Studies On Fatting Performance Of Different Hybrid Lambs Fed Total Mixed Ration

This experiment use24Dorset（♂）×Small Tailed Han Sheep（♀） lambs and24Doper（♂）×（Dorset（♂）×Small Tailed Han Sheep（♀））（♀）F1lambs （3month old,initial weight24.18±3.42kg）, with the3×2×2factor design to investigate the effect ofdifferent nutrition level（A factor, A1-1.0×NRC, A2-0.9×NRC and A3-0.8×NRC）,genetic background（B factor, B1-Dorset（♂）×Small Tailed Han Sheep（♀） and B2-Doper（♂）×（Dorset（♂）×Small Tailed Han Sheep（♀））（♀）F1lambs） and sex（C factor,C1-male and C2-female） on growth performance, eating behaviour and economicbenefit. The trial period is60days and the transition period is15days. The resultshowed that A1have very significantly higher final weight and average dailygain（P<0.01） and very significantly lower F/G（P<0.01） than A₂and A₃, but there areno significant difference between A₂and A₃（P>0.05）; B₁have very significantly loweraverage daily gain（P<0.01） and very significantly higher F/G（P<0.01） than B₂; C₁have very significantly higher average daily gain and significantly lower F/G thanC2（P<0.05）. With the descending of nutrition level, chewing times for every bolussignificantly ascending（P<0.05）; B1have very significantly lower ruminant time thanB2（P<0.01）. CPD、 CaD and TPD of A₁were very significantly higher thanA3（P<0.05）. A₂had very significantly ADFD than A₃（P<0.05）. A1had verysignificantly higher Propionic acid proportionand very significantly lower pH andacetic acid/Propionic acid than A2and A3（P<0.05）. DMD、CPD、CaD、TPD、ADFDå’ŒNDFD of B1were very significantly lower than B₂（P<0.05）. Based on economicbenefit analyzing, A1have very significantly higher net income than A₂and A₃, butthere are no significant difference between A₂and A₃（P>0.05）, feed cost significantlyreducing as the nutrition level descending; B₁have significantly lower feedcost（P<0.05） and very significantly net income（P<0.05） than B₂. The net income ofC1was very significantly higher than C₂（P<0.01）.All this suggests that performance and economic benefit ofDoper（♂）×（Dorset（♂）×Small Tailed Han Sheep（♀））（♀）F1lambs were better thanDorset（♂）×Small Tailed Han Sheep（♀） lambs; male lambs have better growth performance and economic benefit than female lambs; lambs with1.0×NRC hadhigher CPD, CaD and TPD, could obtain the best growth performance and economicbenefit.