Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows

被引：1

作者：

Ferre, Luis B. ^{[1
]}

Jaeschke, Julian ^{[2
]}

Gatti, Juliana ^{[2
]}

Baladon, Gerardo ^{[2
]}

Bellocq, Ezequiel ^{[3
]}

Fernandez, Gustavo ^{[4
]}

Rearte, Ramiro ^{[5
]}

Kjelland, Michael E. ^{[6
]}

Colazo, Marcos G. ^{[7
]}

Thomas, Jordan M. ^{[8
]}

机构：

[1] Natl Inst Agr Technol INTA, Chacra Expt Integrada Barrow MDA INTA, RA-B7500 Tres Arroyos, Buenos Aires, Argentina

[2] Dept Tecn Biogenesis Bago SA, RA-B1619 Garin, Buenos Aires, Argentina

[3] Serv Tecn Biogenesis Bago SA, RA-B1619 Garin, Buenos Aires, Argentina

[4] Private Vet Practice, RA-B7501 Indio Rico, Buenos Aires, Argentina

[5] Univ Nacl La Plata, Fac Ciencias Vet, Inst Invest Reprod Anim INIRA, RA-B1900 La Plata, Buenos Aires, Argentina

[6] Mayville State Univ, Mayville, ND 58257 USA

[7] Univ Alberta, Dept Agr Food & Nutr Sci, Edmonton, AB T6G 2P5, Canada

[8] Univ Missouri, Div Anim Sci, Columbia, MO 65211 USA

来源：

ANIMALS | 2023年 / 13卷 / 17期

关键词：

estrus synchronization; intravaginal progesterone device; prostaglandin; presynchronization; cattle; POSTPARTUM BEEF; INTRAVAGINAL PROGESTERONE; CONCEPTION RATES; OVULATORY FOLLICLE; EMBRYO-TRANSFER; BODY CONDITION; ESTRUS; CATTLE; GNRH; AI;

D O I：

10.3390/ani13172803

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Fixed-timed artificial insemination (FTAI) protocols for beef cattle in South America are primarily based on estradiol esters and intravaginal progesterone-releasing devices (IVPD). The objective of this study was to determine the optimal gonadotropin-releasing hormone (GnRH)-based protocol as an alternative to the use of estrogen-based protocols in grazing Bos taurus suckling beef cows. All cows received an IVPD on the day of protocol initiation and prostaglandin F-2 alpha (PG) plus equine chorionic gonadotropin (eCG) treatments at the time of IVPD removal. In Experiment 1, cows (n = 235) were randomly assigned to one of four treatments: (i) 7-day estradiol = 2 mg of estradiol benzoate (EB) at IVPD insertion on Day 9 and 1 mg of estradiol cypionate (ECP) at IVPD removal on Day 2; (ii) 7-day GnRH = 10 mu g of GnRH at IVPD insertion on Day 10, IVPD removal on Day 3 and GnRH at FTAI; (iii) 7 & 7 estradiol = PG at IVPD insertion on Day 16, EB on Day 9 and ECP at IVPD removal on Day 2; (iv) 7 & 7 GnRH = PG at IVPD insertion on Day 17, GnRH on Day 10, IVPD removal on Day 3 and GnRH at FTAI. In Experiment 2, cows (n = 462) were randomly assigned to one of four treatments: (i) 6-day estradiol = EB at IVPD insertion on Day 9, IVPD removal on Day 3 and GnRH at FTAI; (ii) 7-day estradiol; (iii) 7-day GnRH; (iv) 7 & 7 GnRH. In Experiment 1, plasma progesterone concentrations and percentage of cows with a corpus luteum (CL) at IVPD removal, and pregnancy per AI (P/AI) were greater for cows subjected to GnRH-based protocols compared with cows subjected to estrogen-based protocols (p < 0.01). In Experiment 2, cows subjected to the 7 & 7 GnRH protocol had the greatest P/AI (p < 0.01). In summary, GnRH-based FTAI protocols resulted in similar or greater P/AI compared to estrogen-based FTAI protocols in grazing postpartum Bos taurus suckled beef cows. The greatest P/AI was attained with the 7 & 7 GnRH protocol.

引用

页数：15

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