The Effect Of Feeding Straw Pelletized Diets On Growth Performance And Rumen Development In Fattening Lambs

Dividing24healthy Small Tail Han lambs about3months ages into4groups andeach group has6lambs. Each of the group was feeding on corn straw with directedshattering (control group),directed pelleting (trial groupⅠ),straw and alfalfa mealmixed pelleting (trial groupⅡ), total mixed pelleting (trial groupⅢ).Adaptationperiod is15days and experiment period is50days. The results showed as follows:(1)The ending of the feed experiment each group’s weight is groupⅢ>groupⅡ>groupⅠ>control group(P>0.05);net gain and ADG isgroupⅢ>groupⅡ>group Ⅰ>control group, groupⅢ and groupⅡ are significantlyhigher than control group(P<0.05).DMI is group Ⅲ> group Ⅰ>controlgroup>groupⅡ(P>0.05).F/G is groupⅡ <groupⅢ <control group<group Ⅰ, groupⅢand groupⅡ are significantly lower than groupⅠ and control group(P<0.05).(2)During the feed experiment, body height’s gaining is control group>groupⅢ>groupⅠ>groupⅡ(P>0.05).Body length’s gaining is groupⅢ> group Ⅰ> groupⅡ>control group(P>0.05). Chest circumference’s gaining is groupⅢ>control group>groupⅠ>groupⅡ,groupⅢ is significantly higher than groupⅡ(P<0.05).Chestdepth’s gaining is groupⅢ>control group>group Ⅱ> groupⅠ,groupⅢ is significantlyhigher than groupⅡ and groupⅠ(P<0.05).(3)About blood biochemical indexes in the ending of the feed experiment, TP isgroupⅢ>groupⅡ>control group>groupⅠ, groupⅢ is significantly higher thangroupⅡ（P<0.05）.A/G is groupⅢ <groupⅠ <control group<groupⅡ(P>0.05).GLU iscontrol group>groupⅢ>groupⅠ>groupⅡ(P>0.05).BUN is groupⅢ <control group<groupⅠ <groupⅡ,groupⅢ and control group are significantly lower thangroupⅠ and groupⅡ(P<0.05).(4)On the laughter performance, carcass weight isgroupⅢ>groupⅡ>group Ⅰ>control group, groupⅢ is significantly higher thancontrol group(P<0.05).Dressing percentage is group Ⅲ> groupⅡ>controlgroup>groupⅠ,groupⅢ is significantly higher than control group and groupⅠ(P<0.05).Eye muscle area is groupⅢ>groupⅡ> group Ⅰ>controlgroup(P>0.05).Meat dehydration rate is group Ⅰ<group Ⅱ<groupⅢ <controlgroup(P>0.05).Shearing force is groupⅢ <groupⅡ<groupⅠ <control group(P>0.05).(5)Rumen’s weight and total complex stomach’s weight are groupⅡ>controlgroup>groupⅠ>groupⅢ(P>0.05), The percentage rate is controlgroup>groupⅡ>groupⅢ>groupⅠ(P>0.05).The rumen mucosa nipple’s length isgroupⅢ>groupⅠ>group Ⅱ>control group(P>0.05).The rumen mucosa nipple’s widthis groupⅡ>groupⅢ=control group>groupⅠ(P>0.05).The rumen mucosa wall’sthickness is groupⅢ>groupⅠ>control group>group Ⅱ, groupⅢ is significantlyhigher than other3groups(P<0.05).Comparing above the indexes trial group Ⅲ’ s processing mode--that is totalmixed pelleting with corn straw and alfalfa and concentrate feed daily ration is moreapplicable in fattening lambs, and this daily ration has no harmful effect on thedevelopment of rumen.