EFFECT OF USING DIFFERENT SOURSES OF DIETARY ENERGY FOR MAKING BERSEEM SILAGE ON PERFORMANCE OF LACTATING COWS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 1, Volume 29, Issue 1, January 2004, Page 11-26 PDF (199.31 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2004.238983 | ||||
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| Authors | ||||
| F. M. A. Abo-Donia,; U. A. EI-Zalaki; A. Aiad; G. H. Zaza | ||||
| Animal Production Research Institute, Ministry of Agriculture, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| Eighteen crossbreed Friesian cows in the 2"4_3<11 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. 2nd ,iroup < /sup> received a diet containing CFM + silage with yellow com + rice straw and the 3 group received a diet containing CFM + silage with chips of sweet potato + rice straw. The diets were formulated to be iso-caloric and rso- nitrogenous according to NRC (1988). The tests 0 f silages indicate that, pH values, NFA'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 glh/d 0 f 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 NOF, hemicellulose and TON 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 NFA'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 ware not affected significantly when feeding different types of berseem silage. On 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<O.OS) with feeding BS- Y and BS·P than those of BS-M silages. However, the values of NPN and NHJ 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 8S- 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<O.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 8S-Y and BS-P compared to BS-M group. Feeding 8S-M, 8S-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 (AL T) 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 silages; rumen fermentation; Digestibility; Feed intake; Blood parameters | ||||
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