Estrogens improve the pregnancy rate in cattle: A review and meta-analysis.

Autor: Taghizadeh E; Department of Clinical Science, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran., Barati F; Department of Clinical Science, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran. Electronic address: fabrtir@yahoo.com., Fallah AA; Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, Shahrekord University, 8818634141, Shahrekord, Iran., Hemmatzadeh-Dastgerdi M; Department of Clinical Science, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran., Nejabati MS; Department of Clinical Science, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran.
Jazyk: angličtina
Zdroj: Theriogenology [Theriogenology] 2024 May; Vol. 220, pp. 35-42. Date of Electronic Publication: 2024 Mar 07.
DOI: 10.1016/j.theriogenology.2024.03.005
Abstrakt: Estrogens have proven to be effective in bovine estrus induction protocols. Considering the extensive use of these products in large-scale estrus synchronization, the primary objective of the present study was to assess their effects on pregnancy rate (PR) using a meta-analysis approach. A total of 797 papers were screened from three major databases (PubMed, Web of Science, Scopus). Sixty-one studies were eligible for inclusion in the meta-analysis. The pregnancy status (success or failure) at 30 days post-insemination was considered as the effect size data. The odds ratios (OR) of PR were evaluated by considering the effects of estrogens in groups with or without estrogen intervention. The impact of estrogen (including factors such as type, dose, and time of administration) and animal characteristics (such as breed, type, and parity) was taken into account when assessing the effectiveness of estrogen response as PR. The results showed an OR of 1.25 (95% CI: 1.15-1.36; P = 0.000) for PR in animals that received estrogen compared to cattle that did not receive estrogen. Estradiol benzoate (OR = 1.3) and estradiol cypionate (OR = 1.2), with doses ranging from 1 to 3 mg (OR = 1.13-1.7), significantly increased the OR of PR. In terms of PR, beef cattle exhibited a higher odds ratio (OR = 1.4; P = 0.000) compared to dairy cattle (OR = 1.1; P = 0.09). The administration of estrogens in the estrus synchronization protocol significantly improved PR in both artificial insemination (OR = 1.2; P = 0.000) and embryo transfer (OR = 1.3; P = 0.033) programs. In summary, incorporating estrogens into estrus induction protocols led to an enhancement of the OR of PR among cattle.
Competing Interests: Declaration of competing interest All authors declare that they have no conflict of interest.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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