ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : The Use of Vaginal Electrical Resistance to Diagnose Estrus and Early Pregnancy and Its Relation with Size of the Dominant Follicle in Dairy Cattle)

ผู้เขียน:Million Tadesse, ดร.จำเริญ เที่ยงธรรม, รองศาสตราจารย์, ดร.อนุชัย ภิญโญภูมิมินทร์, รองศาสตราจารย์, ดร.สมเกียรติ ประสานพานิช, รองศาสตราจารย์, Azage Tegegne

สื่อสิ่งพิมพ์:pdf

Abstract

The use of vaginal electrical resistance (VER) for estrous detection and early pregnancy diagnosis were evaluated using three experiments in dairy cattle, in Ethiopia. VER was measured: 1) during the natural estrous (n = 60) cycle, 2) during estrus induced by GnRH+ PGF2? (n = 11) and 3) during post insemination in dairy cows synchronized with GnRH+CIDR+PGF2? (n = 25). Results from Experiment 1 indicated that VER (mean ? SD) during pro-estrus, estrus, metestrus, diestrus and anestrous was 89.6 ? 3.1, 82.2 ? 2.2 102.9 ? 3.1, 106.8 ? 1.4 and 119.7 ? 1.7 ohm, respectively. Results from Experiment 2 indicated that VER was highest (102.4 ? 2.0 ohm; P < 0.001) at the time of PGF2? injection and significantly declined to 82.3 ? 0.7 ohm at the time of estrus and increased (94.9 ? 2.0 ohm; P < 0.001) 24 h after estrus. The mean diameter of the largest follicle (DLF) was highest (14.3 ? 0.1 mm; P < 0.001) at estrus and lowest (10.0 ? 0.1) at the time of PGF2? injection. The VER value was inversely correlated (r = -0.50; P < 0.001) with DLF. Results from Experiment 3 showed that VER significantly (P < 0.01) declined from day 19 to day 21 post insemination in non pregnant cows compared with pregnant cows. The study proved that VER can effectively be used for estrus detection and can be used to diagnose early pregnancy (day 18–21 post insemination) in dairy cows.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 045, Issue 3, May 11 - Jun 11, Page 435 - 443 |  PDF |  Page