جستجوی مقالات مرتبط با کلیدواژه "sorghum silage" در نشریات گروه "علوم دام"

Corn silage is becoming one of the main popular feeds for dairy farms, but due to high water demand, sustainability of corn silage production is coming to be constraint. Sorghum has been considering alternative silage crop with significant forage production and lower water requirement. Therefore, this experiment was plant to replace corn silage by sorghum silage in the diet of dairy cows.

Sorghum (Speed feed Var.) and corn were planted (two hectares for each) and the forge obtained was ensiled separately. Four diets (treatments) contained 24 percent silage (DM basis) formulated in which corn silage replaced with 0.00, 33, 66 and 100% with sorghum silage. 32 lactating cows (average 44 days in milk) were divided into two blocks with average daily milk of 34.11 and 28.20 kg and then the cows of each block allocated to four experimental diets. Nutritive values of the diets adjusted to the requirements of cows in each block.

Average daily dry matter intake was not statistically affected by the experimental diets but the cows in high milk yield blocks consumed higher dry matter (p<0.05). The fresh milk and 3.5FCM yield did not affected by the treatments but the average milk yield was different between the blocks throughout the experiment. Feed efficiency based on the kg of milk yield per kg dry matter intake was not affected by the treatments and between the blocks as well. Milk compositions including fat, protein, lactose, solid non fat, total solid and milk urea nitrogen were not affected by the treatments but total saturated fatty acids were decreased by inclusion of sorghum silage in the diets (p<0.05).

In general, results showed that the corn silage could be replaced by sorghum silage (speed feed var.) in the diets of lactating cows (with daily milk yield about 30kg). However, due to the lower starch and lower energy content in sorghum silage than the corn silage, the diets should be supplemented with starch sources to compensate the energy balance, when use sorghum silage.

This study aimed to investigate the nutritive value and in vitro digestibility of the silage from five varieties of sorghum involving (ICRISAT623×R165, ICRISAT632×R165, ICRISAT625×165, ICRISAT520×166 and speed feed) in a completely randomized design with five replicates. The dry matter(DM) and crude protein(CP) yield of the sorghum varieties were determined and then were ensiled in plastic buckets. The difference between sorghum varieties was significant in terms of DM and CP content before ensiling. ICRISAT520 ×R166 had the highest DM and CP yield and Speed Feed cultivar had the lowest yield. The results showed that silage cultivars had a significant difference in chemical composition (P <0.05). ICRISAT625 ×R165 had the highest content of fat, water soluble carbohydrates (WSC), and metabolism energy (ME) and Speed Feed had the highest amount of acid detergent fiber (ADF) and ammonia nitrogen (NH3-N). There was a significant difference between 5 cultivars in estimating of dry matter digestibility (DMD), organic matter digestibility (OMD) and metabolizable energy (ME). DMD and OMD in silage of ICRISAT625×625 (57.71% and 54.17%) and ICRISAT625×623 (56.30% and 55.04%) were higher than the rest of the cultivars. The highest ME was observed in ICRISAT625×165(7/8 MJ/Kg) and ICRISAT623 ×R165 (7/6 MJ/Kg). Generally, in terms of fresh consumption ICRISAT520×166 is recommended for cultivating in Golestan province due to higher DM and CP production than other cultivars (18487 and 1400 kg ha-1 respectively), but ICRISAT625 × R165 variety of sorghum silage is superior to other cultivars in terms of ME.

The molasses and whey are byproduct. These are very beneficial as silage additive while increased silage nutritional value.
This study was carried out to determine the effects of adding molasses and whey on the chemical composition, quality characteristics and also degradability of sorghum silage by nylon bag technique.
Sorghum was harvested in flowering stage with an average %25 DM. Experiment was done with three treatments and four replications. Treatments were included: 1. sorghum silage without additives (control), 2 and 3. Sorghum silage with %10 molasses (molasses) and %10 whey (whey) respectively. The forage was ensiled in a plastic bucket and stored for 81 days.
The results showed that, in silages treated with molasses, dry matter, calcium, phosphorus and sodium significantly (P It is concluding that adding molasses to sorghum silage, increased some Chemical composition include DM, Ca, P and K and decreased NDF compared control and whey treatments. Using of additives improved quality of sorghum silage (decreasing of pH and N-NH3).

