Utilization of corn and cob meal as ruminant feed
1993
Rapeepong Panivivat
First trial was conducted to determine nutrient digestibility and nitrogen balance (N - balance) of corn and cob meal (CCM) in sheep by different method, using 4 % urea treated rice straw (UTS) as a basal diet. Twelve sheeps of average initial weight 34.8 +- 5.5 kg were allocated to 2 treatments (T). They were fed ad libitum with UTS (T1) or with UTS plus CCM at 1.5 % LW (T2). The CCM supplement increased DMI and digestibility of most nutrients as well as N - balance. However, the digestibility of NDF and ADF was found to decrease. The digestibility of DM and CP in CCM, evaluated by difference, was 66.1 and 62.6 %, While that of NDF and ADF was 53.5 and 59.6 %. TDN of CCM was found to be 71.5 %. The second trial, on - farm, feeding trial, was conducted to evaluate the potential use of CCM as a major ingredient in concentrate feed for ruminants as compared to ground corn grain. Fourteen purebred American Brahman bulls, age 8-9 months with initial weight 226.3 +- 22.7 kg were randomly divided to 2 groups. They were kept in individual stalls, fed ad libitum with fresh ruzi grass and supplemented with concentrate feed (18.5 % CP) consisting of either 55 % ground corn or CCM at 1.5 % LW. Afer 112 days no significant difference was found between both groups on DMI, ADG or FCR. However, the concentrate feed cost/kg LW gain of animals in group 2 fed with CCM was lower than group l.
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