INFLUENCE OF TECHNOLOGICAL FEEDING REGIME IN NEWBORN CALVES ON SOME HEMATOLOGICAL PARAMETERS II. SUMMER SEASON

К. Krastev, S. Grigorova

Резюме: The aim of this study was to investigate the influence of two feeding and breeding regimes in summer born calves dur¬ing the first thirty days of neonatal development on some hematological parameters: total protein, hemoglobin, hematocrit, erythrocyte count, total protein, cortisol and pH. An experiment was conducted with16 newborn calves from Bulgarian Black- and White population divided into two groups, 8 calves in each. The calves from the I group received colostrum from their mothers for a period of 5 days, while calves from the II group were separated from their mothers immediately after birth and received mixed milk.. After separation from their mothers the calves from both groups were raised in individual cages in the open. It was found that:
The raising of calves in individual cells of an open space during the summer combined with five-day stay with their mothers during the colostral period reflects favorably on the adaptive capacity and physiological condition. Higher values of total protein, hemoglobin, hematocrit and erythrocyte count were established with the age accompanied by decreased level of plasma cortisol.
Calves separation from their mothers immediately after birth and feeding with mixed milk instead of colostrum was ac¬companied by increased of biosynthesis and secretion of cortisol during the first 24 hours after birth and less pronounced positive changes in the values of total protein, hemoglobin, hematocrit and erythrocyte count of blood.
PH values were no significantly influenced throughout the study.

Ключови думи: feeding regime; hematological parameter; newborn calves; summer season

Дата на публикуване: 2017-05-09