This experiment were conducted to study the effect of growth stage and silage process on chemical composion and dry matter digestibility. Therefore، the cultivation of sorghum growth stages (vegetative، bloom and seeding) was harvested. The chopped forage in bloom stage was used for ensiled. After opening the door of silo، sampling were taken from different parts. Samples (fresh and Silage) after drying، were grinded with 1 mm sieve size. Degradability of DM for fresh and silage sorghum was performed by nylon bags technique. The results showed that the DM، NDF and ADF increased with age increasing. Protein crude، crude fat and total tannins significantly reduced with growth progress (P<0. 05). The ash concentration was lower in flowering stage and higher in vegetative stage. Fraction “a” and “c” and effective degradability decreased as growth progress. Crude protein content of sorghum forage significantly increased compared to silage (P<0. 05). Tannin concentration in silage decreased significantly (P<0. 05) compared to sorghum forage. The results showed that degradability parameters of the fresh and silage forage were not significantly different.

This experiment carried out to determination of the chemical composition and nutritional value of sorghum silage ensiled by bucket or plastic bag. The chopped forage were ensiled in mini-silo for 81 days. To measurement of the degradation characteristics of dry matter, crude protein and NDF was used nylon bags and gas test method. The results showed that the crude protein and ammonia nitrogen in silage plastic was significantly greater than the silage bucket (P<0.05). Crude fat, ash, total and condensed tannins, NDF, ADF and pH were not significant difference between two treatment. The results of the degradation of dry matter, crude protein and NDF showed that part of rapid degradation (a) of crude protein and NDF of the silage buckets was significantly higher than plastic silage (P<0.05). The values of other parameters degradation, there were no significant differences in between the treatment. Results of gas test showed no significant difference between gas produced during the incubation different times. The overall results showed that the value nutritional of silages were similar in two methods.

This experiment carried out to determination of the chemical composition and degradability of sorghum silage at two maturity stage. Sorghum forage harvested at two maturity stage being vegetative and bloom. The chopped forages were ensiled in mini- silo for 81 days. The silages were tested for chemical composition and degradation characteristics of dry matter, crude protein and neutral detergent fiber. The nylon bags method was used for determination of the sorghum silage degradability. The results showed, with increasing maturity, content of crude protein (8.54 to 6.90 %DM), total tannins (1.48 to 0.18 %DM), water soluble carbohydrates (19.72 to 11.35 g/kg) and calcium (0.059 to 0.049 %DM) of sorghum silage significantly decreased (p < 0.05). The amount of neutral detergent fiber content (NDF), acid detergent fiber content (ADF), ether extract, ash, condensed tannins, sodium, phosphorus and potassium were not significantly different amongtreatments. The degradability of dry matter, crude protein and NDF increased with advancing maturity stage, but degradation parameters (section of quickly and slowly degradation) were not significantly different at two maturity stage. It is concluded, sorghum forage harvested at vegetative stage was more beneficial than the bloom stage for ensiling.

The chemical and fermentative parameters of three fresh forages and silages of sorghum including Sweet, Pegah and Speedfeed varieties were compared with corn using in vitro method, also degradability coefficients of forages and silages were determined by in situ method. Forages were planted in the same condition and harvested in soft dough stage, then ensilaged in four replicates for each time of 30, 60 and 90 days of preservation in mini silos. Buffering capacity in green Sweet sorghum was lower than corn and Speedfeed, and acid detergent fiber and water soluble carbohydrates respectively were significantly highest and lowest in fresh forage of Speedfeed sorghum. In time of 60 days, percent of acid detergent lignin of corn silage was lower than Sweet and Speedfeed sorghum silages; similarly, residual water soluble carbohydrate was lowest in corn silage. The lactate Concentration in corn and Pegah sorghums was higher than Sweet and Speedfeed silages. In corn and Sweet sorghum silages, Contents of acetic acid and ammonium nitrogen were highest and lowest, respectively. In nylon bag experiment, Degradation rate of corn and Pegah sorghum forages were significantly higher than Sweet and Speedfeed sorghums that cause to more effective degradability with passage rate of 0.08 in this forages. Also, the slowly degradation coefficient of corn silage was higher than sorghums silages. In conclusion, Speedfeed sorghum forage is not suitable for making silage in comparison others, and corn silage had more potential of degradability.