Effects Of Complete Pellet Diets With Different Nutrition Level On Fattening Of Early Weaning Lambs

Twenty-four crossbred lambs (Poll Dorest ♂×Tan　×Small　Tail　Han♀,50 days age) were divided into three groups and Single factor design was used to study effects of fattening diets with three nutritional levels (Ⅰ-0.9NRC, Ⅱ-1.0NRC and Ⅲ-1.1NRC). The results are shown as follows: Results from the feeding trial indicated that there were significant difference (P<0.05) between Ⅰand Ⅲon final weight of lambs, and no significant difference (P>0.05) occurred between Ⅱand Ⅲ, at the same time a tendency was showed that the weight of Ⅱwas higher than that of Ⅰ(P=0.10). There were no significant difference on ADG (Average Daily Gain) of lambs (P>0.05) between Ⅱand Ⅲ, it was also proved that ADG of Ⅰwas significant lower than that of others (P<0.05). There was a tendency that Ⅰwas higher than Ⅱon PER (Protein Efficiency Ratio) of lambs, and that of Ⅱwas significant higher than Ⅲ(P<0.05) and Ⅰwas very significant higher than that of Ⅲ(P<0.01). ). No significant difference on DM (Dry Matter) intake, FCR (Food Conversion Rate) and DEI/ADG (Digestible Energy Intake/ Digestible Energy Intake) were indicated among three groups (P>0.05). Results from the digestion trial displayed that there were no significant difference on DMD (Dry Matter Digestion coefficient), OMD (Organic Matter Digestion coefficient), CaD (Calcium Digestion coefficient) and TPD(Total Phosphorus Digestion coefficient) (P>0.05) between Ⅰand Ⅱ, the CPD (Crude Protein Digestion coefficient) of Ⅱwas very significant higher than that of group Ⅰ(P<0.01), and the ADFD (Acid Detergent Fiber Digestion coefficient) of Ⅱwas significant higher than that of Ⅰ(P<0.05). The DMD, OMD, CPD, ADFD and CaD of group Ⅲwere very significant higher than that of group Ⅰ(P<0.01), and the TPD (Total Phosphorus Digestion coefficient) of Ⅲwas significant higher than that of Ⅰ(P<0.05). The DMD, CPD and CaD of Ⅲwere very significant higher than that of Ⅱ(P<0.01), and the OMD and ADFD of Ⅲwere significant higher than that of Ⅱ(P<0.05), there was no significant difference on TPD between Ⅲand Ⅱ(P>0.05). Results from the slaughter experiment showed that there was no significant on carcass weight (P>0.05) between Ⅱand Ⅰor Ⅲ, but there was a tendency that Ⅱwas higher than Ⅰa nd lower than Ⅲ(P=0.18 and P=0.34), and carcass weight of Ⅲwas significant higher than that of Ⅰ(P<0.05). Expect there were higher tendency on the net yield of meat of Ⅲthan that of Ⅰand Ⅱ(P=0.07 and P=0.07), it were not observed there were significant difference among three on slaughtering rate and net yield of meat (P>0.05).The GR value between Ⅰand Ⅱwas no significant difference (P>0.05), but that of Ⅲwas a higher tendency than Ⅱ(P=0.06), and higher significant difference than Ⅰ(P<0.05). Expect the water loss on Ⅱwas significant higher than that of Ⅰ, difference of lamb meat quality among three were no significant (P>0.05). Results indicated that the percent of rumen and reticulum (% the fresh weight of stomach) on Ⅱwas a tendency higher than that of Ⅰand lower than that of group Ⅲ(P=0.12, P=0.16), at the same time that of Ⅲwas very significant higher than that of Ⅰ(P<0.01). There was no significant difference on the percent of abomasum (% the weight of stomach) among groups (P>0.05), so did the percent of stomach, small instestine and large instestine (% the weight of gastrointestinal tract). It can be showed there was higher economic effect on Ⅱand Ⅲthan Ⅰ. Income of Ⅱand Ⅲwere 135.46% and 130.83% as high as income of Ⅰ. In a word, people will get much benefit if complete diet pellet with 1.0×NRC level is used to fatten early weaning (one month age) crossbred lambs.