The objective of this study was to evaluate the milk yield, milk composition and blood biochemical components as well as body weight and daily gain of newborn calves produced from local and their crossing bovine cows under desert of Inshas area at Egypt. Twenty one pregnant cows in first parity chosen according to the nearest calving day were used in the experiment. Experiment was carried out during last stage of pregnancy (four weeks before birthing) and continued to calving and 8 weeks postpartum. Experimental pregnant cows including three equal groups, each group was 7 cows. 1st group was Local bovine cows (L) while 2nd group was F1 crossbred (H) cows; (50%, Local cows x Holstein bull) and 3rd group was F1 crossbred (BS) cows; 50% (Local cows x Brown Swiss bull). Results showed that H cows have a highest daily milk yield and daily milk components while L cows have lowest values. Milk energy during 1st week post-partum was higher than milk energy during 4th or 8th week post-partum. Fat corrected milk yield was significantly positive correlated with milk components and was significantly negative correlated with milk energy.
Crossing cows have significantly higher total protein and albumin concentrations than L cows. Total protein, globulin and γ-globulin concentrations at parturition were significantly higher than its concentrations at late gestation period and during 8th week from lactation period. Glucose, total lipids, total cholesterol and triglycerides concentrations were not differs significantly between local cows and their crossing. Glucose and total cholesterol concentrations showed significant increase at late gestation period as well as at parturition compared with its concentrations at 8th week of lactation period. Crossing cows have significantly higher urea concentration and T4, T3 and Estradiol17β levels than its levels in L cows. Body weight of newborn both male and female calves as well as daily body weight gain of calves produced from crossing cows were higher significantly than newborn calves produced from L cows with priority to calves produced from H cows. In addition, male calves at birthing, after 4th and 8th weeks from birthing were heavier in weight and faster in growth than female ones in the three genotype breeds.
Habeeb AAM, El-Masry KA, Gad AE and Basuony HA