Effects of different nutrition levels in total mixed rations on production performance, apparent digestibility, and slaughter performance in yard feeding lambs

Abstract

Abstract: The effects of three nutrition levels (A₁, 0.7×NRC, A₂, 0.8×NRC, A₃, 0.9×NRC) in total mixed rations on production performance, apparent digestibility and slaughter performance was evaluated. Forty-eight lambs [SA Mutton Merino(♂)×Gansu alpine fine wool sheep (♀)] were randomly divided into three groups for a two months feeding trial. The average daily weight gains of the A₂ and A₃ groups were significantly (P<0.01) higher than that of the A₁ group. There was no significant difference between A₂ and A₃. The average daily gain of ram lambs was significantly (P<0.01) higher than that of ewe lambs. Different nutrition levels had significant effects on apparent digestibility of Ca, total phosphorus (TP), neutral detergent fibre (NDF) and acid detergent fiber (ADF) (P<0.01). Sex factors had significant effects on apparent digestibility of Ca and TP (P<0.01). There were no difference in slaughter indexes (P>0.05) but the slaughter rate, cooking rate and loin eye area of hybrid lambs were significantly higher than those of Gansu alpine fine wool sheep. In summary, the 0.8×NRC nutritional level was better for fattening hybridized lambs of crossed SA Mutton Merinos, and ram lambs grew better than ewe lambs at the same nutritional levels.

CLC Number:

S826.4

MA You-ji, WANG Bao-yi, LI Fa-di, ZHAO You-zhang, HU Xiang. Effects of different nutrition levels in total mixed rations on production performance, apparent digestibility, and slaughter performance in yard feeding lambs[J]. Acta Prataculturae Sinica, 2012, 21(4): 252-258.

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