תפריט נגישות
ניגודיות עדינהניגודיות גבוהה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם תפריט נגישותניגודיות עדינהניגודיות גבוההמונוכרוםהדגשת קישוריםחסימת אנימציהפונט קריאסגוראיפוס הגדרות נגישותלהורדת מודול נגישות חינםA study was conducted with laying hens to evaluate the effects of cholecalciferol (CC), 25-hydroxycholecalciferol (25-OH-CC) and 1α-hydroxycholecalciferol (1α-OH-CC) on calcium absorption, intestinal and uterine calcium-binding protein (CaBP), and egg shell quality. Calcium absorption was significantly higher in 1α-OH-CC-fed hens during periods of egg shell formation when compared with CC- or 25-OH-CC-fed hens. During periods of uterine inactivity there were no significant differences in calcium absorption between the groups. Intestinal CaBP was significantly higher in 1α-OH-CC fed hens as well. Uterine CaBP was not affected by vitamin D source.
Feed consumption was lower in the 1α-OH-CC than in the CC- or 25-OH-CC-fed hens. The 1α-OH-CC-fed hens had significantly lowered egg weights and daily egg mass. Shell weight and shell density were not affected by vitamin D source. 25-OH-CC did not affect any of the parameters measured.
The results show that neither 25-OH-CC nor 1α-OH-CC affects uterine calcium transport when used at physiological levels, although the latter stimulates calcium absorption considerably.
A study was conducted with laying hens to evaluate the effects of cholecalciferol (CC), 25-hydroxycholecalciferol (25-OH-CC) and 1α-hydroxycholecalciferol (1α-OH-CC) on calcium absorption, intestinal and uterine calcium-binding protein (CaBP), and egg shell quality. Calcium absorption was significantly higher in 1α-OH-CC-fed hens during periods of egg shell formation when compared with CC- or 25-OH-CC-fed hens. During periods of uterine inactivity there were no significant differences in calcium absorption between the groups. Intestinal CaBP was significantly higher in 1α-OH-CC fed hens as well. Uterine CaBP was not affected by vitamin D source.
Feed consumption was lower in the 1α-OH-CC than in the CC- or 25-OH-CC-fed hens. The 1α-OH-CC-fed hens had significantly lowered egg weights and daily egg mass. Shell weight and shell density were not affected by vitamin D source. 25-OH-CC did not affect any of the parameters measured.
The results show that neither 25-OH-CC nor 1α-OH-CC affects uterine calcium transport when used at physiological levels, although the latter stimulates calcium absorption considerably.
