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Year : 2019
Tome : 170
Volume : 4-6
Pages : 110-116
Title : The impacts of eCG administration, 3 days before OVSYNCH on the treatment of inactive ovary of dairy cows
Authors : M. MOHAMMADSADEGH
Summary : Anestrus due to inactive ovaries decreases the probability of breeding and pregnancy rates, and increases days open in dairy cows. The objective of this study was to study the effect of equine chorionic gonadotrophin (eCG) administered three days before ovum synchronization (OVSYNCH) protocol in anestrous dairy cows. Therefore, one hundred sixty nonpregnant cows were included in the research as a clinical trial study with days in milk 60±5 days, (BCS 3±0.25, milk yield 46±8 kg, parity 3±1, during the last September to April) with no signs of estrus and suffering from inactive ovary. Transrectal palpations of ovaries were conducted at the time of animal selection, and were repeated 10 days later with an ultrasound probe. The anestrous cows without ovarian corpus luteum (CL), persisted follicle or persisted CL, ovarian cysts and large follicles (>10 mm) on that two examinations were assigned to the study. Selected cows were treated with OVSYNVH (n=40), controlled intra-vaginal device releasing (CIDR) +OVSYNCH (n = 40), eCG + OVCSYNCH (n = 40) or placebo (n=40). Pregnancy examination was carried out on day 33± 3 after the insemination with a transrectal ultrasound probe, and non-pregnant animals were treated repeatedly with the same protocol in their groups. Results showed that the rate of large follicles (>15mm) at AI was significantly more (P<0.05), and the treatment to conception interval was lesser in eCG treated animals (P<0.05). It was concluded that the injection of eCG three days before OVSYNCH protocol decreased treatment to conception intervals and increased proportions of cows with a large follicle at AI in anestrous dairy cows.
Keywords : Anestrus, CIDR-OVSYNCH, Dairy cow, eCG, Inactive Ovary
Correspondence : M. MOHAMMADSADEGH
Adress : Department of Clinical Sciences, Faculty of Veterinary Medicine, Garmsar Branch, Islamic Azad University, Garmsar, Iran. Corresponding author: Dr.msadeg@gmail.com
Link : pdf

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