The objective of the study was to establish baseline information on body weight, growth rate and body development of Frieswal crossbred bulls and to find out various non-genetic factors effect on growth pattern. The mean body weight of bull calves aged 3, 6 and 12 months were 83.45±4.79, 122.36±2.61 and 206.91±4.56 kg, respectively. At 18 months (age of induction for semen collection) young bulls attained 57% of mature body weight (550 kg). The body weight showed continuous enhancement up to 6.5 years, thereafter declined at 7 years of age, indicating onset of senility between 6.5 to 7 years. Age and season significantly affected average daily body weight gain (ADG in g/d) and average daily increase in body surface area (BSA in cm2/d). In young bulls ADG and daily enhancement in BSA were significantly (P<0.01) higher compared to adult bulls. Body weight and BSA increased with age advancement, however, ratio of BSA to unit body weight (BSA/Kg) gradually decreased. Seasons significantly (P<0.05) influenced growth patterns of young bulls, being significantly higher during winter, followed by summer and rainy seasons. Trends of seasonal influence on ADG and enhancement in BSA in mature bulls (37–92 months) were also similar to that of young bulls. Season of birth of bull calves showed no significant impact on growth rate of young bulls. Age of bull showed significant (P<0.01) positive relationship with body weight and BSA, however, negative relationship with BSA/kg of body weight.
Body weight and surface area, Frieswal, Growth
