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Effect of Sweet Potato Vine Silage and Urea-Molasses Blocks on Nutrient Intake , Nitrogen Balance and Rumen Microbial Protein Synthesis of Crossbred Heifers on a Poor Quality Diet
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wassie, Shimels Eshete Ali, Asep Indra Munawar Korir, Daniel K. Goopy, John P. Klaus Butterbach-Bahl Merbold, Lutz Schlecht, Eva Dickhoefer, Uta |
| Copyright Year | 2017 |
| Abstract | Supplementation of low-quality roughages with sweet potato vine silage (SPVS) or ureamolasses blocks (UMB) is considered to improve livestock production by enhancing microbial fermentation in the rumen and thereby nutrient and energy supply to the host. A 3×2 Youden square design was used to test the effects of SPVS or UMB supplementation on nutrient intake, nitrogen (N) balance, and ruminal synthesized microbial N during two experimental periods with each 21 d of adaptation and 7 d of total urine and feces collection. Six Holstein Friesian-Boran crossbred heifers with a body weight (BW) of 153 kg (standard deviation [SD] 16.9) were allotted to three groups of two animals each. Animals were fed individually with a basal diet alone or supplemented with SPVS (basal diet + SPVS [2.5% BW, as-fed basis]) or UMB (basal diet + UMB [ad libitum]). The basal diet consisted of 61.4 % wheat straw and 38.6 % Boma Rhodes hay (on dry matter [DM] basis) and was offered at 2 % of BW (as-fed basis). Daily DM intake and digestibility of DM did not differ between diets (P > 0.05). Mean daily DM intake and digestibility of DM were 3.1 kg d-1 (SD 0.6) and 50.3 g/100 g DM (SD 3.1), respectively. Similarly, there were no differences (P > 0.05) in daily N intake (41.4 g d-1 [SD 8.9]) or daily urine N (19.8 g d-1 [SD 4.4]) and fecal N (26.7 g d-1 [SD 5.1]) excretions of heifers fed the three diets. Nitrogen balances were negative for all diets, but higher in heifers consuming SPVS (-2.7 g d-1) compared with those receiving the basal diet alone (-6.2 g d-1; P = 0.02) or supplemented with UMB (-7.2 g d-1; P = 0.01). Urinary purine derivatives excretion and estimated ruminal synthesized microbial N were not affected by diet (P > 0.05). Urinary purine derivatives excretion and estimated duodenal microbial N flow were 42.6 mmol d-1 (SD 11.7) and 22.2 g d-1 (SD 9.4), respectively. The increased N balance in heifers consuming SPVS clearly indicates that supplementation of a low-quality roughage diet with SPVS can improve nutrient utilisation and thus ruminant production in the Tropics. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.tropentag.de/2017/abstracts/links/Wassie_qMF1VCOp.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
