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Tytuł:
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Effects of eCG and FSH in timed artificial insemination treatment regimens on estrous expression and pregnancy rates in primiparous and multiparous Bos indicus cows.
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Autorzy:
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Bottino MP; Department of Veterinary Medicine, Federal University of Lavras, Lavras, MG, 37200-900, Brazil.
Simões LMS; Department of Veterinary Medicine, Federal University of Lavras, Lavras, MG, 37200-900, Brazil.
Silva LACL; Department of Veterinary Medicine, Federal University of Lavras, Lavras, MG, 37200-900, Brazil.
Girotto RW; RG Genética Avançada, Água Boa, MT, 78635-000, Brazil.
Scandiuzzi LA Jr; Água Preta Farm, Cocalinho, MT, 78680-000, Brazil.
Massoneto JPM; Água Preta Farm, Cocalinho, MT, 78680-000, Brazil.
Baruselli PS; Department of Animal Reproduction, University of Sao Paulo, Sao Paulo, SP, 05508-270, Brazil.
Souza JC; Department of Animal Science, Federal University of Lavras, Lavras, MG, 37200-900, Brazil.
Sales JNS; Department of Veterinary Medicine, Federal University of Lavras, Lavras, MG, 37200-900, Brazil; Federal University of Juiz de Fora, Juiz de Fora, MG, 36010-041, Brazil. Electronic address: .
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Źródło:
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Animal reproduction science [Anim Reprod Sci] 2021 May; Vol. 228, pp. 106751. Date of Electronic Publication: 2021 Apr 14.
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Typ publikacji:
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Journal Article; Randomized Controlled Trial, Veterinary
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Język:
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English
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Imprint Name(s):
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Original Publication: Amsterdam, Elsevier Scientific Pub. Co.
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MeSH Terms:
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Cattle*
Chorionic Gonadotropin/*pharmacology
Estradiol/*analogs & derivatives
Estrus/*drug effects
Follicle Stimulating Hormone/*pharmacology
Insemination, Artificial/*veterinary
Animals ; Chorionic Gonadotropin/administration & dosage ; Drug Administration Schedule ; Estradiol/administration & dosage ; Estradiol/pharmacology ; Female ; Follicle Stimulating Hormone/administration & dosage ; Insemination, Artificial/methods ; Parity ; Pregnancy ; Pregnancy Rate
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Contributed Indexing:
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Keywords: Equine chorionic gonadotropin; Fixed-time artificial insemination; Follicle-stimulating hormone; Follicular growth; Ovulation synchronization
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Substance Nomenclature:
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0 (Chorionic Gonadotropin)
1S4CJB5ZGN (estradiol 3-benzoate)
4TI98Z838E (Estradiol)
9002-68-0 (Follicle Stimulating Hormone)
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Entry Date(s):
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Date Created: 20210418 Date Completed: 20211103 Latest Revision: 20211103
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Update Code:
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20240104
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DOI:
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10.1016/j.anireprosci.2021.106751
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PMID:
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33866258
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Effects were evaluated in Bos indicus cows of eCG and FSH on follicular growth, estrous expression, and pregnancy per artificial insemination (P/AI) as a result of fixed-time artificial insemination (TAI). In Experiment 1, extent of timing-of-ovulation synchronization among cows was evaluated after imposing an estrogen/progesterone-based treatment regimen. At progesterone device removal (D8), cows were administered: eCG, or FSH or served as untreated Controls. In Experiment 2, percentage of cows P/AI was evaluated when the Experiment 1-treatment regimen was imposed. On D10, all cows were artificially inseminated. In Experiment 3, cows were assigned to two treatment groups (Control and eCG) on D8 to evaluate percentage of cows P/AI and estrous expression. In Experiment 1, follicular dynamics were similar among treatment groups. In Experiment 2, follicular growth was greater (P = 0.0001) with the eCG treatment. There was an interaction of treatment × parity (P = 0.007) on percentage of cows P/AI. There was a greater percentage of primiparous cows P/AI in the eCG-treated than Control and FSH-treated cows. There was a greater percentage of eCG-treated multiparous cows pregnant as a result of TAI than Control cows. There was an interaction of treatment × parity (P = 0.005) on P/AI in Experiment 3, in which the eCG effect was more pronounced in primiparous cows. Treatment with FSH, therefore, was not as effective as eCG in stimulation of follicular growth or enhancing percentage of cows pregnant as a result of TAI. Physiological effects of eCG, however, were also more evident in primiparous cows.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
