Studies On Energy And Protein Requirements Of Mixtus Sheep And Fatting Lambs

Experiments were conducted to test different nutrition level of energy,rumen degradable protein and undegradable protein requirements of crossing sheep during the period of growing and in the last two months of pregnancy and in the first month of lactation by feeding trial,digestion and determination of feed degradation in rumen.Select 72 pregnancy F3 ewes (52.58+5.87kg) of German merino sheep x Hebei fine wool sheep were divided into nine groups of each 8 and no significance of difference(P>0.05) each group during the last two month of pregnancy,and respectively fed with nine kinds of diets which were composed of 3 levels of energy and protein(120%,100%,80% of NRC(1985) recommending requirement).Group I was fed high energy and protein,group II was fed moderate energy and high protein,group LI was low energy and high protein,group IV was high energy and moderate protein,group V was moderate energy and moderate protein,group A/I was low energy and moderate protein,group VII was high energy and low protein,group VDI was moderate energy and low protein,group IX was low energy and low protein.The result showed that sheep weight of group I was fast and the average daily gain was 195.83 + 16.67g and the birth weight of lamb was 4.88+0.3lkg.The appropriate ME,CP,RDP and UDP intake of ewes during later pregnancy was 0.85 MJ/kgW0.75 9.15g/kgW0.75 3.99g/kgW0.75 and 5.16g/kgW0.75 on this condition.The sheep of individual made the adjustment under a basic and constant circumstance during lactation.The sheep were divided into nine groups of each 7 and significance c-f difference(P>0.05) each group.The results showed that the weight of group III added a. little(0,43 + 3.69kg/head) and surplus groups all lost but no significance c-f difference(P>0.05). The highest of the average daily gain of lamb was group II with 222.50+ 10.40g and the highest of the milk yield was group II with0.95+0.12kg/head d. The appropriate ME,RDP and UDP intake of ewes during lactation was 1.18MJ/kgW0.75 13.59g/kgW0.75 6.45g/kgW0.75 7.14g/kgW0.75 on this condition.Select 40 F4 lambs (29.8+1.9kg,5 months) of German Merion sheep x Heibei fine wool sheep were divided into four groups(P>0.05),were feeded Naked oats and different nutritional level of the same feed in order to study effect on production performance by different nutritional level.Control group was fed 250g Naked oats and each experimental groups was respectively fed 150g,250g,350g same feed everyday.The result showed that daily gain was improved significant by feeding 0.35kg with grazing and economic benef was significant(pure earning was 69.16 yuan/head).Feeding Naked oats can increased production performance to seed of male and daily gain achieved 270.00+43.01kg.The apparent digest rate of energy and N of 2rd grope on feeding 0.25kg wan higest(65.78% and 73.16%).The appropriate DE and CP intake of fatting lamb during grazing was 1.02 MJ/kgW0.75,17.48 g/kgW0.75.