing skills and better cooperation of surgeons. These observations were also noticed by other authors [28,29].…”

Section: Discussionmentioning

confidence: 99%

“…Endoscopic methods are used in breeding animals for recovering and transferring embryos, for intra-uterine insemination, and for diagnostic purposes, e.g., ovary and uterus evaluation, ovulation observation and development of corpus luteum, and oocyte recovery [1][2][3]. An increasing interest in non-surgical methods of oocyte recovery, as well as recovery and transfer of embryos for research purposes and practical implementation can be seen [4].…”

Section: Introductionmentioning

confidence: 99%

“…This results from the intention to maximize the application of the genetic potential of the animals on the basis of modern biotechnological programs: estrus synchronization, superovulation, oocyte recovery, in vitro maturation and fertilization, cryopreservation, and embryo transfer [5][6][7]. With the varying responses to superovulation [8] and the effectiveness of methods of obtaining and transferring embryos ranging between 22% and 80% [3,5,9], maturation and in vitro fertilization, and the production of embryos, have become an attractive option used in research and in farm animals. In ewes and goats, methods based on the MOET program 2 of 14 (Multiple Ovulation Embryo Transfer) have been introduced [10].…”

Section: Introductionmentioning

confidence: 99%

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L-OPU in Goat and Sheep—Different Variants of the Oocyte Recovery Method

Wieczorek

Koseniuk²,

Skrzyszowska

et al. 2020

Animals

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The laparoscopic method of recovering oocytes in goats and sheep is one of the minimally invasive methods used in the biotechnology of animal reproduction. It allows for good quality oocytes that are suitable for in vitro maturation and fertilization to be recovered. The limitation of using the laparoscopic ovum pick-up (L-OPU) method in goat and sheep is its changing effectiveness and the lack of repeatability of results, as well as the varying effectiveness of different variants of the method. Therefore, it is necessary to develop effective non-invasive techniques allowing for multiple good quality oocyte recovery that would be suitable for in vitro maturation and fertilization. In this study, four different L-OPU variants were described in goats and sheep. Various techniques of recovering oocytes were discussed, including the techniques of conducting the operation, various tools for recovering oocytes, and different plans of hormonal stimulation. Recovery rates were 35% (Variant I), 57% (Variant II), 72% (Variant III), and 67% (Variant IV). After evaluation, 94% (both Variant I and II), 93% (Variant III), and 84% (Variant IV) of the oocytes were qualified for in vitro maturation. The results of the study show that the proposed technique of laparoscopic recovery of oocytes allows a sufficient number of ovarian cells suitable for in vitro culture to be obtained and as a consequence it makes them useful in in vitro maturation/in vitro fertilization (IVM/IVF) programs or cloning. The method allows for a fast and effective conduct of the operation in a living donor with minimal invasiveness while preserving the excellent condition of animals.

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