The Effects Of Stalk-additives And Pelletization On Availability Of Cotton Stalk Diet By Sheep

Trail1: Chemical analysis and cumulative gas production technique in vitro were applied to evaluated the nutrient of different part of cotton stalk and to appraise the effects of six different treatments. The result showed: CP content of logn feed, main stem, branch stem , cotton hulls and cotton leaves was 5.67%, 4.55%, 6.16%, 5.38% and 11.85%, respectively. Cellulose's content was 46.06%, 47.01%, 42.46%, 41.95% and 17.76%, respectively. Hemicelluloses' content was 6.36%, 10.61%, 8.56%, 3.98% and 11.62%, respectively. Lignin's content was 17.18%, 19.78%, 16.11%, 13.01% and 11.66%, respectively. 24-hour's cumulative gas production was 341.8, 297.6, 375.4, 292.5 and 450g/5gDM, respectively. and 65℃ DM disappearance rat after fermentation was 26.98%, 22.49%, 29.85%, 24.12% and 39.4%s, respectively. After treating cotton stalk with 5%Urea, microorganism, recombination, 1%AHP immersion , 0.1%AHP spray and 60% water, only 1%AHP immersion treatmemt could significantly reduce the content of Lignin(p<0.01), and increase significantly 36 hours' cumulative gas production(p<0.05).Trail2: 18 healthy Duolang sheep of 35.72±7.75kg were used in the digestion and metabolism test. Under the condition that the ration of concentrate to cotton stsalk was 12:85, compared the effects of stalk-additives and pelletization on availability of cotton stalk diet by sheep(Duo Lang sheep). The result showed that : The average DMI of BDG, SAG and PG was 1006±234, 1126±172 and 1543±308g/d, respectively. DMD was 50.4±3.1%, 50.3±2.0% and 45.9±2.3%, respectively. CPI was 89.8±19.8%, 125.4±18.6% and 165.5±33.2g/d, respectively. CPD was 42.6±5.0%, 55.3±3.2% and 48.6±3.0%, respectively. Deposition of CP was 12.9±6.6, 21.8±4.5 and 26.9±5.5g/d, respectively. HCD was 64.3±5.5%, 62.1±5.1% and 53.1±4.7%, respectively. CED was 42.1±3.0%, 41.7±3.1% and 37.9±2.8%, respectively. ED was 48.0±3.5%, 48.3±2.1% and 43.3±2.8%, respectively. All were significiantly increased (p<0.05) except that DMD, HCD, CED and ED have no significiant difference (p>0.05) compared with BDG's. PG' DMI and CPI were significiantly increased (p<0.05), compared with SAG's, meanwhile, DMD, HCD CED and ED were significiantly decreased (p<0.05). Ca's and P' intake of BDG's was 11.51±2.72 and 2.49±0.53g/d, respectively. Apperance digestibility was 8.3±3.7% and 12.3±9.2%, respcetively, and deposition was 0.87±0.59 and 0.3±0.28, respcetively. The apparent digestibility and deposition of SAG' Ca and P were 167%, 104%, 2.33g and 0.65g higher than BDG's, respcetively (p<0.01). Mean while, the intake of PG's Ca and P were much more 8.16g(p<0.05) and 1.17g(p>.05) than SAG's, respectively, and the apparent digestibility and deposition of PG's Ca and P decreased a little (P>0.05) compared with SAG's except that Ca's deposition increased 1.16g(p>0.05). Body weight gain per day was 117±57, 127±44 and 224±32g/d, respectively, PG's body weight gain per day was more 97g than SAG' (p<0.01). The DE of cotton straw for sheep is 1.70Mcal/kgDM.