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Early resynchronization protocols for goats: Progestogens can be used prior to an early pregnancy diagnosis without affecting corpus luteum functionality
Author(s) -
Cosentino Isabel Oliveira,
Balaro Mario Felipe Alvarez,
Leal Felipe Seabra Cardoso,
Barbosa Lucas de Figueiredo Cardoso,
Gonçalves Fernanda Martins,
Felizardo Gabriel Feliciano,
Netto Marina Monteiro,
Brandão Felipe Zandonadi
Publication year - 2020
Publication title -
reproduction in domestic animals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.546
H-Index - 66
eISSN - 1439-0531
pISSN - 0936-6768
DOI - 10.1111/rda.13830
Subject(s) - corpus luteum , estrous cycle , pregnancy , luteal phase , medicine , progestin , estrus synchronization , pregnancy rate , andrology , gynecology , biology , ovulation , hormone , genetics
This study aimed to evaluate the exogenous progesterone (P4) effect on the luteal function from Day 16 to Day 21 of the oestrous cycle in inseminated goats with unknown pregnancy status. A total of 54 does passed through a short progestin‐based synchronization protocol and, on Day 16 of the following oestrous cycle, 27 does received a new P4 device which was retained until Day 21. Blood samples were collected daily from all does during this period, as well as on Day 24. Pregnancy diagnoses were performed on Day 30. Serum P4 values from 26 animals (G NPSP : Group of non‐pregnant does with second sponge: n = 8; G NPNSP : Group of non‐pregnant does without second sponge: n = 6; G PSP : Group of pregnant does with second sponge: n = 5; G PNSP : Group of pregnant does without second sponge: n = 7) were determined by radioimmunoassay commercial kits. No P4 differences were found between groups (G NPSP : 3.1 ± 2.8; 1.7 ± 1.8; 0.4 ± 1.0; and 0.0 ± 0.0 vs. G NPNSP : 4.4 ± 1.8; 3.0 ± 2.2; 0.8 ± 0.8; and 0.0 ± 0.0 or G PSP : 4.2 ± 1.0; 3.4 ± 0.6; 3.3 ± 1.6; 3.2 ± 0.9; 3.6 ± 1.2; 3.5 ± 1.3; 2.7 ± 1.3 vs. G PNSP : 4.4 ± 1.6; 3.6 ± 1.5; 3.7 ± 1.5; 3.8 ± 1.4; 3.2 ± 1.2; 3.1 ± 1.2; 3.6 ± 1.1; D16, D17, D18, D19, D20, D21, D24, respectively) or for the interaction of group and time. In conclusion, a second progestogen device had no effect on luteolysis or early pregnancy in the following oestrous cycle.