Estrus synchronization and artificial insemination in Korean black goat (
Capra hircus coreanae) using
frozen-thawed semen.
JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2021;
63:36-45. [PMID:
33987582 PMCID:
PMC7882844 DOI:
10.5187/jast.2021.e10]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/26/2020] [Accepted: 11/02/2020] [Indexed: 11/29/2022]
Abstract
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°C) 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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