چكيده انگليسي :
The objective of this study was to investigate different levels of sugar cane bagasse pellets (SCBP) as diet forage source on ruminal total fermentation, chewing activity, lactation performance, nutritional intake and digestibility and dietary intake of lactating Shal ewes. In this experiment,30 lactating Shal ewes with body weight 63±8.59. were used in a completely random design with 3 experimental treatments and 10 replicate. treatments were: 1) diet containing 0% SCBP, 2) diet containing 12% SCBP and 3) diet containing 24% SCBP. diets forage sources were containing wheat Straw (WS), alfalfa (AH) or sugar cane bagasse pellets (pellets). was SCBP replaced AH And Diets were balanced on the basis of energy and protein. SCBP was containing 3.5% CP and 63.5% NDF. in terms of forages digestibility measure, DM degradability in SCBP in the early hours It was more compared to WS and AH but during incubation, the highest level of degradability was related to AH and the lowest was related to WS and degradability rate and degradability effective it was the highest in AH and the lowest in WS. in the NDF degradability in 0, 3, 6 and 12 h, was the highest in AH and the lowest in WS and at 48 h, WS was the highest and SCBP was the lowest and degradability rate and degradability effective it was the highest in AH. spectrum FTIR in cell wall compounds among the forages of WS, AH and SCBP: At the absorption peak (3336cm-1) the amount of absorption in this area in WS, 24 h was more than 0 h. In AH, 0 h was longer than 24 h, and in SCBP, 0 h was longer than 24 h. And among the forages at 0 h, AH was the most and at 24 h, WS was the most. degree of esterification(1728cm-1) in WS, 24 h was more than 0 h, in AH, 0 h was more than 24 h, and in SCBP, 24 h was more than 0 h, and among the forage at 0 h, AH and at 24 h, WS had the highest absorption. absorption band ratio 1367/2922 as an indicator of total crystallinity, in WS, 24 h was more than 0 h, in AH, 24 h was more than 0 h, and in SCBP, 0 h was more than 24 h, and among the forages, SCBP was the most at 0 h and at 24 h, WS was the most. Raw milk production, feed efficiency and milk composition were not affected by experimental treatments. Also, rumen pH and the molar percentage of acetate, butyrate, isobutyrate, valeric, isovaleric and ammoniacal nitrogen were not affected by different levels of SCBP, but the ratio of acetate to propionate decreased linearly with increasing levels of SCBP and the total concentration of volatile fatty acids and propionate It had a linear tendency to be significant. The use of SCBP in the diet decreased the feeding behavior pattern including eating time, rumination time and chewing time linearly (P<0.01) and vice versa, rest time increased linearly with increasing SCBP level in the diet (P<0.01). The dry matter consumption was not affected by the treatments. The digestibility of DM, OM and NDF was affected by the experimental treatments and increased with the increase of SCBP level in the diet (P<0.01). Addition of SCBP reduced the price per kilogram of dry matter and increased the income per ewe. The results of this experiment showed that replacing AH with different levels of SCBP in the ration of lactating ewes reduced the amount of chewing, but did not have a negative effect on their digestibility and performance, and therefore, considering the more economic efficiency, SCBP can be used in the diets of lactating ewes. Both energy and protein are suitable substitutes for AH.
