Dietary energy and protein intake, plasma progesterone and embryo survival in early pregnancy in the gilt

Abstract

Dietary ener$/ and protein intake, plasma progesterone and -embryo survfval in early pregnancy in the gilt Pharazyn,A.,DenHartog,L. A.,Foxcroft,G ni surla survie embryonnairejusqu'au 28"jour. Toutefois, dans I'ensemble, les teneurs en progest6rone au jour 3 6taient positivemeni rei6es ir la survie des embryons (P < 0,09) et inversement b la variance du taux de survie (P<0,07).

Feeding lactating primiparous sows to establish three divergent metabolic states: I. Associated endocrine changes and postweaning reproductive performance.

“…Independent of treatment, a correlation between embryo survival and plasma progesterone was observed at 72 h after the LH surge in the present study. This observation is consistent with the data reported by Pharazyn et al (1991) and Jindal et al (1996) for cyclic gilts and with data from a recent study with weaned primiparous sows (Zak, Jindal, Aherne, and Foxcroft, unpublished observation).…”

Influence of the number of suckling young and the feed level on foetal survival and growth in rabbit does

“…This reduction in progesterone concentration can be explained by an excretion in the milk (Koldovsky, 1980), a higher metabolic turnover rate (Kirkwood and Aherne, 1985;Pharazyn et al, 1991) or a lower secretion by the corpora lutea due to prolactin (Lin et al, 1987).…”

Efeito do fracionamento da ração diária sobre a concentração sérica de progesterona em porcas gestantes

“…Esse autor observou redução na concentração de progesterona sangüínea de animais que receberam menor número de tratos diários. Em suínos, os efeitos da alimentação sobre a reprodução são mais evidentes em animais com concentração baixa de progesterona (Pharazyn et al, 1991), e manifestam-se mais em marrãs (Ashworth, 1991) do que em matrizes pluríparas (Toplis et al, 1983).…”