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Utilization of steam-treated oil palm fronds in growing goats: 1. Supplementation with dietary urea


Utilization of steam-treated oil palm fronds in growing goats: 1. Supplementation with dietary urea



Asian-Australasian Journal of Animal Sciences 19(9): 1305-1313



ISSN/ISBN: 1011-2367

Five male dairy goats (Saanen), 4.6 month old with a body weight of 21.4 (SD +/- 1.6) kg, were used to examine 5 dietary urea treatments in a 5x5 Latin Square experimental design. The five levels of urea were 10, 20, 30, 40 and 50 g urea/kg DM of steam-treated oil palm fronds (OPF) and dry matter intake tended (p > 0.05) to increase with increasing urea supplementation up to 30 g/kg OPF (77.7 g/kg BW0.75), but decreased (p < 0.05) with 40 and 50 g urea/kg OPF (67.4 and 63.7 g/kg BW0.75,respectively) supplementation. Similarly, dry matter, organic matter, crude protein, neutral detergent fiber and hemicellulose digestibilities increased (p < 0.05) with the addition of urea to 30 g/kg OPF but thereafter decreased (p < 0.05) with 40 and 50 g/kg OPF. Ruminal pH, ruminal NH3-N concentration and plasma urea concentration increased linearly (p < 0.01) and quadratically (p < 0.01) as a consequence of addition of urea to the diet. Excretion of total purine derivatives (PD) by goats fed 30 g of urea/kg OPF was highest (p < 0.05) followed by goats fed 20, 40, 10 and 50 g of urea/kg OPF. Microbial N (g N/day) and efficiency of microbial N supply expressed as g N/kg organic matter apparently digested in the rumen were higher (p < 0.05) in goats fed 30 g of urea/kg OPF (5.5 g N/day and 22.0 g N/kg DOMR, respectively) than in goats on 10 and 50 g of urea/kg OPF treatments. However, the former did not differ from goats fed 20 g of urea/kg OPF (3.9 g N/day and 16.6 g N/kg DMOR, respectively). Ruminal VFA concentration, protein/energy ratio, N absorption and N retention increased (p < 0.05) with the addition of urea to the diet up to 30 g/kg OPF but decreased (p < 0.05) with 40 and 50 g/kg OPF. This implies that the optimal level of urea supplementation in an OPF based diet was about 30 g urea/kg OPF.

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Related references

Utilization of steam-treated oil palm fronds in growing goats: 1. Supplementation with dietary urea. Asian-Australasian Journal of Animal Sciences 19(9): 1305-1313, 2006

Utilization of steam-treated oil palm fronds in growing goats: 1. Supplementation with dietary urea. Asian Australasian Journal of Animal Sciences 19(9): 1305-1313, 2006

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