EFFECT OF SEQUENCE AND INTERVAL OF FEEDING CONCENTRATE SUPPLEMENT AND ROUGHAGE ON PERFORMANCE OF YANKASA WEANER RAMS
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Department of Agricultural Science
ABSTRACT
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A feeding trial lasting 90 days was conducted using 28 Yankasa weaner rams with an average weight of 14.96 ± 1.10 kg (5-6 months old) to investigate effect of sequence and feeding interval of concentrate supplement (CS) and roughage on performance. The animals were randomly assigned to four treatments (T1: CS fed 1 h prior to feeding grass hay; T2: CS fed 2 h prior to feeding grass hay; T3: grass hay fed 1 h before feeding CS; and T4: grass hay fed 2 h before feeding CS) using a 2x2 factorial arrangement in a randomized complete block design (RCBD). The animals were fed Wooly finger grass (Digitaria smutsii Stent) hay and CS at the rate of 2.4% and 1.6% of body weight, respectively, and offered water ad libitum. Blood collection was done every 4 wk before feeding and 4 h after second feeding. Rumen fluid was collected before feeding and 3 h after second feeding during the last week of feeding trial. Thereafter metabolism trial was conducted with 20 of the rams. Animals in treatment 2 had greater dry matter intake (P < 0.05) than animals in treatment 1, but statistically similar in dry matter intake to those in treatments 3 and 4. The total weight change of treatment 4 animals was significantly (P < 0.05) higher than those of treatment 1 animals, but statistically similar to weight change of treatment 2 and 3 animals. Differences in average daily gain (ADG) among treatments were not significant (P > 0.05). Total volatile fatty acids and pH values of the rumen of the rams 3 h post-feeding were affected (P < 0.05) by the interval of feeding. Blood creatinine levels 4 h post-feeding were only significantly (P < 0.05) affected by interval of feeding grass hay and CS. Apparent digestibility of dry matter (DM) and organic matter (OM) was higher in treatment 4 animals, although no significant (P > 0.05) differences among treatments. Nitrogen intake and retention were not significantly (P > 0.05) different among treatments. It is concluded that, even though, feed intake and growth rate of Yankasa rams were not markedly affected by the sequence (of feeding) as much as interval of feeding CS and grass hay, the rams in treatment 4 had better feed efficiency and nutrient digestibility for better feed utilization and improved performance. Yankasa rams can be fed grass hay 2 h before feeding concentrate supplement.
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