Evaluation of crude glycerin as a partial substitute of corn grain in growing diets for lambs

Glycerol-based formulations increases ovulation rate in sheep similarly to eCG but red blood cell indices may be affected

“…To identify the formulations and doses capable to induce a positive change in ewe's metabolic status we assessed their effects against those induced by M100. The latter dose has been indeed already evaluated for its effects on sheep metabolism and reproductive performance (8,16,18). Obtained results shows that the high and moderate dose groups (G100, M75 and G75) showed no differences in mean glycerol plasma concentrations compared to the M100 one ( Figure 2, panel a).…”

“…To verify whether the tested formulations were able to create a metabolic milieu suitable for the final follicular growth and thus for the conception period in the ewe, as described in previous studies (20), we compared the circulating concentrations of glycerol, glucose, insulin, urea and NEFA against those found in the M100 dose. This dose was taken from previous studies, being already evaluated for its effects on sheep metabolism and reproductive performance (8,16,18). In the low dose groups, showing no alterations in plasma osmolality and RBC indices, the metabolic milieu was markedly different compared to that found in M100 (lower glycerol, glucose and insulin circulating concentrations, higher NEFA and urea circulating concentrations).…”

“…Thus, the objective of this study was to investigate the metabolic and osmotic effects of different doses of glycerol and glycerol-propylene glycol mixtures in Sarda sheep in order to identify those able to positively modify ewe's metabolic status without significantly affecting RBC indices. The highest dose of the glucogenic mixture was taken from previous studies, being already evaluated for its effects on sheep metabolism and reproductive performance (8,16,18). Thereafter, to determine the ability of the selected glucogenic doses to promote ovarian function, we evaluated their effects on ewe's ovarian activity during an induced follicular phase, comparing them to the effects of the administration of a synthetic gonadotropin (eCG).…”

Administration of Glycerol-Based Formulations in Sheep Results in Similar Ovulation Rate to eCG but Red Blood Cell Indices May Be Affected

“…This dose was taken from previous studies, being already evaluated for its effects on sheep metabolism and reproductive performance (8,16,18). In the low dose groups, showing no alterations in plasma osmolality and RBC indices, the metabolic milieu was markedly different compared to that found in M100 (lower glycerol, glucose and insulin circulating concentrations, higher NEFA and urea circulating concentrations).…”

“…Thus, the objective of this study was to investigate the metabolic and osmotic effects of different doses of glycerol and glycerolpropylene glycol mixtures in Sarda sheep in order to identify those able to positively modify ewe's metabolic status without signi cantly affecting RBC indices. The highest dose of the glucogenic mixture was taken from previous studies, being already evaluated for its effects on sheep metabolism and reproductive performance (8,16,18). Thereafter, to determine the ability of the selected glucogenic doses to promote ovarian function, we evaluated their effects on ewe's ovarian activity during an induced follicular phase, comparing them to the effects of the administration of a synthetic gonadotropin (eCG).…”