Improvement of conception rate on Hanwoo; The key hormones and novel estrus detector

Joo, Young Ho and Jeong, Seung Min and Paradhipta, Dimas Hand Vidya and Lee, Hyuk Jun and Lee, Seong Shin and Choi, Jeong Seok and Noh, Hyeon Tak and Chang, Hong Hee and Kim, Eun Joong and Kim, Sam Churl (2021) Improvement of conception rate on Hanwoo; The key hormones and novel estrus detector. Journal of Animal Science and Technology, 63 (6). 1265 – 1274. ISSN 26720191

[thumbnail of Paradhipta_PT.pdf] Text
Paradhipta_PT.pdf - Published Version
Restricted to Registered users only

Download (734kB) | Request a copy

Abstract

Two field experiments were conducted to improve the conception rate of Hanwoo cow. The first experiment aimed to investigate the physiological condition of Hanwoo cows on estrus, including metabolic profiles and body condition score (BCS). The second experiment investigated the effect of a novel estrus detector on the artificial insemination (AI) conception rate for Hanwoo cows. For the first experiment, 80 Hanwoo cows (2.5 ± 0.10 of parity), approximately one month before estrus, were housed in 16 pens and offered the experimental diets twice daily with free water access. The BCS were recorded, and blood was collected from the jugular veins just before AI. The collected blood was used to measure physiological conditions, such as metabolite and hormone levels. For the second experiment, each cow was equipped with a neck-mounted estrus detector collar, which had a sensor connected through the internet. Approximately one month before estrus, three hundred sixty Hanwoo cows (2.4 ± 0.21 of parity) were assigned into groups with or without W-Tag collar treatments. The animals were managed the same as in the first experiment. The pregnancy rate reached 55 in the first experiment. The concentration of luteinizing hormone (LH) was higher (p < 0.012; 1.56 vs. 1.08 ng/mL) in cows that were not pregnant (NPG) than in cows that were pregnant (PG) after AI. The BCS and other concentrations of metabolites and hormones in the blood were not different in both NPG and PG cows. The ranges of estrogen, LH, and follicle-stimulating hormone for PG cows were 11.9 to 39.0 pg/mL, < 0.25 to 1.98 ng/mL, and < 0.50 to 0.82 ng/mL, respectively. In the second experiment, cows with the estrus detector had lower days open (p < 0.001; 78.1 vs. 84.8 d), insemination frequency (p < 0.001; 1.26 vs. 2.52), and return of estrus (p < 0.001; 70.9 vs. 79.1 d) than those in cows without the estrus detector. In conclusion, the present study indicated that lower LH concentration just before AI potentially increased the pregnancy rate of Hanwoo cows. Furthermore, the application of estrus detectors to Hanwoo cows could improve the conception success rate for AI. Copyright © 2021 Korean Society of Animal Sciences and Technology.

Item Type: Article
Additional Information: Cited by: 1; All Open Access, Gold Open Access, Green Open Access
Uncontrolled Keywords: Artificial insemination; Conception rate; Estrus detector; Hanwoo cow; Luteinizing hormone
Subjects: S Agriculture > SF Animal culture
Divisions: Faculty of Animal Sciences > Department of Animal Nutrition and Feed Science
Depositing User: Sri JUNANDI
Date Deposited: 29 Oct 2024 08:23
Last Modified: 29 Oct 2024 08:23
URI: https://ir.lib.ugm.ac.id/id/eprint/5809

Actions (login required)

View Item
View Item