Timed artificial insemination in crossbred mares: Reproductive efficiency and costs

Autor: Rodrigo Chaves Macan, Natália Santana Siqueira de Lara, Tácia Gomes Bergstein-Galan, Bruna Lampe Zielinski, Luiz Ernandes Kozicki, Romildo Romualdo Weiss, Carlos Eduardo Camargo, Nathália Gonçalves Hesketh Cardoso
Rok vydání: 2021
Předmět:
Male
endocrine system
Pregnancy Rate
media_common.quotation_subject
medicine.medical_treatment
Dinoprost
Chorionic Gonadotropin
Human chorionic gonadotropin
Andrology
03 medical and health sciences
0302 clinical medicine
Endocrinology
Pregnancy
Follicular phase
Animals
Medicine
Horses
Ovulation
Cervix
Insemination
Artificial
Progesterone
reproductive and urinary physiology
media_common
Estrous cycle
030219 obstetrics & reproductive medicine
urogenital system
business.industry
Artificial insemination
Uterus
0402 animal and dairy science
04 agricultural and veterinary sciences
Embryo Transfer
medicine.disease
040201 dairy & animal science
Administration
Intravaginal
Pregnancy rate
medicine.anatomical_structure
Female
Animal Science and Zoology
sense organs
Estrus Synchronization
business
human activities
Biotechnology
Zdroj: Reproduction in Domestic Animals. 56:459-466
ISSN: 1439-0531
0936-6768
Popis: Timed artificial insemination (TAI) has boosted the use of conventional artificial insemination (CAI) by employing hormonal protocols to synchronize oestrus and ovulation. This study aimed to evaluate the efficiency of a hormonal protocol for TAI in mares, based on a combination of progesterone releasing intravaginal device (PRID), prostaglandin (PGF2α ) and human chorionic gonadotropin (hCG); and compare financial costs between CAI and TAI. Twenty-one mares were divided into two groups: CAI group (CAIG; n = 6 mares; 17 oestrous cycles) and TAI group (TAIG; n = 15 mares; 15 oestrous cycles). The CAIG was subjected to CAI, involving follicular dynamics and uterine oedema monitoring with ultrasound examinations (US), and administration of hCG (1,600 IU) when the dominant follicle (DF) diameter's ≥35 mm + uterine oedema + cervix opening. The AI was performed with fresh semen (500 × 106 cells), and embryo was recovered on day 8 (D8) after ovulation. In TAI, mares received 1.9 g PRID on D0. On D10, PRID was removed and 6.71 mg dinoprost tromethamine was administered. Ovulation was induced on D14 (1,600 IU of hCG) regardless of the DF diameter's, and AI was performed with fresh semen (500 × 106 cells). On D30 after AI, pregnancy was confirmed by US. The pregnancy rate was 80.0% in TAIG and 82.3% in CAIG (p > .05). The TAI protocol resulted in 65% reduction in professional transport costs, and 40% reduction in material costs. The TAI was as efficient as CAI, provided reduction in costs and handlings, and is recommended in mares.
Databáze: OpenAIRE
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