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http://dx.doi.org/10.5187/JAST.2006.48.6.871

Effect of Ad libitum and Restricted Milk Feeding on Growth Performance of Holstein Calves  

Khan, M. A. (National Livestock Research Institute, R.D.A)
Publication Information
Journal of Animal Science and Technology / v.48, no.6, 2006 , pp. 871-880 More about this Journal
Abstract
This study was conducted to estimate the maximum amount and time of milk consumption by Holstein calves during two months of pre- weaning period and to compare ad libitum milk feeding with conventional system for their effects on dry feed consumption, nutrient intake, growth performance and occurrence of diarrhea during the pre-weaning phase. Holstein calves (n=20) were alternatively fed colostrum at 10% of their body weight or ad libitum for the first three days (d) and then assigned either to conventional (n=10; calves were fed milk at 10% of their body weight from birth to weaning at d 60 of their age) or ad libitum milk feeding (n=10; calves were fed ad libitum milk from birth to weaning at d 60 of their age). Milk intake as a percent of body weight was increased in ad libitum fed calves from 13.59% at d 1 to 23.50% at d 30 of their age, thereafter it was gradually reduced. Ad libitum fed calves consumed daily 9.8kg milk compared with 4.3kg milk in restricted fed calves(p<0.05). Daily starter and mixed grass hay intake was gradually increased in both groups with the age however; the group differences were noted non-significant up to 40 d of age. Overall from birth to weaning conventionally fed calves ate 18.4, 20 and 18.9% more dry matter, crude protein and total digestible nutrients, respectively than ad libitum milk fed calves (p<0.05). Weight gain was 49, 18.4 and 26% higher in ad libitum milk fed calves than conventionally fed calves during the first month, the second month and from birth to weaning, respectively(p<0.05). Body weight was not significantly different between groups for the first 20 d of age. However, it was significantly higher for ad libitum milk fed calves at d 30, 40, 50, 60 (weaning) and 90 (post weaning) of their age(p<0.05). Similar body weights for both conventionally and ad libitum milk fed calves were observed for the post weaning period at 120, 150 and 180 d of age. Feed efficiency was significantly higher for conventionally fed calves than ad libitum milk fed calves(p<0.05). No sign of diarrhea, fever or cough was observed in calves fed either conventionally or ad libitum milk during the experimental period. In conclusion, calves fed more milk remained healthy and gained higher weight before weaning and maintained this advantage at least up to 90 d of their age.
Keywords
Holstein calf; Weaning; Colostrum; Milk feeding;
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