| Titles |
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English :
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Effect of using different sourses of dietary energy for making Berseem silage on performance of lactating cows
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Arabic :
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تأثير استخدام مصادر مختلفة من الطاقة عند عمل سيلاج البرسيم على اداء الابقار الحلابة
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| Abstract |
Eighteen crossbreed Friesian cows in the 2nd_3rd season of lactation and weighing an average of 450 Kg in their early lactation stage were assigned to three balanced groups according to body weight and milk yield (six animals each). The first group was received a diet containing concentrate feed mixture (CFM) + silage with molasses + rice straw, 2rtd group received a diet containing CFM + silage with yellow corn + rice straw and the 3r group ,received a diet containing CFM + silage with chips of sweet potato + rice straw. The diets were formulated to be iso-caloric and iso- nitrogenous according to NRC (1988).
The tests of silages indicate that, pH values, TvFA's, lactic acid and NH3-N concentrations were in normal values and could be classified as good quality silage. Intake of CFM, RS,silages and total dry matter k g/h/d of cows was nearly similar among tested groups. The highest (P<0.05) digestibility values of all nutrients were shown when feed BS- Y and BS.P, while the values of ration containing BS-M appeared to be the lowest. Similar trend was noticed for the NDF. hemicellulose and TDN values of experimental rations. However, no significant difference was detected among different experimental rations for ADF and ADL digestibility.
No significant effects on ruminal pH values among different experimental rations were observed. Concentrations of TVFA's were significantly differed with feeding BS-P and BS- Y compared with feeding BS-M. The overall mean values of acetic, propionic, butyric, Iso-butyric and valeric acid were not affected significantly when feeding different types of berseem silage. Oh the other hand, proportions of iso- valeric acid increased with feeding BS- Y and BS-P compared with feeding BS-M. The overall mean of total nitrogen (TN) was significantly higher (P<0.05) with feeding BS-Y and BS-P than those of BS-M silages. However, the values of NPN and NH3 were taken the reflected trend with feeding BS- Y and BS-P compared to BS-M. The true protein 'nitrogen (TPN) was significantly decreased when fed BS-M compared with either BS-P or BS-Y at different times and also with overall mean. The microbial protein nitrogen (MPN) was decreased only after feeding BS-Y, however no significant (P<0.05) difference was found post feeding also among overall mean of the experimental diets in this respect.
Plasma constituents were increased (P<0.05) for total protein and glucose with added BS-Y and BS-P compared to BS-M group. Feeding BS-M, BS-Y or BS.P had no significant effects on the albumin, globulin albumin/globulin ratio. It is interest to observe that, feeding BS-P and BS-Y decreased significantly (P<0.05) urea nitrogen, aniline transaminase (ALT) and aspartate transaminase (AST) in serum compared with feeding BS-M. Milk production and fat corrected milk were increased significantly (P<0.05) when feeding BS-P and BS- Y compared to BS-M. However, fat, protein lactose, total solid and solid not fat were not significantly differed among experimental tested groups. ' In conclusion, these results indicated that added sweet potato tubers compared to use of either corn and EI-Mufeed as sources of energy for making berseem silage could improve silage quality and could narrow the gap between caloric and protein ratio. Also such situation could improve feed efficiency for lactating cows.
Keywords: Sweet potato, Berseem silage, Rumen fermentation, Digestibility, Feed intake, Blood parameters.
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| Publication year |
2004
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| Pages |
11-26
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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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| City |
المنصورة
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| serial title |
Journal of Agricultural Science Mansoura University
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| ISSN |
1110-0346
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| Author(s) from ARC |
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| Agris Categories |
Animal feeding
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AGROVOC
TERMS |
Digestibility.
Energy.
Feed intake.
Performance testing.
Rumen digestion.
Sweet potatoes.
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| Proposed Agrovoc |
Berseem silage;lactating cows;Blood parameters;
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| Publication Type |
Journal
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