2019, Number 2
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Vet Mex 2019; 6 (2)
Pregnancy-associated glycoproteins (PAGs) and progesterone concentrations in Holstein heifers following two methods of estrus syncronization
Akkose M, Cebi SC, Kirmit A, Korkmaz O, Onur YM, Gocen M, Kuru M, Akçay E
Language: English/Spanish
References: 47
Page: 1-11
PDF size: 141.06 Kb.
ABSTRACT
Pregnancy-associated glycoproteins (PAGs) and progesterone concentrations
were assessed in Holstein heifers 28 days post-insemination, following estrus
synchronization with either a double prostaglandin (PG) injection or the
ovsynch protocol. Animals between 15 and 20 months of age, with a 3-3.5
BCS, were randomly assigned to three groups: Heifers in the control group
(n = 70) were monitored for estrus behaviour for 21 days and inseminated
when detected in standing heat; Estrus of heifers in the Ovsynch group
(n = 70)) was synchronized following the Ovsynch protocol, and timed artificial
insemination was performed 16 h after the completion of treatment;
Animals in the PG group (n = 70) received two prostaglandin-F
2α injections
11 days apart, were monitored for estrus behaviour for 2-5 days following the
last injection, and inseminated when in heat. Serum PAGs and progesterone
concentrations were measured in pregnant heifers (control group n = 25;
ovsynch group n = 22; PG group n = 21) on day 28 after artificial insemination
(AI). Mean serum PAGs concentrations (OD: optical density) were
similar between groups (control = 3.37 ± 0.148, Ovsynch = 3.21 ± 0.136,
and PG = 3.34 ± 0.143; p › 0.05). However, serum progesterone concentrations
were found to be lower in the ovsynch group (4.70 ± 0.17 ng/mL)
when compared to the PG (5.34 ± 0.13 ng/mL) or the control (5.37 ± 0.08
ng/mL) groups (p ‹ 0.001). There was no correlation between serum PAGs
and progesterone levels at day 28 post-insemination, or between early pregnancy
PAGs concentrations and fetal death rates. Further research, including
multiple sampling time points throughout gestation, after estrus synchronization
protocols is warranted, to determine if there are associated temporal
changes in PAGs and progesterone profiles that could impact reproductive
parameters in dairy heifers.
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