Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2458525 | Small Ruminant Research | 2006 | 6 Pages |
Abstract
Metabolic experiments were conducted for each Thai native (TN) and Anglo Nubian-TN 50% (ANÂ ÃÂ TN) bucks, 26.5-38Â kg BW and 35-52 months of age, by assigning the following concentrate diets, which had four levels of CP concentrations, T1: 14%, T2: 21%, T3: 28% and T4: 35%, on a DM basis. The animals were fed the concentrates at a rate of 1% of their BW and had ad libitum access to Paspalum plicatulum hay. As the CP level increased, digestibility of CP, N excretion in urine and N retention increased (PÂ <Â 0.01). No significant differences of DM digestibility among the CP levels of diet and between the breeds of bucks were observed. The ANÂ ÃÂ TN had higher DM intake than TN (PÂ <Â 0.05, 40.9Â g/(kg BW0.75Â day) versus 36.0Â g/(kg BW0.75Â day)), thus N intake of ANÂ ÃÂ TN was higher than that of TN (PÂ <Â 0.01, 0.99Â g/(kg BW0.75Â day) versus 0.90Â g/(kg BW0.75Â day)). Digestibility of CP and blood urea N concentrations of TN were higher than those of ANÂ ÃÂ TN (PÂ <Â 0.05, 69.8% versus 64.0% and 32.2Â mg/dl versus 26.7Â mg/dl, respectively). The ANÂ ÃÂ TN tended to retain more N than TN in the higher CP feeding condition of T3 (0.19Â g/(kg BW0.75Â day) versus 0.11Â g/(kg BW0.75Â day)) and T4 (0.25Â g/(kg BW0.75Â day) versus 0.17Â g/(kg BW0.75Â day)). Digestibility of NDF and ADF, and TDN of TN were higher than those of ANÂ ÃÂ TN (PÂ <Â 0.05, 61.1% versus 55.9%, 49.6% versus 43.5% and 65.8% versus 62.4%, respectively). The overall mean DE was 109Â kcal/(kg BW0.75Â day), and no significant difference of DE among CP levels nor breeds of bucks was observed. Thai native was superior to ANÂ ÃÂ TN in digestibility of N and fiber fractions at the maintenance level of DE, which might have overcome inferiority of TN to ANÂ ÃÂ TN in amount of N and energy intake caused by the lower DMI. It is likely that TN goats are well adapted to fodder shortage condition due to their efficient utilization of nutrients.
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Authors
H. Kumagai, W. Ngampongsai,