Ovarian function in cows submitted to acute stress during proestrus

Dias Maziero, Rosiara Rosaria [UNESP]; Martins, Aline Carvalho [UNESP]; Mollo, Marcos Rollemberg; Martin, Ian [UNESP]; Bastos, Michele Ricieri [UNESP]; Pinheiro Ferreira, Joao Carlos [UNESP]; Rumpf, Rodolfo; Sartori, Roberto

doi:10.1016/j.livsci.2010.12.003

Ovarian function in cows submitted to acute stress during proestrus

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External sources

http://dx.doi.org/10.1016/j.livsci.2010.12.003

External sources

http://dx.doi.org/10.1016/j.livsci.2010.12.003

Date

2011-06-01

Authors

Dias Maziero, Rosiara Rosaria

Martins, Aline Carvalho

Mollo, Marcos Rollemberg

Martin, Ian

Bastos, Michele Ricieri

Pinheiro Ferreira, Joao Carlos

Rumpf, Rodolfo

Sartori, Roberto

Publisher

Elsevier B.V.

Type

Article

Access right

Acesso restrito

Files

External sources

http://dx.doi.org/10.1016/j.livsci.2010.12.003

External sources

http://dx.doi.org/10.1016/j.livsci.2010.12.003

Abstract

Studies in which ACTH was administrated in heifers after the occurrence of luteolysis showed a delay in the onset of estrus and the estrus duration was shortened. This study evaluated the effect of acute stress by road transportation on estrous behavior and ovulation, monitored by serum progesterone and cortisol concentrations in cows at the periovulatory period, using a crossover design. Eleven crossbred cows, divided into Control and Transport groups had their estrus cycle synchronized with GnRH, an intravaginal progesterone device, and cloprostenol. Thirty hours after withdrawal of the device, the animals of the Transport group were transported for 60 min by truck and those from the Control group remained at pasture. Ovarian ultrasound examination was performed every 12 h from device withdrawal until ovulation in every cow. From the day after removal of the device until ovulation estrous behavior was monitored 24 h a day. Blood samples for serum cortisol and progesterone concentrations were taken at -90, -60, 0, 30, 60 and 180 min in relation to the end of transportation. Transportation during the estrous period induced stress in cows as reflected by changes in serum concentrations of progesterone and cortisol. However, we did not detect impairment in estrus expression, estrus duration or ovulation (P>0.05). (C) 2010 Elsevier B.V. All rights reserved.