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High temperature impairs rabbit viability, feed consumption, growth and fecundity: examination of endocrine
A V Sirotkin1, V Parkanyi2, J Pivko2
1Constantine the Philosopher University, 949 74 Nitra, Slovakia; Research Institute for Animal Production, National Agricultural and Food Centre, 11 Nitra, 951 41 Lužianky, Slovakia.
Abstract:
The aim of the present study was to examine the effect of high ambient temperature on rabbit feed consumption, growth, viability, and fecundity, as well as the morphology and endocrine function of gonadal and adrenal cells. Adult does and their offspring were kept at either a comfortable (20°C; control) or high (36°C) temperature throughout pregnancy and up until weaning of pups. Doe mortality and fecundity, and plasma concentrations of hormones were evaluated. In addition, granulosa cells were cultured with and without FSH to assess progesterone production. In the offspring, we assessed mortality, total feed consumption, feed efficiency, growth, plasma hormone concentrations, as well as the microstructure in ovarian granulosa cells, testicular Leydig cells, and adrenocortical cells. We observed greater mortality of both adult animals and offspring at the higher ambient temperature compared with the control. The higher ambient temperature suppressed feed consumption, feed efficiency, and growth of pups. Adult and young females exposed to a high temperature had lower circulating concentrations of progesterone, but not of estradiol, compared with controls. Young males exposed to a high ambient temperature had greater circulating concentrations of testosterone, but not progesterone, compared with controls. High ambient temperature reduced circulating IGF-I concentrations in all the animals. Corticosterone level was increased in plasma of young but not of adult animals. Granulosa cells isolated from the ovaries of does subjected to high temperatures released less progesterone, and they had poorer response to the stimulatory action of FSH than the cells from control does. High temperatures induced fragmentation of nucleoli in ovarian granulosa cells, but they did not alter the state of other organelles in ovarian, testicular, or adrenocortical cells. A negative influence of high temperature on rabbit feed consumption, growth, viability, and fecundity was observed. Taken together, these changes could be due to a decrease in IGF-I and/or progesterone secretion, destruction of ovarian cell nucleoli, and/or impaired ovarian cell response to FSH.
