Effects Of Fattening Modes On Fattening Performance And Meat Quality Of Hulun Buir Lambs And F1Hybrid Lambs Between Hulun Buir Sheep And Dorper Sheep

The effects of faucning mode on fattening performance and slaughter performance and meat quality of Hulun Buir lambs and F1Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep was discussed in this study. The results provided a scientific basis for the fattening program of Hulun Buir lambs.This paper included three parts. Experiment one was conducted to study the effects of fattening modes on fattening performance of Hulun Buir lambs. Sixty four-month of weaning male and female Hulun Buir lambs were respectively selected as experimental animals, and divided into four groups. The2×2factorial arrangement was used, and the first factor was fattening mode, divided into natural grazing and grazing feeding with supplementation, the second factor was sex including male lambs and female lambs, The fattening period last for60days, devided into early stage of fattening (1-30d) and the late stage of fattening (31-60d).Experiment two was conducted to study the effects of fattening modes on fattening performance and slaughter performance of male lambs of Hulun Buir lambs and F1Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep. The2×2factorial arrangement was used, and the first factor was fattening mode, divided into natural grazing and grazing feeding with supplementation, the second factor was variety including Hulun Buir lambs and Fl Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep. Sixty four-month of weaning male lambs of Hulun Buir lambs similar to those of the experiment one in weight, body condition and F1Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep were selected respectively from the original feeding farm, and divided into four groups, thirty lambs of each group.The fattening period last for60days, devided into early stage of fattening (1-30d) and the late stage of fattening (31-60d).At the end of the experiment one and experiment two,5male lambs (fasting24h, water deprivation2h) of close to the average weight were selected from the grazing feeding with supplementation group and natural grazing group respectively to slaughter, for determination of slaughter performance.Experiment three was conducted to study the effects of different fattening modes on meat physicochemical properties and nutritional value of male lambs of Hulun Buir and Fl Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep. The experimental design was the same to the experiment two. The slaughtered lambs of the experiment two were determined the meat quality indicators and nutrition facts.Under the condition of this experiment, the study indicated:(1) Grazing feeding with supplementation could significantly increase the fattening performance of Hulun Buir lambs, the lambs market weight could be reached39.37kg, and the weight and daily weight gain increased by67.03%and38.46%compared to the natural grazing group.(2) Grazing feeding with supplementation could significantly increase the slaughter performance of the male lambs, and carcass weight, dressing percentage, the meat weight, meat percentage and omental fat weight were increased by21.45%,12.62%,29.06%,17.77%,58.33%compared to the natural grazing group.(3) Throughout the fattening stage, body weight of the male lambs of the F1Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep were significantly higher than Hulun Buir male lambs, and the gained weight for male lambs of the Fl Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep was8.93kg, and8.07kg for Hulun Buir male lambs. The carcass weight, dressing percentage, meat weight, meat percentage, kidney fat weight and loin eye area of the male lambs of the Fl Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep increased by35.73%,5.35%,38.70%,6.61%,50.00%and29.22%compared to the Hulun Buir male lambs.(4)The feeding with supplementation had not significant impact on the meat quality of the male lambs for grazing feeding with supplementation compared to natural grazing(P>0.05), but in value the marble, pH1, shear force, water loss rate and conductivity for natural grazing with supplementation were slightly lower than those for grazing feeding with supplementation, and the cooked rate had the opposite result. Meat color, marbling, pHl, the shear force value, conductivity, CP, Ca and P levels of the male lambs of the Fl Hybrid Lambs between Hulun Buir Sheep and Dorper Sheep were slightly higher than the Hulun Buir male lambs, but the differences were not significant (P>0.05).(5) The amount of concentrates supplemented to Hulun Buir weaned lambs for grazing feeding with supplementation at early stage of fattening was0.27kg/d each lamb, at the late stage of fattening was0.53kg/d each lamb. The daily intake of every lamb per kg of metabolism weight in DE, CP, Ca and P were2.04MJ,3.49g,0.04g and0.12g at early stage of fattening and3.92MJ,7.07g,0.15g and0.24g at the late stage of fattening respectively. (6) Grazing feeding with supplementation could significantly promote the economic benefits of lambs, and the profit of each lamb of grazing feeding with supplementation increased198.68yuan than each lamb of natural grazing feeding.