Efficacy of CIDR treatment against ovarian follicular cysts in cows
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Date
2004
Journal Title
Journal ISSN
Volume Title
Publisher
Kagoshima University
Abstract
The objectives of this study were to identify cows with follicular cysts and study the efficacy of CIDR (Progesterone=1.9g) treatment against ovarian follicular cysts in Japanese Black and Hoistein cows. Forty-one cows from Kagoshima Prefecture and Miyazaki Prefecture were initially identified by rectal palpation to have follicular cysts. These were randomly allocated into three groups where group 1 (n=29) were treated with CIDR for 7 days, group 2 (n=11) treated with CIDR for 14 days, and group 3 (n=1) as the control group where no CIDR was inserted. After removal of CIDR, all animals received an intramuscular injection of 25 mg PGF_<2α>. Fifteen out of 41 cows were confirmed to have follicular cysts after plasma progesterone determination by radioimmunoassay, as they had a pre-treatment progesterone concentration of<1ng/ml. Four Holstein cows were treated with 7 days of insertion. The plasma progesterone concentration increased significantly (P<0.01) after CIDR treatment i. e. day 0 (0.32±0.22ng/ml) to day 21 (3.96±1.99ng/ml). Eight Japanese Black cows with a pre-treatment mean plasma progesterone concentration of 0.32±0.26ng/ml were treated with CIDR for 7 days where 7 of them (87.5%) had an increased post-treatment progesterone concentration of 3.66±1.54ng/ml (P<0.01). Three Japanese Black cows treated with 14 days of CIDR insertion had pre-treatment and post-treatment progesterone concentrations of 0.35±0.14ng/ml and 2.40±1.86ng/ml, respectively (P=0.09). Fourteen out of fifteen ovarian follicular cyst cases had increased progesterone levels 14 days after CIDR removal (post-treatment period), 11 cows (73.3%) came to estrus 2-6 days after removal of the CIDR device and ovulation of a dominant follicle occurred with following formation of the corpus luteum. The overall success rate of CIDR treatment against ovarian follicular cysts (increase in plasma progesterone concentration>1ng/ml) was 93.3% in both treated groups.
Description
Mem.Fac.Agr. Kagoshima, 2004; 39:45-56
Keywords
CIDR, Cow, Follicular cyst, Progesterone, Ultrasonography