Growth Performance, End Products from Rumen Fermentation and Production Cost of Crossbred Sheep Fed Ensiled Whole Crop Rice as a Roughage Source
Keywords:
whole rice crop silage, sheep, growth performance, rumen fermentation, blood metabolitesAbstract
The objective of this study was to examine the effects of using whole crop rice silage (three-line breeds) as a roughage source in total mixed ration (TMR) on growth performance, rumen fermentation products, and blood metabolites in female crossbreed Santa Ines sheep. Twenty sheep (7 months of age) with 18.33±2.16 kg of initial body weight was allocated into Completely Randomized Design for 4 groups (5 heads each) to receive a TMR containing (50% of concentrate and 50% of roughage) a different roughage as follows: 1) whole crop rice of RD61 silage (RD61) 2) whole crop rice of Suphanburi 1 silage (SB1), 3) whole crop rice of Pathum Thani 1 silage (PT1), and 4) Napier grass silage (NS). Sheep were fed the dietary treatments for 122 days. The results showed that final body weight, body weight gain, average daily gain, and feed conversion ratio of sheep fed TMR containing a different roughage source were not significantly different (P > 0.05). Total dry matter intake and blood urea nitrogen of sheep fed SB1 tended to be higher than the other groups (P = 0.10). Ruminal pH of sheep fed PT1 was higher than RD61, SB1 and NS (P < 0.05). Moreover, RD61 showed the highest concentration of total short-chain fatty acids (P < 0.05). However, acetate, propionate, and butyrate proportions (mol/100mol) were not different among the groups (P > 0.05). Feed cost per gain of sheep fed SB1 was the lowest. Therefore, the results can be concluded that the whole crop rice silage of RD61 and SB1 (harvested at milk stage of paddy rice) have good potential as a roughage source in ruminants
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