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English :
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Prediction of the nutritive values of some feed mixtures from some rumen degradation parameters in sheep
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Arabic :
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استنباط القيم الغذائية لبعض مخاليط الاعلاف بمعلومية القياسات الدالة على التكسير في كرش الاغنام
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| Abstract |
The present study was conducted to predict the feeding values of some feed mixtures containing pour quality roughages through the determination of some degradation characteristics of DM and fiber fractions in the rumen. Three commonly used poor quality roughages were used, being rice straw (RS), maize stalks (MS) and clover straw (CS) were used along with concentrate feed mixture (CFM) and N sources ( soybean meal SBM and /or urea at the ratio of 7.5% SBM + 0.5% urea (U) or 5.0% SBM+ 1.0% U) to formulate iso-nitrogenous experimental feed mixtures. Moreover, the effect of enzyme mixtures was tested hen added to a mixture containing CS.
Three ruminally cannulated sheep (45kg body weight) were fed the experimental rations at 90% of their ad lib. Intake. The in situ DM and fiber fractions disappearance values were determine at 8,16,24,36,48 and 72 hrs of incubation during the metabolism trials to evaluate the actual feeding values of the experimental rations.
The main results were as follows:
The in situ Dm disappearance values showed that there were no significant effect on the rate of digestion (%/ hr) for RS when supplemented with CFM or when SBM or U were added separately or in combinations at different ratios. The rate of DM digestion ranged from 1.24 to 1.42%/hr. On the other hand, the rate of DM digestion of MS increased (P<0.05) when 5% SBM+1%U or 2.5%SBM+1.5U were added (2.33 and 2.32%/hr, respectively) than the other supplements. There were no significant effect on the rate of DM digestion of CS with any supplement. The rate of DM digestion ranged between 2.03 and 2.19% /hr.
There were no significant effect on the effective degradability (ED) of DM of RS, while the ED of the DM of MS increased (P<0.05) when 5% SBM+1%U or 2.5% SBM+ 1.5%U were added than the other supplements . The ED of DM of CS increased (P<0.05) when CFM or U or kemzyme were added.
The ED values of NDF of RS were significantly (P<0.05) increased when SBM+U was added at any ratio, but for MS, the ED of NDF values were increased (P<0.05) when 5% SBM+1% U or 2.5% SBM+1.5%U were added. The kemzyme. Also increased (P<0.05) the ED of NDF of CS. The ED values of ADF or RS, MS and CS were related to the ED of DM. The effective NDF (eNDF) of MS (14.30%) decreased (P<0.05) when it was supplemented with 5% SBM+1%U than the other treatments. The optimal eNDF for RS, MS and CS rations were 21.87, 22.82 and 24.86, respectively, which led to optimal relative feeding values (RFV) of the rations (110.20, 112.57 and 109.90, respectively).
The TDN values were correlated (P<0.01) with RFV values (r = 0.64, 0.67 and 0.92, for RS, MS and CS rations, respectively). The corresponding values of TDN were 61.35, 70.60 and 60.22%.
In conclusion, this study indicated that determination of fiber fractions of poor quality roughages and their degradation characteristics (a, b and c values) in the rumen by the in situ technique would enable the prediction of the feeding values of feed mixtures. The in situ technique is much simpler and less expensive than the traditional in vivo metabolism trials and would also enable to assess the effect of different treatment specially when they are numerous, as the case in the present study which indicated that when feeding on feed mixtures containing poor quality roughages, supplementation with different N sources resulted in optimizing fermentation of fibers in the rumen.
Keywords: sheep, rice straw, maize stalks, clover straw, in sacco evaluation , effective degradation, relative feeding value,TDN.
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| Publication year |
2003
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| Pages |
1117-1130
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| serial title |
Egyptian Journal Nutrition and Feed
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| Author(s) from ARC |
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| External authors (outside ARC) |
احمد زكى محرز
جامعة المنصورة
ايمان حنفى محمود مقلد
جامعة المنصورة
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Nutritive value.
Rice straw.
Rumen.
Sheep.
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| Proposed Agrovoc |
feed mixture;TDN;clover straw;in sacco evaluation;effective degradation;relative feeding value;maize stalks;
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| Publication Type |
Journal
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