Serum Metabolites of Pregnant and Hysterectomized Gilts Fed Two Levels of Energy

Body Weight Loss during Lactation in Relation to Energy and Protein Metabolism in Standard‐Fed Primiparous Sows

“…We earlier observed a significant decrease in insulin between day 10 and day 20 of lactation in primiparous sows (ROJKITTIKHUN et al, 1992 a). A decrease in blood glucose during a 2-week lactation in primiparous sows has also been previously reported (RUIZ et al, 1971).…”

“…The increase in concentrations of NEFA from day 2 to day 7 in our study is contrary to the findings of earlier studies in which a decrease was observed during the first week of lactation in primiparous sows (RUIZ et a]., 1971) and in low-backfat multiparous sows (HULTBN et a]., 1992). This lowering of NEFA was ascribed to the increased utilization of this compound for the synthesis of triglycerides and cholesterol esters by the liver since they observed corresponding increases in triglycerides and total cholesterol during that period (RUIZ et al, 1971). In our study no significant changes in concentrations of triglycerides and cholesterol were found during the first week.…”

Effect of feed intake level in late gestation on arterial blood concentrations of energy substrates, insulin and glucagon in the chronically catheterized gilt

“…As compared with nonpregnant animals fed under the same conditions, pregnant gilts exhibit a similar and constant blood glucose concentration. This result is in good agreement with previous observation (Anderson and Dunseth, 1978) but conflicts with data obtained in acute conditions (Ruiz, Ewan and Speer, 1971 ;Atinmo, Pond and Barnes, 1974). This feature supposes the maintenance of glucose homeostasis in the pregnant gilt which is primordial as glucose represents the main energetic substrate for the foetus (Battaglia and Meschia, 1978).…”

“…The present study fails to show a marked rise of free fatty acid level in late gestation as previously noticed in acute conditions of blood sampling (Ruiz, Ewan and Speer, 1971 ;Atinmo, Pond and Barnes, 1974). This metabolic situation agrees with data obtained on guinea-pig (Sparks et al, 1981) or rabbit (Gilbert et a/., 1984) but differs with observations made on rat (Gilbert and or in human pregnancy (Kalkhoff, Kissebah and Kim, 1978).…”

“…Until now, such a study was partially performed in acute conditions from venous blood sampling (Ruiz, Ewan and Speer, 1971 ;Atinmo, Pond and Barnes, 1974 (Pégorier et al, 1983). Stable concentrations of blood metabolites are found after the first postoperative day but later concerning plasma insulin.…”